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Merge pull request #9712 from JosJuice/jitarm64-fmul-rounding

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JitArm64: Fix fmul rounding issues
This commit is contained in:
Mai M 2021-05-20 10:25:02 -04:00 committed by GitHub
commit 1054abc9cc
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GPG key ID: 4AEE18F83AFDEB23
6 changed files with 177 additions and 34 deletions
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39
Source/Core/Common/Arm64Emitter.cpp
View file

@ -2294,6 +2294,15 @@ void ARM64FloatEmitter::EmitScalar2Source(bool M, bool S, u32 type, u32 opcode,
(opcode << 12) | (1 << 11) | (DecodeReg(Rn) << 5) | DecodeReg(Rd));
}
void ARM64FloatEmitter::EmitScalarThreeSame(bool U, u32 size, u32 opcode, ARM64Reg Rd, ARM64Reg Rn,
ARM64Reg Rm)
{
ASSERT_MSG(DYNA_REC, !IsQuad(Rd), "%s only supports double and single registers!", __func__);
Write32((1 << 30) | (U << 29) | (0b11110001 << 21) | (size << 22) | (DecodeReg(Rm) << 16) |
(opcode << 11) | (1 << 10) | (DecodeReg(Rn) << 5) | DecodeReg(Rd));
}
void ARM64FloatEmitter::EmitThreeSame(bool U, u32 size, u32 opcode, ARM64Reg Rd, ARM64Reg Rn,
ARM64Reg Rm)
{
@ -3118,6 +3127,11 @@ void ARM64FloatEmitter::FRSQRTE(ARM64Reg Rd, ARM64Reg Rn)
}
// Scalar - 2 Source
void ARM64FloatEmitter::ADD(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm)
{
ASSERT_MSG(DYNA_REC, IsDouble(Rd), "%s only supports double registers!", __func__);
EmitScalarThreeSame(0, 3, 0b10000, Rd, Rn, Rm);
}
void ARM64FloatEmitter::FADD(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm)
{
EmitScalar2Source(0, 0, IsDouble(Rd), 2, Rd, Rn, Rm);
@ -3189,10 +3203,18 @@ void ARM64FloatEmitter::FMOV(ARM64Reg Rd, uint8_t imm8)
}
// Vector
void ARM64FloatEmitter::ADD(u8 size, ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm)
{
EmitThreeSame(0, size >> 6, 0b10000, Rd, Rn, Rm);
}
void ARM64FloatEmitter::AND(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm)
{
EmitThreeSame(0, 0, 3, Rd, Rn, Rm);
}
void ARM64FloatEmitter::BIC(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm)
{
EmitThreeSame(0, 1, 3, Rd, Rn, Rm);
}
void ARM64FloatEmitter::BSL(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm)
{
EmitThreeSame(1, 1, 3, Rd, Rn, Rm);
@ -3300,6 +3322,10 @@ void ARM64FloatEmitter::ORR(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm)
{
EmitThreeSame(0, 2, 3, Rd, Rn, Rm);
}
void ARM64FloatEmitter::ORN(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm)
{
EmitThreeSame(0, 3, 3, Rd, Rn, Rm);
}
void ARM64FloatEmitter::REV16(u8 size, ARM64Reg Rd, ARM64Reg Rn)
{
Emit2RegMisc(IsQuad(Rd), 0, size >> 4, 1, Rd, Rn);
@ -3879,11 +3905,10 @@ void ARM64FloatEmitter::MOVI(u8 size, ARM64Reg Rd, u64 imm, u8 shift)
EncodeModImm(Q, op, cmode, 0, Rd, abcdefgh);
}
void ARM64FloatEmitter::BIC(u8 size, ARM64Reg Rd, u8 imm, u8 shift)
void ARM64FloatEmitter::ORR_BIC(u8 size, ARM64Reg Rd, u8 imm, u8 shift, u8 op)
{
bool Q = IsQuad(Rd);
u8 cmode = 1;
u8 op = 1;
if (size == 16)
{
ASSERT_MSG(DYNA_REC, shift == 0 || shift == 8, "%s(size16) only supports shift of {0, 8}!",
@ -3919,6 +3944,16 @@ void ARM64FloatEmitter::BIC(u8 size, ARM64Reg Rd, u8 imm, u8 shift)
EncodeModImm(Q, op, cmode, 0, Rd, imm);
}
void ARM64FloatEmitter::ORR(u8 size, ARM64Reg Rd, u8 imm, u8 shift)
{
ORR_BIC(size, Rd, imm, shift, 0);
}
void ARM64FloatEmitter::BIC(u8 size, ARM64Reg Rd, u8 imm, u8 shift)
{
ORR_BIC(size, Rd, imm, shift, 1);
}
void ARM64FloatEmitter::ABI_PushRegisters(BitSet32 registers, ARM64Reg tmp)
{
bool bundled_loadstore = false;

8
Source/Core/Common/Arm64Emitter.h
View file

@ -1000,6 +1000,7 @@ public:
void FRSQRTE(ARM64Reg Rd, ARM64Reg Rn);
// Scalar - 2 Source
void ADD(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm);
void FADD(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm);
void FMUL(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm);
void FSUB(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm);
@ -1020,7 +1021,9 @@ public:
void FMOV(ARM64Reg Rd, uint8_t imm8);
// Vector
void ADD(u8 size, ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm);
void AND(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm);
void BIC(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm);
void BSL(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm);
void DUP(u8 size, ARM64Reg Rd, ARM64Reg Rn, u8 index);
void FABS(u8 size, ARM64Reg Rd, ARM64Reg Rn);
@ -1043,6 +1046,7 @@ public:
void FSUB(u8 size, ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm);
void NOT(ARM64Reg Rd, ARM64Reg Rn);
void ORR(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm);
void ORN(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm);
void MOV(ARM64Reg Rd, ARM64Reg Rn) { ORR(Rd, Rn, Rn); }
void REV16(u8 size, ARM64Reg Rd, ARM64Reg Rn);
void REV32(u8 size, ARM64Reg Rd, ARM64Reg Rn);
@ -1128,6 +1132,7 @@ public:
// Modified Immediate
void MOVI(u8 size, ARM64Reg Rd, u64 imm, u8 shift = 0);
void ORR(u8 size, ARM64Reg Rd, u8 imm, u8 shift = 0);
void BIC(u8 size, ARM64Reg Rd, u8 imm, u8 shift = 0);
void MOVI2F(ARM64Reg Rd, float value, ARM64Reg scratch = ARM64Reg::INVALID_REG,
@ -1145,6 +1150,7 @@ private:
void EmitLoadStoreImmediate(u8 size, u32 opc, IndexType type, ARM64Reg Rt, ARM64Reg Rn, s32 imm);
void EmitScalar2Source(bool M, bool S, u32 type, u32 opcode, ARM64Reg Rd, ARM64Reg Rn,
ARM64Reg Rm);
void EmitScalarThreeSame(bool U, u32 size, u32 opcode, ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm);
void EmitThreeSame(bool U, u32 size, u32 opcode, ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm);
void EmitCopy(bool Q, u32 op, u32 imm5, u32 imm4, ARM64Reg Rd, ARM64Reg Rn);
void EmitScalar2RegMisc(bool U, u32 size, u32 opcode, ARM64Reg Rd, ARM64Reg Rn);
@ -1178,6 +1184,8 @@ private:
void EncodeLoadStoreRegisterOffset(u32 size, bool load, ARM64Reg Rt, ARM64Reg Rn, ArithOption Rm);
void EncodeModImm(bool Q, u8 op, u8 cmode, u8 o2, ARM64Reg Rd, u8 abcdefgh);
void ORR_BIC(u8 size, ARM64Reg Rd, u8 imm, u8 shift, u8 op);
void SSHLL(u8 src_size, ARM64Reg Rd, ARM64Reg Rn, u32 shift, bool upper);
void USHLL(u8 src_size, ARM64Reg Rd, ARM64Reg Rn, u32 shift, bool upper);
void SHRN(u8 dest_size, ARM64Reg Rd, ARM64Reg Rn, u32 shift, bool upper);

2
Source/Core/Core/PowerPC/JitArm64/Jit.h
View file

@ -270,6 +270,8 @@ protected:
bool Rc = false);
void SetFPRFIfNeeded(bool single, Arm64Gen::ARM64Reg reg);
void Force25BitPrecision(Arm64Gen::ARM64Reg output, Arm64Gen::ARM64Reg input,
Arm64Gen::ARM64Reg temp);
// <Fastmem fault location, slowmem handler location>
std::map<const u8*, FastmemArea> m_fault_to_handler;

61
Source/Core/Core/PowerPC/JitArm64/JitArm64_FloatingPoint.cpp
View file

@ -39,6 +39,29 @@ void JitArm64::SetFPRFIfNeeded(bool single, ARM64Reg reg)
gpr.Unlock(ARM64Reg::W0, ARM64Reg::W1, ARM64Reg::W2, ARM64Reg::W3, ARM64Reg::W4, ARM64Reg::W30);
}
// Emulate the odd truncation/rounding that the PowerPC does on the RHS operand before
// a single precision multiply. To be precise, it drops the low 28 bits of the mantissa,
// rounding to nearest as it does.
void JitArm64::Force25BitPrecision(ARM64Reg output, ARM64Reg input, ARM64Reg temp)
{
ASSERT(output != input && output != temp && input != temp);
// temp = 0x0000'0000'0800'0000ULL
// output = 0xFFFF'FFFF'F800'0000ULL
m_float_emit.MOVI(32, temp, 0x08, 24);
m_float_emit.MOVI(64, output, 0xFFFF'FFFF'0000'0000ULL);
m_float_emit.BIC(temp, temp, output);
m_float_emit.ORR(32, output, 0xF8, 24);
// output = (input & ~0xFFFFFFF) + ((input & (1ULL << 27)) << 1)
m_float_emit.AND(temp, input, temp);
m_float_emit.AND(output, input, output);
if (IsQuad(input))
m_float_emit.ADD(64, output, output, temp);
else
m_float_emit.ADD(output, output, temp);
}
void JitArm64::fp_arith(UGeckoInstruction inst)
{
INSTRUCTION_START
@ -51,8 +74,11 @@ void JitArm64::fp_arith(UGeckoInstruction inst)
bool single = inst.OPCD == 59;
bool packed = inst.OPCD == 4;
bool use_c = op5 >= 25; // fmul and all kind of fmaddXX
bool use_b = op5 != 25; // fmul uses no B
const bool use_c = op5 >= 25; // fmul and all kind of fmaddXX
const bool use_b = op5 != 25; // fmul uses no B
const bool outputs_are_singles = single || packed;
const bool round_c = use_c && outputs_are_singles && !js.op->fprIsSingle[inst.FC];
const auto inputs_are_singles_func = [&] {
return fpr.IsSingle(a, !packed) && (!use_b || fpr.IsSingle(b, !packed)) &&
@ -62,6 +88,8 @@ void JitArm64::fp_arith(UGeckoInstruction inst)
ARM64Reg VA{}, VB{}, VC{}, VD{};
ARM64Reg V0Q = ARM64Reg::INVALID_REG;
if (packed)
{
const RegType type = inputs_are_singles ? RegType::Single : RegType::Register;
@ -75,6 +103,19 @@ void JitArm64::fp_arith(UGeckoInstruction inst)
VC = reg_encoder(fpr.R(c, type));
VD = reg_encoder(fpr.RW(d, type));
if (round_c)
{
ASSERT_MSG(DYNA_REC, !inputs_are_singles, "Tried to apply 25-bit precision to single");
V0Q = fpr.GetReg();
const ARM64Reg V1Q = fpr.GetReg();
Force25BitPrecision(reg_encoder(V0Q), VC, reg_encoder(V1Q));
VC = reg_encoder(V0Q);
fpr.Unlock(V1Q);
}
switch (op5)
{
case 18:
@ -110,6 +151,19 @@ void JitArm64::fp_arith(UGeckoInstruction inst)
VC = reg_encoder(fpr.R(c, type));
VD = reg_encoder(fpr.RW(d, type_out));
if (round_c)
{
ASSERT_MSG(DYNA_REC, !inputs_are_singles, "Tried to apply 25-bit precision to single");
V0Q = fpr.GetReg();
const ARM64Reg V1Q = fpr.GetReg();
Force25BitPrecision(reg_encoder(V0Q), VC, reg_encoder(V1Q));
VC = reg_encoder(V0Q);
fpr.Unlock(V1Q);
}
switch (op5)
{
case 18:
@ -142,7 +196,8 @@ void JitArm64::fp_arith(UGeckoInstruction inst)
}
}
const bool outputs_are_singles = single || packed;
if (V0Q != ARM64Reg::INVALID_REG)
fpr.Unlock(V0Q);
if (outputs_are_singles)
{

65
Source/Core/Core/PowerPC/JitArm64/JitArm64_Paired.cpp
View file

@ -84,16 +84,35 @@ void JitArm64::ps_mulsX(UGeckoInstruction inst)
const bool upper = inst.SUBOP5 == 13;
const bool singles = fpr.IsSingle(a) && fpr.IsSingle(c);
const bool round_c = !js.op->fprIsSingle[inst.FC];
const RegType type = singles ? RegType::Single : RegType::Register;
const u8 size = singles ? 32 : 64;
const auto reg_encoder = singles ? EncodeRegToDouble : EncodeRegToQuad;
const ARM64Reg VA = fpr.R(a, type);
const ARM64Reg VC = fpr.R(c, type);
ARM64Reg VC = fpr.R(c, type);
const ARM64Reg VD = fpr.RW(d, type);
ARM64Reg V0Q = ARM64Reg::INVALID_REG;
if (round_c)
{
ASSERT_MSG(DYNA_REC, !singles, "Tried to apply 25-bit precision to single");
V0Q = fpr.GetReg();
const ARM64Reg V1Q = fpr.GetReg();
Force25BitPrecision(reg_encoder(V0Q), reg_encoder(VC), reg_encoder(V1Q));
VC = reg_encoder(V0Q);
fpr.Unlock(V1Q);
}
m_float_emit.FMUL(size, reg_encoder(VD), reg_encoder(VA), reg_encoder(VC), upper ? 1 : 0);
if (V0Q != ARM64Reg::INVALID_REG)
fpr.Unlock(V0Q);
ASSERT_MSG(DYNA_REC, singles == (fpr.IsSingle(a) && fpr.IsSingle(c)),
"Register allocation turned singles into doubles in the middle of ps_mulsX");
@ -115,31 +134,45 @@ void JitArm64::ps_maddXX(UGeckoInstruction inst)
const u32 op5 = inst.SUBOP5;
const bool singles = fpr.IsSingle(a) && fpr.IsSingle(b) && fpr.IsSingle(c);
const bool round_c = !js.op->fprIsSingle[inst.FC];
const RegType type = singles ? RegType::Single : RegType::Register;
const u8 size = singles ? 32 : 64;
const auto reg_encoder = singles ? EncodeRegToDouble : EncodeRegToQuad;
const ARM64Reg VA = reg_encoder(fpr.R(a, type));
const ARM64Reg VB = reg_encoder(fpr.R(b, type));
const ARM64Reg VC = reg_encoder(fpr.R(c, type));
ARM64Reg VC = reg_encoder(fpr.R(c, type));
const ARM64Reg VD = reg_encoder(fpr.RW(d, type));
ARM64Reg V0Q = ARM64Reg::INVALID_REG;
ARM64Reg V0 = ARM64Reg::INVALID_REG;
if (d != b && (d == a || d == c))
ARM64Reg V1Q = ARM64Reg::INVALID_REG;
if (round_c || (d != b && (d == a || d == c)))
{
V0Q = fpr.GetReg();
V0 = reg_encoder(V0Q);
}
if (round_c)
{
ASSERT_MSG(DYNA_REC, !singles, "Tried to apply 25-bit precision to single");
V1Q = fpr.GetReg();
Force25BitPrecision(reg_encoder(V1Q), VC, V0);
VC = reg_encoder(V1Q);
}
switch (op5)
{
case 14: // ps_madds0
// d = a * c.ps0 + b
if (d == b)
if (VD == VB)
{
m_float_emit.FMLA(size, VD, VA, VC, 0);
}
else if (d != a && d != c)
else if (VD != VA && VD != VC)
{
m_float_emit.MOV(VD, VB);
m_float_emit.FMLA(size, VD, VA, VC, 0);
@ -153,11 +186,11 @@ void JitArm64::ps_maddXX(UGeckoInstruction inst)
break;
case 15: // ps_madds1
// d = a * c.ps1 + b
if (d == b)
if (VD == VB)
{
m_float_emit.FMLA(size, VD, VA, VC, 1);
}
else if (d != a && d != c)
else if (VD != VA && VD != VC)
{
m_float_emit.MOV(VD, VB);
m_float_emit.FMLA(size, VD, VA, VC, 1);
@ -171,14 +204,14 @@ void JitArm64::ps_maddXX(UGeckoInstruction inst)
break;
case 28: // ps_msub
// d = a * c - b
if (d == b)
if (VD == VB)
{
// d = -(-a * c + b)
// rounding is incorrect if the rounding mode is +/- infinity
m_float_emit.FMLS(size, VD, VA, VC);
m_float_emit.FNEG(size, VD, VD);
}
else if (d != a && d != c)
else if (VD != VA && VD != VC)
{
m_float_emit.FNEG(size, VD, VB);
m_float_emit.FMLA(size, VD, VA, VC);
@ -192,11 +225,11 @@ void JitArm64::ps_maddXX(UGeckoInstruction inst)
break;
case 29: // ps_madd
// d = a * c + b
if (d == b)
if (VD == VB)
{
m_float_emit.FMLA(size, VD, VA, VC);
}
else if (d != a && d != c)
else if (VD != VA && VD != VC)
{
m_float_emit.MOV(VD, VB);
m_float_emit.FMLA(size, VD, VA, VC);
@ -215,11 +248,11 @@ void JitArm64::ps_maddXX(UGeckoInstruction inst)
// Note: PowerPC rounds before the final negation.
// We don't handle this at the moment because it's
// only relevant when rounding to +/- infinity.
if (d == b)
if (VD == VB)
{
m_float_emit.FMLS(size, VD, VA, VC);
}
else if (d != a && d != c)
else if (VD != VA && VD != VC)
{
m_float_emit.MOV(VD, VB);
m_float_emit.FMLS(size, VD, VA, VC);
@ -233,12 +266,12 @@ void JitArm64::ps_maddXX(UGeckoInstruction inst)
break;
case 31: // ps_nmadd
// d = -(a * c + b)
if (d == b)
if (VD == VB)
{
m_float_emit.FMLA(size, VD, VA, VC);
m_float_emit.FNEG(size, VD, VD);
}
else if (d != a && d != c)
else if (VD != VA && VD != VC)
{
// d = -a * c - b
// See rounding note at ps_nmsub.
@ -259,6 +292,8 @@ void JitArm64::ps_maddXX(UGeckoInstruction inst)
if (V0Q != ARM64Reg::INVALID_REG)
fpr.Unlock(V0Q);
if (V1Q != ARM64Reg::INVALID_REG)
fpr.Unlock(V1Q);
ASSERT_MSG(DYNA_REC, singles == (fpr.IsSingle(a) && fpr.IsSingle(b) && fpr.IsSingle(c)),
"Register allocation turned singles into doubles in the middle of ps_maddXX");

36
Source/Core/Core/PowerPC/PPCAnalyst.cpp
View file

@ -979,7 +979,19 @@ u32 PPCAnalyzer::Analyze(u32 address, CodeBlock* block, CodeBuffer* buffer, std:
op.fprIsStoreSafeBeforeInst = fprIsStoreSafe;
if (op.fregOut >= 0)
{
if (op.opinfo->type == OpType::SingleFP)
BitSet32 bitexact_inputs;
if (op.opinfo->flags &
(FL_IN_FLOAT_A_BITEXACT | FL_IN_FLOAT_B_BITEXACT | FL_IN_FLOAT_C_BITEXACT))
{
if (op.opinfo->flags & FL_IN_FLOAT_A_BITEXACT)
bitexact_inputs[op.inst.FA] = true;
if (op.opinfo->flags & FL_IN_FLOAT_B_BITEXACT)
bitexact_inputs[op.inst.FB] = true;
if (op.opinfo->flags & FL_IN_FLOAT_C_BITEXACT)
bitexact_inputs[op.inst.FC] = true;
}
if (op.opinfo->type == OpType::SingleFP || !strncmp(op.opinfo->opname, "frsp", 4))
{
fprIsSingle[op.fregOut] = true;
fprIsDuplicated[op.fregOut] = true;
@ -989,6 +1001,11 @@ u32 PPCAnalyzer::Analyze(u32 address, CodeBlock* block, CodeBuffer* buffer, std:
fprIsSingle[op.fregOut] = true;
fprIsDuplicated[op.fregOut] = true;
}
else if (bitexact_inputs)
{
fprIsSingle[op.fregOut] = (fprIsSingle & bitexact_inputs) == bitexact_inputs;
fprIsDuplicated[op.fregOut] = false;
}
else if (op.opinfo->type == OpType::PS || op.opinfo->type == OpType::LoadPS)
{
fprIsSingle[op.fregOut] = true;
@ -1007,20 +1024,10 @@ u32 PPCAnalyzer::Analyze(u32 address, CodeBlock* block, CodeBuffer* buffer, std:
// So, discard all information we have.
fprIsStoreSafe = BitSet32(0);
}
else if (op.opinfo->flags &
(FL_IN_FLOAT_A_BITEXACT | FL_IN_FLOAT_B_BITEXACT | FL_IN_FLOAT_C_BITEXACT))
else if (bitexact_inputs)
{
// If the instruction copies bits between registers (without flushing denormals to zero
// or turning SNaN into QNaN), the output is store-safe if the inputs are.
BitSet32 bitexact_inputs;
if (op.opinfo->flags & FL_IN_FLOAT_A_BITEXACT)
bitexact_inputs[op.inst.FA] = true;
if (op.opinfo->flags & FL_IN_FLOAT_B_BITEXACT)
bitexact_inputs[op.inst.FB] = true;
if (op.opinfo->flags & FL_IN_FLOAT_C_BITEXACT)
bitexact_inputs[op.inst.FC] = true;
fprIsStoreSafe[op.fregOut] = (fprIsStoreSafe & bitexact_inputs) == bitexact_inputs;
}
else
@ -1032,8 +1039,9 @@ u32 PPCAnalyzer::Analyze(u32 address, CodeBlock* block, CodeBuffer* buffer, std:
// TODO: if we go directly from a load to a float instruction, and the value isn't used
// for anything else, we can use fast single -> double conversion after the load.
fprIsStoreSafe[op.fregOut] =
(op.opinfo->type == OpType::SingleFP || op.opinfo->type == OpType::PS);
fprIsStoreSafe[op.fregOut] = op.opinfo->type == OpType::SingleFP ||
op.opinfo->type == OpType::PS ||
!strncmp(op.opinfo->opname, "frsp", 4);
}
}
op.fprIsStoreSafeAfterInst = fprIsStoreSafe;