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emit_x64: Eliminate conversion of GE flags

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* We do this so that we can simplify PackedSelect.
* We also try to minimise xmm-gpr/gpr-xmm transfers in PackedSelect.
This commit is contained in:
MerryMage 2017-11-25 17:34:39 +00:00
parent f734d7000e
commit 305e4baa29
1 changed files with 80 additions and 73 deletions
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131
src/backend_x64/emit_x64.cpp
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@ -330,9 +330,23 @@ void EmitX64::EmitOrQFlag(RegAlloc& reg_alloc, IR::Block&, IR::Inst* inst) {
void EmitX64::EmitGetGEFlags(RegAlloc& reg_alloc, IR::Block&, IR::Inst* inst) {
Xbyak::Reg32 result = reg_alloc.ScratchGpr().cvt32();
Xbyak::Reg32 tmp;
if (code->DoesCpuSupport(Xbyak::util::Cpu::tBMI2)) {
tmp = reg_alloc.ScratchGpr().cvt32();
code->mov(tmp, 0x01010101);
}
code->mov(result, MJitStateCpsr());
code->shr(result, 16);
if (code->DoesCpuSupport(Xbyak::util::Cpu::tBMI2)) {
code->pdep(result, result, tmp);
} else {
code->and_(result, 0xF);
code->imul(result, result, 0x00204081);
code->and_(result, 0x01010101);
}
code->imul(result, result, 0xFF);
reg_alloc.DefineValue(inst, result);
}
@ -340,18 +354,23 @@ void EmitX64::EmitSetGEFlags(RegAlloc& reg_alloc, IR::Block&, IR::Inst* inst) {
constexpr size_t flag_bit = 16;
constexpr u32 flag_mask = 0xFu << flag_bit;
auto args = reg_alloc.GetArgumentInfo(inst);
if (args[0].IsImmediate()) {
u32 imm = (args[0].GetImmediateU32() << flag_bit) & flag_mask;
code->and_(MJitStateCpsr(), ~flag_mask);
code->or_(MJitStateCpsr(), imm);
} else {
ASSERT(!args[0].IsImmediate());
Xbyak::Reg32 to_store = reg_alloc.UseScratchGpr(args[0]).cvt32();
if (code->DoesCpuSupport(Xbyak::util::Cpu::tBMI2)) {
Xbyak::Reg32 tmp = reg_alloc.ScratchGpr().cvt32();
code->mov(tmp, 0x80808080);
code->pext(to_store, to_store, tmp);
} else {
code->and_(to_store, 0x80808080);
code->imul(to_store, to_store, 0x00204081);
code->shr(to_store, 28);
}
code->shl(to_store, flag_bit);
code->and_(to_store, flag_mask);
code->and_(MJitStateCpsr(), ~flag_mask);
code->or_(MJitStateCpsr(), to_store);
}
}
void EmitX64::EmitBXWritePC(RegAlloc& reg_alloc, IR::Block&, IR::Inst* inst) {
@ -1444,40 +1463,16 @@ void EmitX64::EmitSignedSaturation(RegAlloc& reg_alloc, IR::Block& block, IR::In
}
}
/**
* Extracts the most significant bits from each of the packed bytes, and packs them together.
*
* value before: a-------b-------c-------d-------
* value after: 0000000000000000000000000000abcd
*
* @param value The register containing the value to operate on. Result will be stored in the same register.
* @param a_tmp A register which can be used as a scratch register.
*/
static void ExtractMostSignificantBitFromPackedBytes(BlockOfCode* code, RegAlloc& reg_alloc, Xbyak::Reg32 value, boost::optional<Xbyak::Reg32> a_tmp = boost::none) {
if (code->DoesCpuSupport(Xbyak::util::Cpu::tBMI2)) {
Xbyak::Reg32 tmp = a_tmp ? *a_tmp : reg_alloc.ScratchGpr().cvt32();
code->mov(tmp, 0x80808080);
code->pext(value, value, tmp);
} else {
static void MaskOfMostSignificantBitFromPackedBytes(BlockOfCode* code, RegAlloc&, Xbyak::Reg32 value, boost::optional<Xbyak::Reg32> = boost::none) {
code->and_(value, 0x80808080);
code->imul(value, value, 0x00204081);
code->shr(value, 28);
}
code->shr(value, 7);
code->imul(value, value, 0xFF);
}
/**
* Extracts the most significant bits from each of the packed words, duplicates them, and packs them together.
*
* value before: a---------------b---------------
* value after: 0000000000000000000000000000aabb
*
* @param value The register containing the value to operate on. Result will be stored in the same register.
*/
static void ExtractAndDuplicateMostSignificantBitFromPackedWords(BlockOfCode* code, Xbyak::Reg32 value) {
static void MaskOfMostSignificantBitFromPackedWords(BlockOfCode* code, Xbyak::Reg32 value) {
code->and_(value, 0x80008000);
code->shr(value, 1);
code->imul(value, value, 0xC003);
code->shr(value, 28);
code->shr(value, 15);
code->imul(value, value, 0xFFFF);
}
void EmitX64::EmitPackedAddU8(RegAlloc& reg_alloc, IR::Block& block, IR::Inst* inst) {
@ -1501,7 +1496,6 @@ void EmitX64::EmitPackedAddU8(RegAlloc& reg_alloc, IR::Block& block, IR::Inst* i
code->movd(reg_ge, tmp);
code->not_(reg_ge);
ExtractMostSignificantBitFromPackedBytes(code, reg_alloc, reg_ge);
reg_alloc.DefineValue(ge_inst, reg_ge);
}
@ -1532,7 +1526,7 @@ void EmitX64::EmitPackedAddS8(RegAlloc& reg_alloc, IR::Block& block, IR::Inst* i
if (ge_inst) {
code->not_(reg_ge);
ExtractMostSignificantBitFromPackedBytes(code, reg_alloc, reg_ge);
MaskOfMostSignificantBitFromPackedBytes(code, reg_alloc, reg_ge);
reg_alloc.DefineValue(ge_inst, reg_ge);
}
@ -1571,7 +1565,6 @@ void EmitX64::EmitPackedAddU16(RegAlloc& reg_alloc, IR::Block& block, IR::Inst*
code->movd(reg_ge, tmp_b);
}
ExtractMostSignificantBitFromPackedBytes(code, reg_alloc, reg_ge);
reg_alloc.DefineValue(ge_inst, reg_ge);
}
@ -1601,7 +1594,7 @@ void EmitX64::EmitPackedAddS16(RegAlloc& reg_alloc, IR::Block& block, IR::Inst*
if (ge_inst) {
code->not_(reg_ge);
ExtractAndDuplicateMostSignificantBitFromPackedWords(code, reg_ge);
MaskOfMostSignificantBitFromPackedWords(code, reg_ge);
reg_alloc.DefineValue(ge_inst, reg_ge);
}
@ -1626,15 +1619,12 @@ void EmitX64::EmitPackedSubU8(RegAlloc& reg_alloc, IR::Block& block, IR::Inst* i
code->pmaxub(xmm_ge, xmm_b);
code->pcmpeqb(xmm_ge, xmm_a);
code->movd(reg_ge, xmm_ge);
reg_alloc.DefineValue(ge_inst, reg_ge);
}
code->psubb(xmm_a, xmm_b);
if (ge_inst) {
ExtractMostSignificantBitFromPackedBytes(code, reg_alloc, reg_ge);
reg_alloc.DefineValue(ge_inst, reg_ge);
}
reg_alloc.DefineValue(inst, xmm_a);
}
@ -1662,7 +1652,7 @@ void EmitX64::EmitPackedSubS8(RegAlloc& reg_alloc, IR::Block& block, IR::Inst* i
if (ge_inst) {
code->not_(reg_ge);
ExtractMostSignificantBitFromPackedBytes(code, reg_alloc, reg_ge);
MaskOfMostSignificantBitFromPackedBytes(code, reg_alloc, reg_ge);
reg_alloc.DefineValue(ge_inst, reg_ge);
}
@ -1697,15 +1687,12 @@ void EmitX64::EmitPackedSubU16(RegAlloc& reg_alloc, IR::Block& block, IR::Inst*
code->movd(reg_ge, xmm_ge);
code->not_(reg_ge);
}
reg_alloc.DefineValue(ge_inst, reg_ge);
}
code->psubw(xmm_a, xmm_b);
if (ge_inst) {
ExtractAndDuplicateMostSignificantBitFromPackedWords(code, reg_ge);
reg_alloc.DefineValue(ge_inst, reg_ge);
}
reg_alloc.DefineValue(inst, xmm_a);
}
@ -1732,7 +1719,7 @@ void EmitX64::EmitPackedSubS16(RegAlloc& reg_alloc, IR::Block& block, IR::Inst*
if (ge_inst) {
code->not_(reg_ge);
ExtractAndDuplicateMostSignificantBitFromPackedWords(code, reg_ge);
MaskOfMostSignificantBitFromPackedWords(code, reg_ge);
reg_alloc.DefineValue(ge_inst, reg_ge);
}
@ -2022,15 +2009,16 @@ void EmitPackedSubAdd(BlockOfCode* code, RegAlloc& reg_alloc, IR::Block& block,
if (!is_signed) {
code->shl(ge_sum, 15);
code->sar(ge_sum, 16);
code->sar(ge_sum, 31);
} else {
code->not_(ge_sum);
code->sar(ge_sum, 31);
}
code->not_(ge_diff);
code->and_(ge_sum, hi_is_sum ? 0xC0000000 : 0x30000000);
code->and_(ge_diff, hi_is_sum ? 0x30000000 : 0xC0000000);
code->sar(ge_diff, 31);
code->and_(ge_sum, hi_is_sum ? 0xFFFF0000 : 0x0000FFFF);
code->and_(ge_diff, hi_is_sum ? 0x0000FFFF : 0xFFFF0000);
code->or_(ge_sum, ge_diff);
code->shr(ge_sum, 28);
reg_alloc.DefineValue(ge_inst, ge_sum);
}
@ -2131,19 +2119,38 @@ void EmitX64::EmitPackedAbsDiffSumS8(RegAlloc& reg_alloc, IR::Block&, IR::Inst*
void EmitX64::EmitPackedSelect(RegAlloc& reg_alloc, IR::Block&, IR::Inst* inst) {
auto args = reg_alloc.GetArgumentInfo(inst);
Xbyak::Reg32 ge = reg_alloc.UseScratchGpr(args[0]).cvt32();
if (args[1].IsInXmm() && args[2].IsInXmm()) {
Xbyak::Xmm ge = reg_alloc.UseScratchXmm(args[0]);
Xbyak::Xmm to = reg_alloc.UseXmm(args[1]);
Xbyak::Xmm from = reg_alloc.UseScratchXmm(args[2]);
code->pand(from, ge);
code->pandn(ge, to);
code->por(from, ge);
reg_alloc.DefineValue(inst, from);
} else if (code->DoesCpuSupport(Xbyak::util::Cpu::tBMI1)) {
Xbyak::Reg32 ge = reg_alloc.UseGpr(args[0]).cvt32();
Xbyak::Reg32 to = reg_alloc.UseScratchGpr(args[1]).cvt32();
Xbyak::Reg32 from = reg_alloc.UseScratchGpr(args[2]).cvt32();
Xbyak::Reg32 tmp = reg_alloc.ScratchGpr().cvt32();
code->mov(tmp, 0x01010101);
code->pdep(ge, ge, tmp);
code->imul(ge, ge, 0xFF);
code->and_(from, ge);
code->andn(to, ge, to);
code->or_(from, to);
reg_alloc.DefineValue(inst, from);
} else {
Xbyak::Reg32 ge = reg_alloc.UseScratchGpr(args[0]).cvt32();
Xbyak::Reg32 to = reg_alloc.UseScratchGpr(args[1]).cvt32();
Xbyak::Reg32 from = reg_alloc.UseScratchGpr(args[2]).cvt32();
code->and_(from, ge);
code->not_(ge);
code->and_(to, ge);
code->or_(from, to);
reg_alloc.DefineValue(inst, from);
}
}
static void DenormalsAreZero32(BlockOfCode* code, Xbyak::Xmm xmm_value, Xbyak::Reg32 gpr_scratch) {