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8145717: Use AVX3 instructions for Arrays.equals() intrinsic

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Reviewed-by: kvn
This commit is contained in:
Jan Civlin 2015-12-18 15:29:43 -08:00 • committed by Vladimir Kozlov
parent 9e981ee107
commit eab2c9b57a
1 changed files with 41 additions and 1 deletions
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42
hotspot/src/cpu/x86/vm/macroAssembler_x86.cpp
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@ -8579,13 +8579,53 @@ void MacroAssembler::arrays_equals(bool is_array_equ, Register ary1, Register ar
// Compare 32-byte vectors
andl(result, 0x0000001f); // tail count (in bytes)
andl(limit, 0xffffffe0); // vector count (in bytes)
jccb(Assembler::zero, COMPARE_TAIL);
jcc(Assembler::zero, COMPARE_TAIL);
lea(ary1, Address(ary1, limit, Address::times_1));
lea(ary2, Address(ary2, limit, Address::times_1));
negptr(limit);
bind(COMPARE_WIDE_VECTORS);
#ifdef _LP64
if (VM_Version::supports_avx512vlbw()) { // trying 64 bytes fast loop
Label COMPARE_WIDE_VECTORS_LOOP_AVX2, COMPARE_WIDE_VECTORS_LOOP_AVX3;
cmpl(limit, -64);
jccb(Assembler::greater, COMPARE_WIDE_VECTORS_LOOP_AVX2);
bind(COMPARE_WIDE_VECTORS_LOOP_AVX3); // the hottest loop
evmovdquq(vec1, Address(ary1, limit, Address::times_1), Assembler::AVX_512bit);
evpcmpeqb(k7, vec1, Address(ary2, limit, Address::times_1), Assembler::AVX_512bit);
kortestql(k7, k7);
jcc(Assembler::aboveEqual, FALSE_LABEL); // miscompare
addptr(limit, 64); // update since we already compared at this addr
cmpl(limit, -64);
jccb(Assembler::lessEqual, COMPARE_WIDE_VECTORS_LOOP_AVX3);
// At this point we may still need to compare -limit+result bytes.
// We could execute the next two instruction and just continue via non-wide path:
// cmpl(limit, 0);
// jcc(Assembler::equal, COMPARE_TAIL); // true
// But since we stopped at the points ary{1,2}+limit which are
// not farther than 64 bytes from the ends of arrays ary{1,2}+result
// (|limit| <= 32 and result < 32),
// we may just compare the last 64 bytes.
//
addptr(result, -64); // it is safe, bc we just came from this area
evmovdquq(vec1, Address(ary1, result, Address::times_1), Assembler::AVX_512bit);
evpcmpeqb(k7, vec1, Address(ary2, result, Address::times_1), Assembler::AVX_512bit);
kortestql(k7, k7);
jcc(Assembler::aboveEqual, FALSE_LABEL); // miscompare
jmp(TRUE_LABEL);
bind(COMPARE_WIDE_VECTORS_LOOP_AVX2);
}//if (VM_Version::supports_avx512vlbw())
#endif //_LP64
vmovdqu(vec1, Address(ary1, limit, Address::times_1));
vmovdqu(vec2, Address(ary2, limit, Address::times_1));
vpxor(vec1, vec2);