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8024927: Nashorn performance regression with CompressedOops

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Allocate compressed class space at end of Java heap.  For small heap sizes, without CDS, save some space so compressed classes can have the same favorable compression as oops

Reviewed-by: stefank, hseigel, goetz
This commit is contained in:
Coleen Phillimore 2013-10-25 15:19:29 -04:00
parent 4e192289d4
commit 3e6630c07b
8 changed files with 295 additions and 95 deletions
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45
hotspot/src/cpu/x86/vm/macroAssembler_x86.cpp
View file

@ -5049,25 +5049,32 @@ void MacroAssembler::decode_heap_oop_not_null(Register dst, Register src) {
}
void MacroAssembler::encode_klass_not_null(Register r) {
assert(Universe::narrow_klass_base() != NULL, "Base should be initialized");
// Use r12 as a scratch register in which to temporarily load the narrow_klass_base.
assert(r != r12_heapbase, "Encoding a klass in r12");
mov64(r12_heapbase, (int64_t)Universe::narrow_klass_base());
subq(r, r12_heapbase);
if (Universe::narrow_klass_base() != NULL) {
// Use r12 as a scratch register in which to temporarily load the narrow_klass_base.
assert(r != r12_heapbase, "Encoding a klass in r12");
mov64(r12_heapbase, (int64_t)Universe::narrow_klass_base());
subq(r, r12_heapbase);
}
if (Universe::narrow_klass_shift() != 0) {
assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong");
shrq(r, LogKlassAlignmentInBytes);
}
reinit_heapbase();
if (Universe::narrow_klass_base() != NULL) {
reinit_heapbase();
}
}
void MacroAssembler::encode_klass_not_null(Register dst, Register src) {
if (dst == src) {
encode_klass_not_null(src);
} else {
mov64(dst, (int64_t)Universe::narrow_klass_base());
negq(dst);
addq(dst, src);
if (Universe::narrow_klass_base() != NULL) {
mov64(dst, (int64_t)Universe::narrow_klass_base());
negq(dst);
addq(dst, src);
} else {
movptr(dst, src);
}
if (Universe::narrow_klass_shift() != 0) {
assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong");
shrq(dst, LogKlassAlignmentInBytes);
@ -5081,15 +5088,19 @@ void MacroAssembler::encode_klass_not_null(Register dst, Register src) {
// generate change, then this method needs to be updated.
int MacroAssembler::instr_size_for_decode_klass_not_null() {
assert (UseCompressedClassPointers, "only for compressed klass ptrs");
// mov64 + addq + shlq? + mov64 (for reinit_heapbase()).
return (Universe::narrow_klass_shift() == 0 ? 20 : 24);
if (Universe::narrow_klass_base() != NULL) {
// mov64 + addq + shlq? + mov64 (for reinit_heapbase()).
return (Universe::narrow_klass_shift() == 0 ? 20 : 24);
} else {
// longest load decode klass function, mov64, leaq
return 16;
}
}
// !!! If the instructions that get generated here change then function
// instr_size_for_decode_klass_not_null() needs to get updated.
void MacroAssembler::decode_klass_not_null(Register r) {
// Note: it will change flags
assert(Universe::narrow_klass_base() != NULL, "Base should be initialized");
assert (UseCompressedClassPointers, "should only be used for compressed headers");
assert(r != r12_heapbase, "Decoding a klass in r12");
// Cannot assert, unverified entry point counts instructions (see .ad file)
@ -5100,14 +5111,15 @@ void MacroAssembler::decode_klass_not_null(Register r) {
shlq(r, LogKlassAlignmentInBytes);
}
// Use r12 as a scratch register in which to temporarily load the narrow_klass_base.
mov64(r12_heapbase, (int64_t)Universe::narrow_klass_base());
addq(r, r12_heapbase);
reinit_heapbase();
if (Universe::narrow_klass_base() != NULL) {
mov64(r12_heapbase, (int64_t)Universe::narrow_klass_base());
addq(r, r12_heapbase);
reinit_heapbase();
}
}
void MacroAssembler::decode_klass_not_null(Register dst, Register src) {
// Note: it will change flags
assert(Universe::narrow_klass_base() != NULL, "Base should be initialized");
assert (UseCompressedClassPointers, "should only be used for compressed headers");
if (dst == src) {
decode_klass_not_null(dst);
@ -5115,7 +5127,6 @@ void MacroAssembler::decode_klass_not_null(Register dst, Register src) {
// Cannot assert, unverified entry point counts instructions (see .ad file)
// vtableStubs also counts instructions in pd_code_size_limit.
// Also do not verify_oop as this is called by verify_oop.
mov64(dst, (int64_t)Universe::narrow_klass_base());
if (Universe::narrow_klass_shift() != 0) {
assert(LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong");