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emit_x64_crc32: Further improvements to codegen

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This commit is contained in:
MerryMage 2020-06-06 17:07:03 +01:00
parent bb203429c6
commit 66a356e6cb
1 changed files with 41 additions and 39 deletions
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80
src/backend/x64/emit_x64_crc32.cpp
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@ -35,30 +35,52 @@ static void EmitCRC32Castagnoli(BlockOfCode& code, EmitContext& ctx, IR::Inst* i
static void EmitCRC32ISO(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst, const int data_size) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
if (code.DoesCpuSupport(Xbyak::util::Cpu::tPCLMULQDQ) && data_size <= 32) {
if (code.DoesCpuSupport(Xbyak::util::Cpu::tPCLMULQDQ) && data_size < 32) {
const Xbyak::Reg32 crc = ctx.reg_alloc.UseScratchGpr(args[0]).cvt32();
const Xbyak::Reg64 value = ctx.reg_alloc.UseGpr(args[1]);
const Xbyak::Xmm xmm_crc = ctx.reg_alloc.ScratchXmm();
const Xbyak::Reg64 value = ctx.reg_alloc.UseScratchGpr(args[1]);
const Xbyak::Xmm xmm_value = ctx.reg_alloc.ScratchXmm();
const Xbyak::Xmm xmm_const = ctx.reg_alloc.ScratchXmm();
const Xbyak::Xmm xmm_tmp = ctx.reg_alloc.ScratchXmm();
code.movdqa(xmm_const, code.MConst(xword, 0x00000001'F7011641, 0x00000001'DB710641));
code.movzx(value.cvt32(), value.changeBit(data_size));
code.xor_(value.cvt32(), crc);
code.movd(xmm_tmp, value.cvt32());
code.pslldq(xmm_tmp, (64 - data_size) / 8);
if (code.DoesCpuSupport(Xbyak::util::Cpu::tAVX)) {
code.vpclmulqdq(xmm_value, xmm_tmp, xmm_const, 0x00);
code.pclmulqdq(xmm_value, xmm_const, 0x10);
code.pxor(xmm_value, xmm_tmp);
} else {
code.movdqa(xmm_value, xmm_tmp);
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);
ctx.reg_alloc.DefineValue(inst, crc);
return;
}
if (code.DoesCpuSupport(Xbyak::util::Cpu::tPCLMULQDQ) && data_size == 32) {
const Xbyak::Reg32 crc = ctx.reg_alloc.UseScratchGpr(args[0]).cvt32();
const Xbyak::Reg32 value = ctx.reg_alloc.UseGpr(args[1]).cvt32();
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.movd(xmm_crc, crc);
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.pslldq(xmm_crc, (64 - data_size) / 8);
}
code.xor_(crc, value);
code.shl(crc.cvt64(), 32);
code.movq(xmm_value, crc.cvt64());
code.pclmulqdq(xmm_value, xmm_const, 0x00);
code.pclmulqdq(xmm_value, xmm_const, 0x10);
if (data_size < 32) {
code.pxor(xmm_value, xmm_crc);
}
code.pextrd(crc, xmm_value, 2);
ctx.reg_alloc.DefineValue(inst, crc);
@ -67,39 +89,19 @@ 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_tmp = ctx.reg_alloc.ScratchXmm();
const Xbyak::Reg64 value = ctx.reg_alloc.UseGpr(args[1]);
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.movdqa(xmm_const, code.MConst(xword, 0xb4e5b025'f7011641, 0x00000001'DB710641));
code.mov(crc, crc);
code.xor_(value, crc.cvt64());
code.movq(xmm_value, value);
code.xor_(crc.cvt64(), value);
code.movq(xmm_value, crc.cvt64());
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, 0x00);
code.pclmulqdq(xmm_value, xmm_const, 0x10);
code.movdqa(xmm_const, code.MConst(xword, 0x00000001'F7011641, 0x00000001'DB710641));
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);
ctx.reg_alloc.DefineValue(inst, crc);