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emit_x64_crc32: Improve 64-bit PCLMULQDQ implementation of EmitCRC32ISO

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Reduce number of PCLMULQDQs to 3
This commit is contained in:
MerryMage 2020-06-04 19:06:25 +01:00
parent 0f9c70ff42
commit bcde135c23
1 changed files with 24 additions and 13 deletions
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37
src/backend/x64/emit_x64_crc32.cpp
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@ -68,26 +68,37 @@ static void EmitCRC32ISO(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst, co
if (code.DoesCpuSupport(Xbyak::util::Cpu::tPCLMULQDQ) && data_size == 64) {
const Xbyak::Reg32 crc = ctx.reg_alloc.UseScratchGpr(args[0]).cvt32();
const Xbyak::Reg64 value = ctx.reg_alloc.UseScratchGpr(args[1]);
const Xbyak::Xmm xmm_crc = ctx.reg_alloc.ScratchXmm();
const Xbyak::Xmm xmm_tmp = ctx.reg_alloc.ScratchXmm();
const Xbyak::Xmm xmm_value = ctx.reg_alloc.ScratchXmm();
const Xbyak::Xmm xmm_const = ctx.reg_alloc.ScratchXmm();
code.movdqa(xmm_const, code.MConst(xword, 0xFFFFFFFF00000000, 0x00000001'63CD6124));
code.mov(crc, crc);
code.xor_(value, crc.cvt64());
code.movq(xmm_value, value);
code.movd(xmm_crc, crc);
if (code.DoesCpuSupport(Xbyak::util::Cpu::tAVX)) {
code.vpand(xmm_tmp, xmm_value, xmm_const);
} else {
code.movdqa(xmm_tmp, xmm_value);
code.pand(xmm_tmp, xmm_const);
}
code.psllq(xmm_value, 32);
code.pclmulqdq(xmm_value, xmm_const, 0x10);
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.pclmulqdq(xmm_value, xmm_const, 0x10);
code.pxor(xmm_value, xmm_crc);
code.psllq(xmm_value, 32);
code.pclmulqdq(xmm_value, xmm_const, 0x01);
if (code.DoesCpuSupport(Xbyak::util::Cpu::tAVX)) {
code.pxor(xmm_tmp, xmm_value);
code.vpclmulqdq(xmm_value, xmm_tmp, xmm_const, 0x00);
} else {
code.pxor(xmm_value, xmm_tmp);
code.movdqa(xmm_tmp, xmm_value);
code.pclmulqdq(xmm_value, xmm_const, 0x00);
}
code.pclmulqdq(xmm_value, xmm_const, 0x10);
code.pxor(xmm_value, xmm_tmp);
code.pextrd(crc, xmm_value, 2);