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emit_x64_crc32: Improve PCLMULQDQ implementation of EmitCRC32ISO

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Remove use of pshufd
This commit is contained in:
MerryMage 2020-06-03 18:55:58 +01:00
parent fa6aee434e
commit 0f9c70ff42
1 changed files with 9 additions and 11 deletions
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20
src/backend/x64/emit_x64_crc32.cpp
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@ -47,20 +47,19 @@ static void EmitCRC32ISO(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst, co
code.movdqa(xmm_const, code.MConst(xword, 0x00000001'F7011641, 0x00000001'DB710641));
code.pxor(xmm_value, xmm_crc);
code.psllq(xmm_value, 64 - data_size);
if (data_size < 32) {
code.pslld(xmm_value, 32 - data_size);
code.psllq(xmm_crc, 32 - data_size);
code.pslldq(xmm_crc, (64 - data_size) / 8);
}
code.pclmulqdq(xmm_value, xmm_const, 0x00);
code.pshufd(xmm_value, xmm_value, 0b11111100);
code.pclmulqdq(xmm_value, xmm_const, 0x10);
if (data_size < 32) {
code.pxor(xmm_value, xmm_crc);
}
code.pextrd(crc, xmm_value, 1);
code.pextrd(crc, xmm_value, 2);
ctx.reg_alloc.DefineValue(inst, crc);
return;
@ -73,25 +72,24 @@ static void EmitCRC32ISO(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst, co
const Xbyak::Xmm xmm_value = ctx.reg_alloc.ScratchXmm();
const Xbyak::Xmm xmm_const = ctx.reg_alloc.ScratchXmm();
code.movd(xmm_value, value.cvt32());
code.movq(xmm_value, value);
code.movd(xmm_crc, crc);
code.movdqa(xmm_const, code.MConst(xword, 0x00000001'F7011641, 0x00000001'DB710641));
code.pxor(xmm_value, xmm_crc);
code.pslldq(xmm_value, 4);
code.movdqa(xmm_crc, xmm_value);
code.pclmulqdq(xmm_value, xmm_const, 0x00);
code.pshufd(xmm_value, xmm_value, 0b11111100);
code.pclmulqdq(xmm_value, xmm_const, 0x10);
code.movq(xmm_crc, value);
code.pxor(xmm_value, xmm_crc);
code.pshufd(xmm_value, xmm_value, 0b11111101);
code.psllq(xmm_value, 32);
code.pclmulqdq(xmm_value, xmm_const, 0x00);
code.pshufd(xmm_value, xmm_value, 0b11111100);
code.pclmulqdq(xmm_value, xmm_const, 0x01);
code.pclmulqdq(xmm_value, xmm_const, 0x10);
code.pextrd(crc, xmm_value, 1);
code.pextrd(crc, xmm_value, 2);
ctx.reg_alloc.DefineValue(inst, crc);
return;