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6827605: new String intrinsics may prevent EA scalar replacement

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6875866: Intrinsic for String.indexOf() is broken on x86 with SSE4.2

Modify String intrinsic methods to pass char[] pointers instead of string oops.

Reviewed-by: never
This commit is contained in:
Vladimir Kozlov 2009-09-14 12:14:20 -07:00
parent c492f4cde5
commit 243514d483
13 changed files with 788 additions and 1214 deletions
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47
hotspot/src/cpu/sparc/vm/assembler_sparc.cpp
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@ -4676,3 +4676,50 @@ void MacroAssembler::reinit_heapbase() {
load_ptr_contents(base, G6_heapbase);
}
}
// Compare char[] arrays aligned to 4 bytes.
void MacroAssembler::char_arrays_equals(Register ary1, Register ary2,
Register limit, Register result,
Register chr1, Register chr2, Label& Ldone) {
Label Lvector, Lloop;
assert(chr1 == result, "should be the same");
// Note: limit contains number of bytes (2*char_elements) != 0.
andcc(limit, 0x2, chr1); // trailing character ?
br(Assembler::zero, false, Assembler::pt, Lvector);
delayed()->nop();
// compare the trailing char
sub(limit, sizeof(jchar), limit);
lduh(ary1, limit, chr1);
lduh(ary2, limit, chr2);
cmp(chr1, chr2);
br(Assembler::notEqual, true, Assembler::pt, Ldone);
delayed()->mov(G0, result); // not equal
// only one char ?
br_on_reg_cond(rc_z, true, Assembler::pn, limit, Ldone);
delayed()->add(G0, 1, result); // zero-length arrays are equal
// word by word compare, dont't need alignment check
bind(Lvector);
// Shift ary1 and ary2 to the end of the arrays, negate limit
add(ary1, limit, ary1);
add(ary2, limit, ary2);
neg(limit, limit);
lduw(ary1, limit, chr1);
bind(Lloop);
lduw(ary2, limit, chr2);
cmp(chr1, chr2);
br(Assembler::notEqual, true, Assembler::pt, Ldone);
delayed()->mov(G0, result); // not equal
inccc(limit, 2*sizeof(jchar));
// annul LDUW if branch is not taken to prevent access past end of array
br(Assembler::notZero, true, Assembler::pt, Lloop);
delayed()->lduw(ary1, limit, chr1); // hoisted
// Caller should set it:
// add(G0, 1, result); // equals
}