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jdk/src/hotspot/cpu/riscv/c2_MacroAssembler_riscv.cpp

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/*
* Copyright (c) 2020, 2022, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2020, 2022, Huawei Technologies Co., Ltd. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#include "asm/assembler.hpp"
#include "asm/assembler.inline.hpp"
#include "opto/c2_MacroAssembler.hpp"
#include "opto/intrinsicnode.hpp"
#include "opto/output.hpp"
#include "opto/subnode.hpp"
#include "runtime/stubRoutines.hpp"
#ifdef PRODUCT
#define BLOCK_COMMENT(str) /* nothing */
#define STOP(error) stop(error)
#else
#define BLOCK_COMMENT(str) block_comment(str)
#define STOP(error) block_comment(error); stop(error)
#endif
#define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
// short string
// StringUTF16.indexOfChar
// StringLatin1.indexOfChar
void C2_MacroAssembler::string_indexof_char_short(Register str1, Register cnt1,
Register ch, Register result,
bool isL)
{
Register ch1 = t0;
Register index = t1;
BLOCK_COMMENT("string_indexof_char_short {");
Label LOOP, LOOP1, LOOP4, LOOP8;
Label MATCH, MATCH1, MATCH2, MATCH3,
MATCH4, MATCH5, MATCH6, MATCH7, NOMATCH;
mv(result, -1);
mv(index, zr);
bind(LOOP);
addi(t0, index, 8);
ble(t0, cnt1, LOOP8);
addi(t0, index, 4);
ble(t0, cnt1, LOOP4);
j(LOOP1);
bind(LOOP8);
isL ? lbu(ch1, Address(str1, 0)) : lhu(ch1, Address(str1, 0));
beq(ch, ch1, MATCH);
isL ? lbu(ch1, Address(str1, 1)) : lhu(ch1, Address(str1, 2));
beq(ch, ch1, MATCH1);
isL ? lbu(ch1, Address(str1, 2)) : lhu(ch1, Address(str1, 4));
beq(ch, ch1, MATCH2);
isL ? lbu(ch1, Address(str1, 3)) : lhu(ch1, Address(str1, 6));
beq(ch, ch1, MATCH3);
isL ? lbu(ch1, Address(str1, 4)) : lhu(ch1, Address(str1, 8));
beq(ch, ch1, MATCH4);
isL ? lbu(ch1, Address(str1, 5)) : lhu(ch1, Address(str1, 10));
beq(ch, ch1, MATCH5);
isL ? lbu(ch1, Address(str1, 6)) : lhu(ch1, Address(str1, 12));
beq(ch, ch1, MATCH6);
isL ? lbu(ch1, Address(str1, 7)) : lhu(ch1, Address(str1, 14));
beq(ch, ch1, MATCH7);
addi(index, index, 8);
addi(str1, str1, isL ? 8 : 16);
blt(index, cnt1, LOOP);
j(NOMATCH);
bind(LOOP4);
isL ? lbu(ch1, Address(str1, 0)) : lhu(ch1, Address(str1, 0));
beq(ch, ch1, MATCH);
isL ? lbu(ch1, Address(str1, 1)) : lhu(ch1, Address(str1, 2));
beq(ch, ch1, MATCH1);
isL ? lbu(ch1, Address(str1, 2)) : lhu(ch1, Address(str1, 4));
beq(ch, ch1, MATCH2);
isL ? lbu(ch1, Address(str1, 3)) : lhu(ch1, Address(str1, 6));
beq(ch, ch1, MATCH3);
addi(index, index, 4);
addi(str1, str1, isL ? 4 : 8);
bge(index, cnt1, NOMATCH);
bind(LOOP1);
isL ? lbu(ch1, Address(str1)) : lhu(ch1, Address(str1));
beq(ch, ch1, MATCH);
addi(index, index, 1);
addi(str1, str1, isL ? 1 : 2);
blt(index, cnt1, LOOP1);
j(NOMATCH);
bind(MATCH1);
addi(index, index, 1);
j(MATCH);
bind(MATCH2);
addi(index, index, 2);
j(MATCH);
bind(MATCH3);
addi(index, index, 3);
j(MATCH);
bind(MATCH4);
addi(index, index, 4);
j(MATCH);
bind(MATCH5);
addi(index, index, 5);
j(MATCH);
bind(MATCH6);
addi(index, index, 6);
j(MATCH);
bind(MATCH7);
addi(index, index, 7);
bind(MATCH);
mv(result, index);
bind(NOMATCH);
BLOCK_COMMENT("} string_indexof_char_short");
}
// StringUTF16.indexOfChar
// StringLatin1.indexOfChar
void C2_MacroAssembler::string_indexof_char(Register str1, Register cnt1,
Register ch, Register result,
Register tmp1, Register tmp2,
Register tmp3, Register tmp4,
bool isL)
{
Label CH1_LOOP, HIT, NOMATCH, DONE, DO_LONG;
Register ch1 = t0;
Register orig_cnt = t1;
Register mask1 = tmp3;
Register mask2 = tmp2;
Register match_mask = tmp1;
Register trailing_char = tmp4;
Register unaligned_elems = tmp4;
BLOCK_COMMENT("string_indexof_char {");
beqz(cnt1, NOMATCH);
addi(t0, cnt1, isL ? -32 : -16);
bgtz(t0, DO_LONG);
string_indexof_char_short(str1, cnt1, ch, result, isL);
j(DONE);
bind(DO_LONG);
mv(orig_cnt, cnt1);
if (AvoidUnalignedAccesses) {
Label ALIGNED;
andi(unaligned_elems, str1, 0x7);
beqz(unaligned_elems, ALIGNED);
sub(unaligned_elems, unaligned_elems, 8);
neg(unaligned_elems, unaligned_elems);
if (!isL) {
srli(unaligned_elems, unaligned_elems, 1);
}
// do unaligned part per element
string_indexof_char_short(str1, unaligned_elems, ch, result, isL);
bgez(result, DONE);
mv(orig_cnt, cnt1);
sub(cnt1, cnt1, unaligned_elems);
bind(ALIGNED);
}
// duplicate ch
if (isL) {
slli(ch1, ch, 8);
orr(ch, ch1, ch);
}
slli(ch1, ch, 16);
orr(ch, ch1, ch);
slli(ch1, ch, 32);
orr(ch, ch1, ch);
if (!isL) {
slli(cnt1, cnt1, 1);
}
uint64_t mask0101 = UCONST64(0x0101010101010101);
uint64_t mask0001 = UCONST64(0x0001000100010001);
mv(mask1, isL ? mask0101 : mask0001);
uint64_t mask7f7f = UCONST64(0x7f7f7f7f7f7f7f7f);
uint64_t mask7fff = UCONST64(0x7fff7fff7fff7fff);
mv(mask2, isL ? mask7f7f : mask7fff);
bind(CH1_LOOP);
ld(ch1, Address(str1));
addi(str1, str1, 8);
addi(cnt1, cnt1, -8);
compute_match_mask(ch1, ch, match_mask, mask1, mask2);
bnez(match_mask, HIT);
bgtz(cnt1, CH1_LOOP);
j(NOMATCH);
bind(HIT);
ctzc_bit(trailing_char, match_mask, isL, ch1, result);
srli(trailing_char, trailing_char, 3);
addi(cnt1, cnt1, 8);
ble(cnt1, trailing_char, NOMATCH);
// match case
if (!isL) {
srli(cnt1, cnt1, 1);
srli(trailing_char, trailing_char, 1);
}
sub(result, orig_cnt, cnt1);
add(result, result, trailing_char);
j(DONE);
bind(NOMATCH);
mv(result, -1);
bind(DONE);
BLOCK_COMMENT("} string_indexof_char");
}
typedef void (MacroAssembler::* load_chr_insn)(Register rd, const Address &adr, Register temp);
void C2_MacroAssembler::emit_entry_barrier_stub(C2EntryBarrierStub* stub) {
// make guard value 4-byte aligned so that it can be accessed by atomic instructions on riscv
int alignment_bytes = align(4);
bind(stub->slow_path());
int32_t _offset = 0;
movptr_with_offset(t0, StubRoutines::riscv::method_entry_barrier(), _offset);
jalr(ra, t0, _offset);
j(stub->continuation());
bind(stub->guard());
relocate(entry_guard_Relocation::spec());
assert_alignment(pc());
emit_int32(0); // nmethod guard value
// make sure the stub with a fixed code size
if (alignment_bytes == 2) {
assert(UseRVC, "bad alignment");
c_nop();
} else {
assert(alignment_bytes == 0, "bad alignment");
nop();
}
}
int C2_MacroAssembler::entry_barrier_stub_size() {
return 8 * 4 + 4; // 4 bytes for alignment margin
}
// Search for needle in haystack and return index or -1
// x10: result
// x11: haystack
// x12: haystack_len
// x13: needle
// x14: needle_len
void C2_MacroAssembler::string_indexof(Register haystack, Register needle,
Register haystack_len, Register needle_len,
Register tmp1, Register tmp2,
Register tmp3, Register tmp4,
Register tmp5, Register tmp6,
Register result, int ae)
{
assert(ae != StrIntrinsicNode::LU, "Invalid encoding");
Label LINEARSEARCH, LINEARSTUB, DONE, NOMATCH;
Register ch1 = t0;
Register ch2 = t1;
Register nlen_tmp = tmp1; // needle len tmp
Register hlen_tmp = tmp2; // haystack len tmp
Register result_tmp = tmp4;
bool isLL = ae == StrIntrinsicNode::LL;
bool needle_isL = ae == StrIntrinsicNode::LL || ae == StrIntrinsicNode::UL;
bool haystack_isL = ae == StrIntrinsicNode::LL || ae == StrIntrinsicNode::LU;
int needle_chr_shift = needle_isL ? 0 : 1;
int haystack_chr_shift = haystack_isL ? 0 : 1;
int needle_chr_size = needle_isL ? 1 : 2;
int haystack_chr_size = haystack_isL ? 1 : 2;
load_chr_insn needle_load_1chr = needle_isL ? (load_chr_insn)&MacroAssembler::lbu :
(load_chr_insn)&MacroAssembler::lhu;
load_chr_insn haystack_load_1chr = haystack_isL ? (load_chr_insn)&MacroAssembler::lbu :
(load_chr_insn)&MacroAssembler::lhu;
BLOCK_COMMENT("string_indexof {");
// Note, inline_string_indexOf() generates checks:
// if (pattern.count > src.count) return -1;
// if (pattern.count == 0) return 0;
// We have two strings, a source string in haystack, haystack_len and a pattern string
// in needle, needle_len. Find the first occurrence of pattern in source or return -1.
// For larger pattern and source we use a simplified Boyer Moore algorithm.
// With a small pattern and source we use linear scan.
// needle_len >=8 && needle_len < 256 && needle_len < haystack_len/4, use bmh algorithm.
sub(result_tmp, haystack_len, needle_len);
// needle_len < 8, use linear scan
sub(t0, needle_len, 8);
bltz(t0, LINEARSEARCH);
// needle_len >= 256, use linear scan
sub(t0, needle_len, 256);
bgez(t0, LINEARSTUB);
// needle_len >= haystack_len/4, use linear scan
srli(t0, haystack_len, 2);
bge(needle_len, t0, LINEARSTUB);
// Boyer-Moore-Horspool introduction:
// The Boyer Moore alogorithm is based on the description here:-
//
// http://en.wikipedia.org/wiki/Boyer%E2%80%93Moore_string_search_algorithm
//
// This describes and algorithm with 2 shift rules. The 'Bad Character' rule
// and the 'Good Suffix' rule.
//
// These rules are essentially heuristics for how far we can shift the
// pattern along the search string.
//
// The implementation here uses the 'Bad Character' rule only because of the
// complexity of initialisation for the 'Good Suffix' rule.
//
// This is also known as the Boyer-Moore-Horspool algorithm:
//
// http://en.wikipedia.org/wiki/Boyer-Moore-Horspool_algorithm
//
// #define ASIZE 256
//
// int bm(unsigned char *pattern, int m, unsigned char *src, int n) {
// int i, j;
// unsigned c;
// unsigned char bc[ASIZE];
//
// /* Preprocessing */
// for (i = 0; i < ASIZE; ++i)
// bc[i] = m;
// for (i = 0; i < m - 1; ) {
// c = pattern[i];
// ++i;
// // c < 256 for Latin1 string, so, no need for branch
// #ifdef PATTERN_STRING_IS_LATIN1
// bc[c] = m - i;
// #else
// if (c < ASIZE) bc[c] = m - i;
// #endif
// }
//
// /* Searching */
// j = 0;
// while (j <= n - m) {
// c = src[i+j];
// if (pattern[m-1] == c)
// int k;
// for (k = m - 2; k >= 0 && pattern[k] == src[k + j]; --k);
// if (k < 0) return j;
// // c < 256 for Latin1 string, so, no need for branch
// #ifdef SOURCE_STRING_IS_LATIN1_AND_PATTERN_STRING_IS_LATIN1
// // LL case: (c< 256) always true. Remove branch
// j += bc[pattern[j+m-1]];
// #endif
// #ifdef SOURCE_STRING_IS_UTF_AND_PATTERN_STRING_IS_UTF
// // UU case: need if (c<ASIZE) check. Skip 1 character if not.
// if (c < ASIZE)
// j += bc[pattern[j+m-1]];
// else
// j += 1
// #endif
// #ifdef SOURCE_IS_UTF_AND_PATTERN_IS_LATIN1
// // UL case: need if (c<ASIZE) check. Skip <pattern length> if not.
// if (c < ASIZE)
// j += bc[pattern[j+m-1]];
// else
// j += m
// #endif
// }
// return -1;
// }
// temp register:t0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, result
Label BCLOOP, BCSKIP, BMLOOPSTR2, BMLOOPSTR1, BMSKIP, BMADV, BMMATCH,
BMLOOPSTR1_LASTCMP, BMLOOPSTR1_CMP, BMLOOPSTR1_AFTER_LOAD, BM_INIT_LOOP;
Register haystack_end = haystack_len;
Register skipch = tmp2;
// pattern length is >=8, so, we can read at least 1 register for cases when
// UTF->Latin1 conversion is not needed(8 LL or 4UU) and half register for
// UL case. We'll re-read last character in inner pre-loop code to have
// single outer pre-loop load
const int firstStep = isLL ? 7 : 3;
const int ASIZE = 256;
const int STORE_BYTES = 8; // 8 bytes stored per instruction(sd)
sub(sp, sp, ASIZE);
// init BC offset table with default value: needle_len
slli(t0, needle_len, 8);
orr(t0, t0, needle_len); // [63...16][needle_len][needle_len]
slli(tmp1, t0, 16);
orr(t0, tmp1, t0); // [63...32][needle_len][needle_len][needle_len][needle_len]
slli(tmp1, t0, 32);
orr(tmp5, tmp1, t0); // tmp5: 8 elements [needle_len]
mv(ch1, sp); // ch1 is t0
mv(tmp6, ASIZE / STORE_BYTES); // loop iterations
bind(BM_INIT_LOOP);
// for (i = 0; i < ASIZE; ++i)
// bc[i] = m;
for (int i = 0; i < 4; i++) {
sd(tmp5, Address(ch1, i * wordSize));
}
add(ch1, ch1, 32);
sub(tmp6, tmp6, 4);
bgtz(tmp6, BM_INIT_LOOP);
sub(nlen_tmp, needle_len, 1); // m - 1, index of the last element in pattern
Register orig_haystack = tmp5;
mv(orig_haystack, haystack);
// result_tmp = tmp4
shadd(haystack_end, result_tmp, haystack, haystack_end, haystack_chr_shift);
sub(ch2, needle_len, 1); // bc offset init value, ch2 is t1
mv(tmp3, needle);
// for (i = 0; i < m - 1; ) {
// c = pattern[i];
// ++i;
// // c < 256 for Latin1 string, so, no need for branch
// #ifdef PATTERN_STRING_IS_LATIN1
// bc[c] = m - i;
// #else
// if (c < ASIZE) bc[c] = m - i;
// #endif
// }
bind(BCLOOP);
(this->*needle_load_1chr)(ch1, Address(tmp3), noreg);
add(tmp3, tmp3, needle_chr_size);
if (!needle_isL) {
// ae == StrIntrinsicNode::UU
mv(tmp6, ASIZE);
bgeu(ch1, tmp6, BCSKIP);
}
add(tmp4, sp, ch1);
sb(ch2, Address(tmp4)); // store skip offset to BC offset table
bind(BCSKIP);
sub(ch2, ch2, 1); // for next pattern element, skip distance -1
bgtz(ch2, BCLOOP);
// tmp6: pattern end, address after needle
shadd(tmp6, needle_len, needle, tmp6, needle_chr_shift);
if (needle_isL == haystack_isL) {
// load last 8 bytes (8LL/4UU symbols)
ld(tmp6, Address(tmp6, -wordSize));
} else {
// UL: from UTF-16(source) search Latin1(pattern)
lwu(tmp6, Address(tmp6, -wordSize / 2)); // load last 4 bytes(4 symbols)
// convert Latin1 to UTF. eg: 0x0000abcd -> 0x0a0b0c0d
// We'll have to wait until load completed, but it's still faster than per-character loads+checks
srli(tmp3, tmp6, BitsPerByte * (wordSize / 2 - needle_chr_size)); // pattern[m-1], eg:0x0000000a
slli(ch2, tmp6, XLEN - 24);
srli(ch2, ch2, XLEN - 8); // pattern[m-2], 0x0000000b
slli(ch1, tmp6, XLEN - 16);
srli(ch1, ch1, XLEN - 8); // pattern[m-3], 0x0000000c
andi(tmp6, tmp6, 0xff); // pattern[m-4], 0x0000000d
slli(ch2, ch2, 16);
orr(ch2, ch2, ch1); // 0x00000b0c
slli(result, tmp3, 48); // use result as temp register
orr(tmp6, tmp6, result); // 0x0a00000d
slli(result, ch2, 16);
orr(tmp6, tmp6, result); // UTF-16:0x0a0b0c0d
}
// i = m - 1;
// skipch = j + i;
// if (skipch == pattern[m - 1]
// for (k = m - 2; k >= 0 && pattern[k] == src[k + j]; --k);
// else
// move j with bad char offset table
bind(BMLOOPSTR2);
// compare pattern to source string backward
shadd(result, nlen_tmp, haystack, result, haystack_chr_shift);
(this->*haystack_load_1chr)(skipch, Address(result), noreg);
sub(nlen_tmp, nlen_tmp, firstStep); // nlen_tmp is positive here, because needle_len >= 8
if (needle_isL == haystack_isL) {
// re-init tmp3. It's for free because it's executed in parallel with
// load above. Alternative is to initialize it before loop, but it'll
// affect performance on in-order systems with 2 or more ld/st pipelines
srli(tmp3, tmp6, BitsPerByte * (wordSize - needle_chr_size)); // UU/LL: pattern[m-1]
}
if (!isLL) { // UU/UL case
slli(ch2, nlen_tmp, 1); // offsets in bytes
}
bne(tmp3, skipch, BMSKIP); // if not equal, skipch is bad char
add(result, haystack, isLL ? nlen_tmp : ch2);
ld(ch2, Address(result)); // load 8 bytes from source string
mv(ch1, tmp6);
if (isLL) {
j(BMLOOPSTR1_AFTER_LOAD);
} else {
sub(nlen_tmp, nlen_tmp, 1); // no need to branch for UU/UL case. cnt1 >= 8
j(BMLOOPSTR1_CMP);
}
bind(BMLOOPSTR1);
shadd(ch1, nlen_tmp, needle, ch1, needle_chr_shift);
(this->*needle_load_1chr)(ch1, Address(ch1), noreg);
shadd(ch2, nlen_tmp, haystack, ch2, haystack_chr_shift);
(this->*haystack_load_1chr)(ch2, Address(ch2), noreg);
bind(BMLOOPSTR1_AFTER_LOAD);
sub(nlen_tmp, nlen_tmp, 1);
bltz(nlen_tmp, BMLOOPSTR1_LASTCMP);
bind(BMLOOPSTR1_CMP);
beq(ch1, ch2, BMLOOPSTR1);
bind(BMSKIP);
if (!isLL) {
// if we've met UTF symbol while searching Latin1 pattern, then we can
// skip needle_len symbols
if (needle_isL != haystack_isL) {
mv(result_tmp, needle_len);
} else {
mv(result_tmp, 1);
}
mv(t0, ASIZE);
bgeu(skipch, t0, BMADV);
}
add(result_tmp, sp, skipch);
lbu(result_tmp, Address(result_tmp)); // load skip offset
bind(BMADV);
sub(nlen_tmp, needle_len, 1);
// move haystack after bad char skip offset
shadd(haystack, result_tmp, haystack, result, haystack_chr_shift);
ble(haystack, haystack_end, BMLOOPSTR2);
add(sp, sp, ASIZE);
j(NOMATCH);
bind(BMLOOPSTR1_LASTCMP);
bne(ch1, ch2, BMSKIP);
bind(BMMATCH);
sub(result, haystack, orig_haystack);
if (!haystack_isL) {
srli(result, result, 1);
}
add(sp, sp, ASIZE);
j(DONE);
bind(LINEARSTUB);
sub(t0, needle_len, 16); // small patterns still should be handled by simple algorithm
bltz(t0, LINEARSEARCH);
mv(result, zr);
RuntimeAddress stub = NULL;
if (isLL) {
stub = RuntimeAddress(StubRoutines::riscv::string_indexof_linear_ll());
assert(stub.target() != NULL, "string_indexof_linear_ll stub has not been generated");
} else if (needle_isL) {
stub = RuntimeAddress(StubRoutines::riscv::string_indexof_linear_ul());
assert(stub.target() != NULL, "string_indexof_linear_ul stub has not been generated");
} else {
stub = RuntimeAddress(StubRoutines::riscv::string_indexof_linear_uu());
assert(stub.target() != NULL, "string_indexof_linear_uu stub has not been generated");
}
trampoline_call(stub);
j(DONE);
bind(NOMATCH);
mv(result, -1);
j(DONE);
bind(LINEARSEARCH);
string_indexof_linearscan(haystack, needle, haystack_len, needle_len, tmp1, tmp2, tmp3, tmp4, -1, result, ae);
bind(DONE);
BLOCK_COMMENT("} string_indexof");
}
// string_indexof
// result: x10
// src: x11
// src_count: x12
// pattern: x13
// pattern_count: x14 or 1/2/3/4
void C2_MacroAssembler::string_indexof_linearscan(Register haystack, Register needle,
Register haystack_len, Register needle_len,
Register tmp1, Register tmp2,
Register tmp3, Register tmp4,
int needle_con_cnt, Register result, int ae)
{
// Note:
// needle_con_cnt > 0 means needle_len register is invalid, needle length is constant
// for UU/LL: needle_con_cnt[1, 4], UL: needle_con_cnt = 1
assert(needle_con_cnt <= 4, "Invalid needle constant count");
assert(ae != StrIntrinsicNode::LU, "Invalid encoding");
Register ch1 = t0;
Register ch2 = t1;
Register hlen_neg = haystack_len, nlen_neg = needle_len;
Register nlen_tmp = tmp1, hlen_tmp = tmp2, result_tmp = tmp4;
bool isLL = ae == StrIntrinsicNode::LL;
bool needle_isL = ae == StrIntrinsicNode::LL || ae == StrIntrinsicNode::UL;
bool haystack_isL = ae == StrIntrinsicNode::LL || ae == StrIntrinsicNode::LU;
int needle_chr_shift = needle_isL ? 0 : 1;
int haystack_chr_shift = haystack_isL ? 0 : 1;
int needle_chr_size = needle_isL ? 1 : 2;
int haystack_chr_size = haystack_isL ? 1 : 2;
load_chr_insn needle_load_1chr = needle_isL ? (load_chr_insn)&MacroAssembler::lbu :
(load_chr_insn)&MacroAssembler::lhu;
load_chr_insn haystack_load_1chr = haystack_isL ? (load_chr_insn)&MacroAssembler::lbu :
(load_chr_insn)&MacroAssembler::lhu;
load_chr_insn load_2chr = isLL ? (load_chr_insn)&MacroAssembler::lhu : (load_chr_insn)&MacroAssembler::lwu;
load_chr_insn load_4chr = isLL ? (load_chr_insn)&MacroAssembler::lwu : (load_chr_insn)&MacroAssembler::ld;
Label DO1, DO2, DO3, MATCH, NOMATCH, DONE;
Register first = tmp3;
if (needle_con_cnt == -1) {
Label DOSHORT, FIRST_LOOP, STR2_NEXT, STR1_LOOP, STR1_NEXT;
sub(t0, needle_len, needle_isL == haystack_isL ? 4 : 2);
bltz(t0, DOSHORT);
(this->*needle_load_1chr)(first, Address(needle), noreg);
slli(t0, needle_len, needle_chr_shift);
add(needle, needle, t0);
neg(nlen_neg, t0);
slli(t0, result_tmp, haystack_chr_shift);
add(haystack, haystack, t0);
neg(hlen_neg, t0);
bind(FIRST_LOOP);
add(t0, haystack, hlen_neg);
(this->*haystack_load_1chr)(ch2, Address(t0), noreg);
beq(first, ch2, STR1_LOOP);
bind(STR2_NEXT);
add(hlen_neg, hlen_neg, haystack_chr_size);
blez(hlen_neg, FIRST_LOOP);
j(NOMATCH);
bind(STR1_LOOP);
add(nlen_tmp, nlen_neg, needle_chr_size);
add(hlen_tmp, hlen_neg, haystack_chr_size);
bgez(nlen_tmp, MATCH);
bind(STR1_NEXT);
add(ch1, needle, nlen_tmp);
(this->*needle_load_1chr)(ch1, Address(ch1), noreg);
add(ch2, haystack, hlen_tmp);
(this->*haystack_load_1chr)(ch2, Address(ch2), noreg);
bne(ch1, ch2, STR2_NEXT);
add(nlen_tmp, nlen_tmp, needle_chr_size);
add(hlen_tmp, hlen_tmp, haystack_chr_size);
bltz(nlen_tmp, STR1_NEXT);
j(MATCH);
bind(DOSHORT);
if (needle_isL == haystack_isL) {
sub(t0, needle_len, 2);
bltz(t0, DO1);
bgtz(t0, DO3);
}
}
if (needle_con_cnt == 4) {
Label CH1_LOOP;
(this->*load_4chr)(ch1, Address(needle), noreg);
sub(result_tmp, haystack_len, 4);
slli(tmp3, result_tmp, haystack_chr_shift); // result as tmp
add(haystack, haystack, tmp3);
neg(hlen_neg, tmp3);
bind(CH1_LOOP);
add(ch2, haystack, hlen_neg);
(this->*load_4chr)(ch2, Address(ch2), noreg);
beq(ch1, ch2, MATCH);
add(hlen_neg, hlen_neg, haystack_chr_size);
blez(hlen_neg, CH1_LOOP);
j(NOMATCH);
}
if ((needle_con_cnt == -1 && needle_isL == haystack_isL) || needle_con_cnt == 2) {
Label CH1_LOOP;
BLOCK_COMMENT("string_indexof DO2 {");
bind(DO2);
(this->*load_2chr)(ch1, Address(needle), noreg);
if (needle_con_cnt == 2) {
sub(result_tmp, haystack_len, 2);
}
slli(tmp3, result_tmp, haystack_chr_shift);
add(haystack, haystack, tmp3);
neg(hlen_neg, tmp3);
bind(CH1_LOOP);
add(tmp3, haystack, hlen_neg);
(this->*load_2chr)(ch2, Address(tmp3), noreg);
beq(ch1, ch2, MATCH);
add(hlen_neg, hlen_neg, haystack_chr_size);
blez(hlen_neg, CH1_LOOP);
j(NOMATCH);
BLOCK_COMMENT("} string_indexof DO2");
}
if ((needle_con_cnt == -1 && needle_isL == haystack_isL) || needle_con_cnt == 3) {
Label FIRST_LOOP, STR2_NEXT, STR1_LOOP;
BLOCK_COMMENT("string_indexof DO3 {");
bind(DO3);
(this->*load_2chr)(first, Address(needle), noreg);
(this->*needle_load_1chr)(ch1, Address(needle, 2 * needle_chr_size), noreg);
if (needle_con_cnt == 3) {
sub(result_tmp, haystack_len, 3);
}
slli(hlen_tmp, result_tmp, haystack_chr_shift);
add(haystack, haystack, hlen_tmp);
neg(hlen_neg, hlen_tmp);
bind(FIRST_LOOP);
add(ch2, haystack, hlen_neg);
(this->*load_2chr)(ch2, Address(ch2), noreg);
beq(first, ch2, STR1_LOOP);
bind(STR2_NEXT);
add(hlen_neg, hlen_neg, haystack_chr_size);
blez(hlen_neg, FIRST_LOOP);
j(NOMATCH);
bind(STR1_LOOP);
add(hlen_tmp, hlen_neg, 2 * haystack_chr_size);
add(ch2, haystack, hlen_tmp);
(this->*haystack_load_1chr)(ch2, Address(ch2), noreg);
bne(ch1, ch2, STR2_NEXT);
j(MATCH);
BLOCK_COMMENT("} string_indexof DO3");
}
if (needle_con_cnt == -1 || needle_con_cnt == 1) {
Label DO1_LOOP;
BLOCK_COMMENT("string_indexof DO1 {");
bind(DO1);
(this->*needle_load_1chr)(ch1, Address(needle), noreg);
sub(result_tmp, haystack_len, 1);
mv(tmp3, result_tmp);
if (haystack_chr_shift) {
slli(tmp3, result_tmp, haystack_chr_shift);
}
add(haystack, haystack, tmp3);
neg(hlen_neg, tmp3);
bind(DO1_LOOP);
add(tmp3, haystack, hlen_neg);
(this->*haystack_load_1chr)(ch2, Address(tmp3), noreg);
beq(ch1, ch2, MATCH);
add(hlen_neg, hlen_neg, haystack_chr_size);
blez(hlen_neg, DO1_LOOP);
BLOCK_COMMENT("} string_indexof DO1");
}
bind(NOMATCH);
mv(result, -1);
j(DONE);
bind(MATCH);
srai(t0, hlen_neg, haystack_chr_shift);
add(result, result_tmp, t0);
bind(DONE);
}
// Compare strings.
void C2_MacroAssembler::string_compare(Register str1, Register str2,
Register cnt1, Register cnt2, Register result, Register tmp1, Register tmp2,
Register tmp3, int ae)
{
Label DONE, SHORT_LOOP, SHORT_STRING, SHORT_LAST, TAIL, STUB,
DIFFERENCE, NEXT_WORD, SHORT_LOOP_TAIL, SHORT_LAST2, SHORT_LAST_INIT,
SHORT_LOOP_START, TAIL_CHECK, L;
const int STUB_THRESHOLD = 64 + 8;
bool isLL = ae == StrIntrinsicNode::LL;
bool isLU = ae == StrIntrinsicNode::LU;
bool isUL = ae == StrIntrinsicNode::UL;
bool str1_isL = isLL || isLU;
bool str2_isL = isLL || isUL;
// for L strings, 1 byte for 1 character
// for U strings, 2 bytes for 1 character
int str1_chr_size = str1_isL ? 1 : 2;
int str2_chr_size = str2_isL ? 1 : 2;
int minCharsInWord = isLL ? wordSize : wordSize / 2;
load_chr_insn str1_load_chr = str1_isL ? (load_chr_insn)&MacroAssembler::lbu : (load_chr_insn)&MacroAssembler::lhu;
load_chr_insn str2_load_chr = str2_isL ? (load_chr_insn)&MacroAssembler::lbu : (load_chr_insn)&MacroAssembler::lhu;
BLOCK_COMMENT("string_compare {");
// Bizzarely, the counts are passed in bytes, regardless of whether they
// are L or U strings, however the result is always in characters.
if (!str1_isL) {
sraiw(cnt1, cnt1, 1);
}
if (!str2_isL) {
sraiw(cnt2, cnt2, 1);
}
// Compute the minimum of the string lengths and save the difference in result.
sub(result, cnt1, cnt2);
bgt(cnt1, cnt2, L);
mv(cnt2, cnt1);
bind(L);
// A very short string
mv(t0, minCharsInWord);
ble(cnt2, t0, SHORT_STRING);
// Compare longwords
// load first parts of strings and finish initialization while loading
{
if (str1_isL == str2_isL) { // LL or UU
// load 8 bytes once to compare
ld(tmp1, Address(str1));
beq(str1, str2, DONE);
ld(tmp2, Address(str2));
mv(t0, STUB_THRESHOLD);
bge(cnt2, t0, STUB);
sub(cnt2, cnt2, minCharsInWord);
beqz(cnt2, TAIL_CHECK);
// convert cnt2 from characters to bytes
if (!str1_isL) {
slli(cnt2, cnt2, 1);
}
add(str2, str2, cnt2);
add(str1, str1, cnt2);
sub(cnt2, zr, cnt2);
} else if (isLU) { // LU case
lwu(tmp1, Address(str1));
ld(tmp2, Address(str2));
mv(t0, STUB_THRESHOLD);
bge(cnt2, t0, STUB);
addi(cnt2, cnt2, -4);
add(str1, str1, cnt2);
sub(cnt1, zr, cnt2);
slli(cnt2, cnt2, 1);
add(str2, str2, cnt2);
inflate_lo32(tmp3, tmp1);
mv(tmp1, tmp3);
sub(cnt2, zr, cnt2);
addi(cnt1, cnt1, 4);
} else { // UL case
ld(tmp1, Address(str1));
lwu(tmp2, Address(str2));
mv(t0, STUB_THRESHOLD);
bge(cnt2, t0, STUB);
addi(cnt2, cnt2, -4);
slli(t0, cnt2, 1);
sub(cnt1, zr, t0);
add(str1, str1, t0);
add(str2, str2, cnt2);
inflate_lo32(tmp3, tmp2);
mv(tmp2, tmp3);
sub(cnt2, zr, cnt2);
addi(cnt1, cnt1, 8);
}
addi(cnt2, cnt2, isUL ? 4 : 8);
bgez(cnt2, TAIL);
xorr(tmp3, tmp1, tmp2);
bnez(tmp3, DIFFERENCE);
// main loop
bind(NEXT_WORD);
if (str1_isL == str2_isL) { // LL or UU
add(t0, str1, cnt2);
ld(tmp1, Address(t0));
add(t0, str2, cnt2);
ld(tmp2, Address(t0));
addi(cnt2, cnt2, 8);
} else if (isLU) { // LU case
add(t0, str1, cnt1);
lwu(tmp1, Address(t0));
add(t0, str2, cnt2);
ld(tmp2, Address(t0));
addi(cnt1, cnt1, 4);
inflate_lo32(tmp3, tmp1);
mv(tmp1, tmp3);
addi(cnt2, cnt2, 8);
} else { // UL case
add(t0, str2, cnt2);
lwu(tmp2, Address(t0));
add(t0, str1, cnt1);
ld(tmp1, Address(t0));
inflate_lo32(tmp3, tmp2);
mv(tmp2, tmp3);
addi(cnt1, cnt1, 8);
addi(cnt2, cnt2, 4);
}
bgez(cnt2, TAIL);
xorr(tmp3, tmp1, tmp2);
beqz(tmp3, NEXT_WORD);
j(DIFFERENCE);
bind(TAIL);
xorr(tmp3, tmp1, tmp2);
bnez(tmp3, DIFFERENCE);
// Last longword. In the case where length == 4 we compare the
// same longword twice, but that's still faster than another
// conditional branch.
if (str1_isL == str2_isL) { // LL or UU
ld(tmp1, Address(str1));
ld(tmp2, Address(str2));
} else if (isLU) { // LU case
lwu(tmp1, Address(str1));
ld(tmp2, Address(str2));
inflate_lo32(tmp3, tmp1);
mv(tmp1, tmp3);
} else { // UL case
lwu(tmp2, Address(str2));
ld(tmp1, Address(str1));
inflate_lo32(tmp3, tmp2);
mv(tmp2, tmp3);
}
bind(TAIL_CHECK);
xorr(tmp3, tmp1, tmp2);
beqz(tmp3, DONE);
// Find the first different characters in the longwords and
// compute their difference.
bind(DIFFERENCE);
ctzc_bit(result, tmp3, isLL); // count zero from lsb to msb
srl(tmp1, tmp1, result);
srl(tmp2, tmp2, result);
if (isLL) {
andi(tmp1, tmp1, 0xFF);
andi(tmp2, tmp2, 0xFF);
} else {
andi(tmp1, tmp1, 0xFFFF);
andi(tmp2, tmp2, 0xFFFF);
}
sub(result, tmp1, tmp2);
j(DONE);
}
bind(STUB);
RuntimeAddress stub = NULL;
switch (ae) {
case StrIntrinsicNode::LL:
stub = RuntimeAddress(StubRoutines::riscv::compare_long_string_LL());
break;
case StrIntrinsicNode::UU:
stub = RuntimeAddress(StubRoutines::riscv::compare_long_string_UU());
break;
case StrIntrinsicNode::LU:
stub = RuntimeAddress(StubRoutines::riscv::compare_long_string_LU());
break;
case StrIntrinsicNode::UL:
stub = RuntimeAddress(StubRoutines::riscv::compare_long_string_UL());
break;
default:
ShouldNotReachHere();
}
assert(stub.target() != NULL, "compare_long_string stub has not been generated");
trampoline_call(stub);
j(DONE);
bind(SHORT_STRING);
// Is the minimum length zero?
beqz(cnt2, DONE);
// arrange code to do most branches while loading and loading next characters
// while comparing previous
(this->*str1_load_chr)(tmp1, Address(str1), t0);
addi(str1, str1, str1_chr_size);
addi(cnt2, cnt2, -1);
beqz(cnt2, SHORT_LAST_INIT);
(this->*str2_load_chr)(cnt1, Address(str2), t0);
addi(str2, str2, str2_chr_size);
j(SHORT_LOOP_START);
bind(SHORT_LOOP);
addi(cnt2, cnt2, -1);
beqz(cnt2, SHORT_LAST);
bind(SHORT_LOOP_START);
(this->*str1_load_chr)(tmp2, Address(str1), t0);
addi(str1, str1, str1_chr_size);
(this->*str2_load_chr)(t0, Address(str2), t0);
addi(str2, str2, str2_chr_size);
bne(tmp1, cnt1, SHORT_LOOP_TAIL);
addi(cnt2, cnt2, -1);
beqz(cnt2, SHORT_LAST2);
(this->*str1_load_chr)(tmp1, Address(str1), t0);
addi(str1, str1, str1_chr_size);
(this->*str2_load_chr)(cnt1, Address(str2), t0);
addi(str2, str2, str2_chr_size);
beq(tmp2, t0, SHORT_LOOP);
sub(result, tmp2, t0);
j(DONE);
bind(SHORT_LOOP_TAIL);
sub(result, tmp1, cnt1);
j(DONE);
bind(SHORT_LAST2);
beq(tmp2, t0, DONE);
sub(result, tmp2, t0);
j(DONE);
bind(SHORT_LAST_INIT);
(this->*str2_load_chr)(cnt1, Address(str2), t0);
addi(str2, str2, str2_chr_size);
bind(SHORT_LAST);
beq(tmp1, cnt1, DONE);
sub(result, tmp1, cnt1);
bind(DONE);
BLOCK_COMMENT("} string_compare");
}
void C2_MacroAssembler::arrays_equals(Register a1, Register a2, Register tmp3,
Register tmp4, Register tmp5, Register tmp6, Register result,
Register cnt1, int elem_size) {
Label DONE, SAME, NEXT_DWORD, SHORT, TAIL, TAIL2, IS_TMP5_ZR;
Register tmp1 = t0;
Register tmp2 = t1;
Register cnt2 = tmp2; // cnt2 only used in array length compare
Register elem_per_word = tmp6;
int log_elem_size = exact_log2(elem_size);
int length_offset = arrayOopDesc::length_offset_in_bytes();
int base_offset = arrayOopDesc::base_offset_in_bytes(elem_size == 2 ? T_CHAR : T_BYTE);
assert(elem_size == 1 || elem_size == 2, "must be char or byte");
assert_different_registers(a1, a2, result, cnt1, t0, t1, tmp3, tmp4, tmp5, tmp6);
mv(elem_per_word, wordSize / elem_size);
BLOCK_COMMENT("arrays_equals {");
// if (a1 == a2), return true
beq(a1, a2, SAME);
mv(result, false);
beqz(a1, DONE);
beqz(a2, DONE);
lwu(cnt1, Address(a1, length_offset));
lwu(cnt2, Address(a2, length_offset));
bne(cnt2, cnt1, DONE);
beqz(cnt1, SAME);
slli(tmp5, cnt1, 3 + log_elem_size);
sub(tmp5, zr, tmp5);
add(a1, a1, base_offset);
add(a2, a2, base_offset);
ld(tmp3, Address(a1, 0));
ld(tmp4, Address(a2, 0));
ble(cnt1, elem_per_word, SHORT); // short or same
// Main 16 byte comparison loop with 2 exits
bind(NEXT_DWORD); {
ld(tmp1, Address(a1, wordSize));
ld(tmp2, Address(a2, wordSize));
sub(cnt1, cnt1, 2 * wordSize / elem_size);
blez(cnt1, TAIL);
bne(tmp3, tmp4, DONE);
ld(tmp3, Address(a1, 2 * wordSize));
ld(tmp4, Address(a2, 2 * wordSize));
add(a1, a1, 2 * wordSize);
add(a2, a2, 2 * wordSize);
ble(cnt1, elem_per_word, TAIL2);
} beq(tmp1, tmp2, NEXT_DWORD);
j(DONE);
bind(TAIL);
xorr(tmp4, tmp3, tmp4);
xorr(tmp2, tmp1, tmp2);
sll(tmp2, tmp2, tmp5);
orr(tmp5, tmp4, tmp2);
j(IS_TMP5_ZR);
bind(TAIL2);
bne(tmp1, tmp2, DONE);
bind(SHORT);
xorr(tmp4, tmp3, tmp4);
sll(tmp5, tmp4, tmp5);
bind(IS_TMP5_ZR);
bnez(tmp5, DONE);
bind(SAME);
mv(result, true);
// That's it.
bind(DONE);
BLOCK_COMMENT("} array_equals");
}
// Compare Strings
// For Strings we're passed the address of the first characters in a1
// and a2 and the length in cnt1.
// elem_size is the element size in bytes: either 1 or 2.
// There are two implementations. For arrays >= 8 bytes, all
// comparisons (including the final one, which may overlap) are
// performed 8 bytes at a time. For strings < 8 bytes, we compare a
// halfword, then a short, and then a byte.
void C2_MacroAssembler::string_equals(Register a1, Register a2,
Register result, Register cnt1, int elem_size)
{
Label SAME, DONE, SHORT, NEXT_WORD;
Register tmp1 = t0;
Register tmp2 = t1;
assert(elem_size == 1 || elem_size == 2, "must be 2 or 1 byte");
assert_different_registers(a1, a2, result, cnt1, t0, t1);
BLOCK_COMMENT("string_equals {");
mv(result, false);
// Check for short strings, i.e. smaller than wordSize.
sub(cnt1, cnt1, wordSize);
bltz(cnt1, SHORT);
// Main 8 byte comparison loop.
bind(NEXT_WORD); {
ld(tmp1, Address(a1, 0));
add(a1, a1, wordSize);
ld(tmp2, Address(a2, 0));
add(a2, a2, wordSize);
sub(cnt1, cnt1, wordSize);
bne(tmp1, tmp2, DONE);
} bgtz(cnt1, NEXT_WORD);
// Last longword. In the case where length == 4 we compare the
// same longword twice, but that's still faster than another
// conditional branch.
// cnt1 could be 0, -1, -2, -3, -4 for chars; -4 only happens when
// length == 4.
add(tmp1, a1, cnt1);
ld(tmp1, Address(tmp1, 0));
add(tmp2, a2, cnt1);
ld(tmp2, Address(tmp2, 0));
bne(tmp1, tmp2, DONE);
j(SAME);
bind(SHORT);
Label TAIL03, TAIL01;
// 0-7 bytes left.
andi(t0, cnt1, 4);
beqz(t0, TAIL03);
{
lwu(tmp1, Address(a1, 0));
add(a1, a1, 4);
lwu(tmp2, Address(a2, 0));
add(a2, a2, 4);
bne(tmp1, tmp2, DONE);
}
bind(TAIL03);
// 0-3 bytes left.
andi(t0, cnt1, 2);
beqz(t0, TAIL01);
{
lhu(tmp1, Address(a1, 0));
add(a1, a1, 2);
lhu(tmp2, Address(a2, 0));
add(a2, a2, 2);
bne(tmp1, tmp2, DONE);
}
bind(TAIL01);
if (elem_size == 1) { // Only needed when comparing 1-byte elements
// 0-1 bytes left.
andi(t0, cnt1, 1);
beqz(t0, SAME);
{
lbu(tmp1, a1, 0);
lbu(tmp2, a2, 0);
bne(tmp1, tmp2, DONE);
}
}
// Arrays are equal.
bind(SAME);
mv(result, true);
// That's it.
bind(DONE);
BLOCK_COMMENT("} string_equals");
}
typedef void (Assembler::*conditional_branch_insn)(Register op1, Register op2, Label& label, bool is_far);
typedef void (MacroAssembler::*float_conditional_branch_insn)(FloatRegister op1, FloatRegister op2, Label& label,
bool is_far, bool is_unordered);
static conditional_branch_insn conditional_branches[] =
{
/* SHORT branches */
(conditional_branch_insn)&Assembler::beq,
(conditional_branch_insn)&Assembler::bgt,
NULL, // BoolTest::overflow
(conditional_branch_insn)&Assembler::blt,
(conditional_branch_insn)&Assembler::bne,
(conditional_branch_insn)&Assembler::ble,
NULL, // BoolTest::no_overflow
(conditional_branch_insn)&Assembler::bge,
/* UNSIGNED branches */
(conditional_branch_insn)&Assembler::beq,
(conditional_branch_insn)&Assembler::bgtu,
NULL,
(conditional_branch_insn)&Assembler::bltu,
(conditional_branch_insn)&Assembler::bne,
(conditional_branch_insn)&Assembler::bleu,
NULL,
(conditional_branch_insn)&Assembler::bgeu
};
static float_conditional_branch_insn float_conditional_branches[] =
{
/* FLOAT SHORT branches */
(float_conditional_branch_insn)&MacroAssembler::float_beq,
(float_conditional_branch_insn)&MacroAssembler::float_bgt,
NULL, // BoolTest::overflow
(float_conditional_branch_insn)&MacroAssembler::float_blt,
(float_conditional_branch_insn)&MacroAssembler::float_bne,
(float_conditional_branch_insn)&MacroAssembler::float_ble,
NULL, // BoolTest::no_overflow
(float_conditional_branch_insn)&MacroAssembler::float_bge,
/* DOUBLE SHORT branches */
(float_conditional_branch_insn)&MacroAssembler::double_beq,
(float_conditional_branch_insn)&MacroAssembler::double_bgt,
NULL,
(float_conditional_branch_insn)&MacroAssembler::double_blt,
(float_conditional_branch_insn)&MacroAssembler::double_bne,
(float_conditional_branch_insn)&MacroAssembler::double_ble,
NULL,
(float_conditional_branch_insn)&MacroAssembler::double_bge
};
void C2_MacroAssembler::cmp_branch(int cmpFlag, Register op1, Register op2, Label& label, bool is_far) {
assert(cmpFlag >= 0 && cmpFlag < (int)(sizeof(conditional_branches) / sizeof(conditional_branches[0])),
"invalid conditional branch index");
(this->*conditional_branches[cmpFlag])(op1, op2, label, is_far);
}
// This is a function should only be used by C2. Flip the unordered when unordered-greater, C2 would use
// unordered-lesser instead of unordered-greater. Finally, commute the result bits at function do_one_bytecode().
void C2_MacroAssembler::float_cmp_branch(int cmpFlag, FloatRegister op1, FloatRegister op2, Label& label, bool is_far) {
assert(cmpFlag >= 0 && cmpFlag < (int)(sizeof(float_conditional_branches) / sizeof(float_conditional_branches[0])),
"invalid float conditional branch index");
int booltest_flag = cmpFlag & ~(C2_MacroAssembler::double_branch_mask);
(this->*float_conditional_branches[cmpFlag])(op1, op2, label, is_far,
(booltest_flag == (BoolTest::ge) || booltest_flag == (BoolTest::gt)) ? false : true);
}
void C2_MacroAssembler::enc_cmpUEqNeLeGt_imm0_branch(int cmpFlag, Register op1, Label& L, bool is_far) {
switch (cmpFlag) {
case BoolTest::eq:
case BoolTest::le:
beqz(op1, L, is_far);
break;
case BoolTest::ne:
case BoolTest::gt:
bnez(op1, L, is_far);
break;
default:
ShouldNotReachHere();
}
}
void C2_MacroAssembler::enc_cmpEqNe_imm0_branch(int cmpFlag, Register op1, Label& L, bool is_far) {
switch (cmpFlag) {
case BoolTest::eq:
beqz(op1, L, is_far);
break;
case BoolTest::ne:
bnez(op1, L, is_far);
break;
default:
ShouldNotReachHere();
}
}
void C2_MacroAssembler::enc_cmove(int cmpFlag, Register op1, Register op2, Register dst, Register src) {
Label L;
cmp_branch(cmpFlag ^ (1 << neg_cond_bits), op1, op2, L);
mv(dst, src);
bind(L);
}
// Set dst to NaN if any NaN input.
void C2_MacroAssembler::minmax_FD(FloatRegister dst, FloatRegister src1, FloatRegister src2,
bool is_double, bool is_min) {
assert_different_registers(dst, src1, src2);
Label Done;
fsflags(zr);
if (is_double) {
is_min ? fmin_d(dst, src1, src2)
: fmax_d(dst, src1, src2);
// Checking NaNs
flt_d(zr, src1, src2);
} else {
is_min ? fmin_s(dst, src1, src2)
: fmax_s(dst, src1, src2);
// Checking NaNs
flt_s(zr, src1, src2);
}
frflags(t0);
beqz(t0, Done);
// In case of NaNs
is_double ? fadd_d(dst, src1, src2)
: fadd_s(dst, src1, src2);
bind(Done);
}
void C2_MacroAssembler::element_compare(Register a1, Register a2, Register result, Register cnt, Register tmp1, Register tmp2,
VectorRegister vr1, VectorRegister vr2, VectorRegister vrs, bool islatin, Label &DONE) {
Label loop;
Assembler::SEW sew = islatin ? Assembler::e8 : Assembler::e16;
bind(loop);
vsetvli(tmp1, cnt, sew, Assembler::m2);
vlex_v(vr1, a1, sew);
vlex_v(vr2, a2, sew);
vmsne_vv(vrs, vr1, vr2);
vfirst_m(tmp2, vrs);
bgez(tmp2, DONE);
sub(cnt, cnt, tmp1);
if (!islatin) {
slli(tmp1, tmp1, 1); // get byte counts
}
add(a1, a1, tmp1);
add(a2, a2, tmp1);
bnez(cnt, loop);
mv(result, true);
}
void C2_MacroAssembler::string_equals_v(Register a1, Register a2, Register result, Register cnt, int elem_size) {
Label DONE;
Register tmp1 = t0;
Register tmp2 = t1;
BLOCK_COMMENT("string_equals_v {");
mv(result, false);
if (elem_size == 2) {
srli(cnt, cnt, 1);
}
element_compare(a1, a2, result, cnt, tmp1, tmp2, v0, v2, v0, elem_size == 1, DONE);
bind(DONE);
BLOCK_COMMENT("} string_equals_v");
}
// used by C2 ClearArray patterns.
// base: Address of a buffer to be zeroed
// cnt: Count in HeapWords
//
// base, cnt, v0, v1 and t0 are clobbered.
void C2_MacroAssembler::clear_array_v(Register base, Register cnt) {
Label loop;
// making zero words
vsetvli(t0, cnt, Assembler::e64, Assembler::m4);
vxor_vv(v0, v0, v0);
bind(loop);
vsetvli(t0, cnt, Assembler::e64, Assembler::m4);
vse64_v(v0, base);
sub(cnt, cnt, t0);
shadd(base, t0, base, t0, 3);
bnez(cnt, loop);
}
void C2_MacroAssembler::arrays_equals_v(Register a1, Register a2, Register result,
Register cnt1, int elem_size) {
Label DONE;
Register tmp1 = t0;
Register tmp2 = t1;
Register cnt2 = tmp2;
int length_offset = arrayOopDesc::length_offset_in_bytes();
int base_offset = arrayOopDesc::base_offset_in_bytes(elem_size == 2 ? T_CHAR : T_BYTE);
BLOCK_COMMENT("arrays_equals_v {");
// if (a1 == a2), return true
mv(result, true);
beq(a1, a2, DONE);
mv(result, false);
// if a1 == null or a2 == null, return false
beqz(a1, DONE);
beqz(a2, DONE);
// if (a1.length != a2.length), return false
lwu(cnt1, Address(a1, length_offset));
lwu(cnt2, Address(a2, length_offset));
bne(cnt1, cnt2, DONE);
la(a1, Address(a1, base_offset));
la(a2, Address(a2, base_offset));
element_compare(a1, a2, result, cnt1, tmp1, tmp2, v0, v2, v0, elem_size == 1, DONE);
bind(DONE);
BLOCK_COMMENT("} arrays_equals_v");
}
void C2_MacroAssembler::string_compare_v(Register str1, Register str2, Register cnt1, Register cnt2,
Register result, Register tmp1, Register tmp2, int encForm) {
Label DIFFERENCE, DONE, L, loop;
bool encLL = encForm == StrIntrinsicNode::LL;
bool encLU = encForm == StrIntrinsicNode::LU;
bool encUL = encForm == StrIntrinsicNode::UL;
bool str1_isL = encLL || encLU;
bool str2_isL = encLL || encUL;
int minCharsInWord = encLL ? wordSize : wordSize / 2;
BLOCK_COMMENT("string_compare {");
// for Latin strings, 1 byte for 1 character
// for UTF16 strings, 2 bytes for 1 character
if (!str1_isL)
sraiw(cnt1, cnt1, 1);
if (!str2_isL)
sraiw(cnt2, cnt2, 1);
// if str1 == str2, return the difference
// save the minimum of the string lengths in cnt2.
sub(result, cnt1, cnt2);
bgt(cnt1, cnt2, L);
mv(cnt2, cnt1);
bind(L);
if (str1_isL == str2_isL) { // LL or UU
element_compare(str1, str2, zr, cnt2, tmp1, tmp2, v2, v4, v1, encLL, DIFFERENCE);
j(DONE);
} else { // LU or UL
Register strL = encLU ? str1 : str2;
Register strU = encLU ? str2 : str1;
VectorRegister vstr1 = encLU ? v4 : v0;
VectorRegister vstr2 = encLU ? v0 : v4;
bind(loop);
vsetvli(tmp1, cnt2, Assembler::e8, Assembler::m2);
vle8_v(vstr1, strL);
vsetvli(tmp1, cnt2, Assembler::e16, Assembler::m4);
vzext_vf2(vstr2, vstr1);
vle16_v(vstr1, strU);
vmsne_vv(v0, vstr2, vstr1);
vfirst_m(tmp2, v0);
bgez(tmp2, DIFFERENCE);
sub(cnt2, cnt2, tmp1);
add(strL, strL, tmp1);
shadd(strU, tmp1, strU, tmp1, 1);
bnez(cnt2, loop);
j(DONE);
}
bind(DIFFERENCE);
slli(tmp1, tmp2, 1);
add(str1, str1, str1_isL ? tmp2 : tmp1);
add(str2, str2, str2_isL ? tmp2 : tmp1);
str1_isL ? lbu(tmp1, Address(str1, 0)) : lhu(tmp1, Address(str1, 0));
str2_isL ? lbu(tmp2, Address(str2, 0)) : lhu(tmp2, Address(str2, 0));
sub(result, tmp1, tmp2);
bind(DONE);
}
void C2_MacroAssembler::byte_array_inflate_v(Register src, Register dst, Register len, Register tmp) {
Label loop;
assert_different_registers(src, dst, len, tmp, t0);
BLOCK_COMMENT("byte_array_inflate_v {");
bind(loop);
vsetvli(tmp, len, Assembler::e8, Assembler::m2);
vle8_v(v2, src);
vsetvli(t0, len, Assembler::e16, Assembler::m4);
vzext_vf2(v0, v2);
vse16_v(v0, dst);
sub(len, len, tmp);
add(src, src, tmp);
shadd(dst, tmp, dst, tmp, 1);
bnez(len, loop);
BLOCK_COMMENT("} byte_array_inflate_v");
}
// Compress char[] array to byte[].
// result: the array length if every element in array can be encoded; 0, otherwise.
void C2_MacroAssembler::char_array_compress_v(Register src, Register dst, Register len, Register result, Register tmp) {
Label done;
encode_iso_array_v(src, dst, len, result, tmp);
beqz(len, done);
mv(result, zr);
bind(done);
}
// result: the number of elements had been encoded.
void C2_MacroAssembler::encode_iso_array_v(Register src, Register dst, Register len, Register result, Register tmp) {
Label loop, DIFFERENCE, DONE;
BLOCK_COMMENT("encode_iso_array_v {");
mv(result, 0);
bind(loop);
mv(tmp, 0xff);
vsetvli(t0, len, Assembler::e16, Assembler::m2);
vle16_v(v2, src);
// if element > 0xff, stop
vmsgtu_vx(v1, v2, tmp);
vfirst_m(tmp, v1);
vmsbf_m(v0, v1);
// compress char to byte
vsetvli(t0, len, Assembler::e8);
vncvt_x_x_w(v1, v2, Assembler::v0_t);
vse8_v(v1, dst, Assembler::v0_t);
bgez(tmp, DIFFERENCE);
add(result, result, t0);
add(dst, dst, t0);
sub(len, len, t0);
shadd(src, t0, src, t0, 1);
bnez(len, loop);
j(DONE);
bind(DIFFERENCE);
add(result, result, tmp);
bind(DONE);
BLOCK_COMMENT("} encode_iso_array_v");
}
void C2_MacroAssembler::count_positives_v(Register ary, Register len, Register result, Register tmp) {
Label LOOP, SET_RESULT, DONE;
BLOCK_COMMENT("count_positives_v {");
assert_different_registers(ary, len, result, tmp);
mv(result, zr);
bind(LOOP);
vsetvli(t0, len, Assembler::e8, Assembler::m4);
vle8_v(v0, ary);
vmslt_vx(v0, v0, zr);
vfirst_m(tmp, v0);
bgez(tmp, SET_RESULT);
// if tmp == -1, all bytes are positive
add(result, result, t0);
sub(len, len, t0);
add(ary, ary, t0);
bnez(len, LOOP);
j(DONE);
// add remaining positive bytes count
bind(SET_RESULT);
add(result, result, tmp);
bind(DONE);
BLOCK_COMMENT("} count_positives_v");
}
void C2_MacroAssembler::string_indexof_char_v(Register str1, Register cnt1,
Register ch, Register result,
Register tmp1, Register tmp2,
bool isL) {
mv(result, zr);
Label loop, MATCH, DONE;
Assembler::SEW sew = isL ? Assembler::e8 : Assembler::e16;
bind(loop);
vsetvli(tmp1, cnt1, sew, Assembler::m4);
vlex_v(v0, str1, sew);
vmseq_vx(v0, v0, ch);
vfirst_m(tmp2, v0);
bgez(tmp2, MATCH); // if equal, return index
add(result, result, tmp1);
sub(cnt1, cnt1, tmp1);
if (!isL) slli(tmp1, tmp1, 1);
add(str1, str1, tmp1);
bnez(cnt1, loop);
mv(result, -1);
j(DONE);
bind(MATCH);
add(result, result, tmp2);
bind(DONE);
}
// Set dst to NaN if any NaN input.
void C2_MacroAssembler::minmax_FD_v(VectorRegister dst, VectorRegister src1, VectorRegister src2,
bool is_double, bool is_min) {
assert_different_registers(dst, src1, src2);
vsetvli(t0, x0, is_double ? Assembler::e64 : Assembler::e32);
is_min ? vfmin_vv(dst, src1, src2)
: vfmax_vv(dst, src1, src2);
vmfne_vv(v0, src1, src1);
vfadd_vv(dst, src1, src1, Assembler::v0_t);
vmfne_vv(v0, src2, src2);
vfadd_vv(dst, src2, src2, Assembler::v0_t);
}
// Set dst to NaN if any NaN input.
void C2_MacroAssembler::reduce_minmax_FD_v(FloatRegister dst,
FloatRegister src1, VectorRegister src2,
VectorRegister tmp1, VectorRegister tmp2,
bool is_double, bool is_min) {
assert_different_registers(src2, tmp1, tmp2);
Label L_done, L_NaN;
vsetvli(t0, x0, is_double ? Assembler::e64 : Assembler::e32);
vfmv_s_f(tmp2, src1);
is_min ? vfredmin_vs(tmp1, src2, tmp2)
: vfredmax_vs(tmp1, src2, tmp2);
fsflags(zr);
// Checking NaNs
vmflt_vf(tmp2, src2, src1);
frflags(t0);
bnez(t0, L_NaN);
j(L_done);
bind(L_NaN);
vfmv_s_f(tmp2, src1);
vfredsum_vs(tmp1, src2, tmp2);
bind(L_done);
vfmv_f_s(dst, tmp1);
}
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