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A64: Implement FMLA/FMLS' half-precision scalar indexed variants

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Lioncash 2019-04-13 02:08:20 -04:00 committed by MerryMage
parent d6606deda2
commit 1fdd3ef8a0
2 changed files with 44 additions and 2 deletions
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4
src/frontend/A64/decoder/a64.inc
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@ -538,9 +538,9 @@ INST(FCVTZU_fix_1, "FCVTZU (vector, fixed-point)", "01111
INST(SQDMULL_elt_1, "SQDMULL, SQDMULL2 (by element)", "01011111zzLMmmmm1011H0nnnnnddddd")
INST(SQDMULH_elt_1, "SQDMULH (by element)", "01011111zzLMmmmm1100H0nnnnnddddd")
INST(SQRDMULH_elt_1, "SQRDMULH (by element)", "01011111zzLMmmmm1101H0nnnnnddddd")
//INST(FMLA_elt_1, "FMLA (by element)", "0101111100LMmmmm0001H0nnnnnddddd")
INST(FMLA_elt_1, "FMLA (by element)", "0101111100LMmmmm0001H0nnnnnddddd")
INST(FMLA_elt_2, "FMLA (by element)", "010111111zLMmmmm0001H0nnnnnddddd")
//INST(FMLS_elt_1, "FMLS (by element)", "0101111100LMmmmm0101H0nnnnnddddd")
INST(FMLS_elt_1, "FMLS (by element)", "0101111100LMmmmm0101H0nnnnnddddd")
INST(FMLS_elt_2, "FMLS (by element)", "010111111zLMmmmm0101H0nnnnnddddd")
//INST(FMUL_elt_1, "FMUL (by element)", "0101111100LMmmmm1001H0nnnnnddddd")
INST(FMUL_elt_2, "FMUL (by element)", "010111111zLMmmmm1001H0nnnnnddddd")

42
src/frontend/A64/translate/impl/simd_scalar_x_indexed_element.cpp
View file

@ -58,12 +58,54 @@ bool MultiplyByElement(TranslatorVisitor& v, bool sz, Imm<1> L, Imm<1> M, Imm<4>
v.V_scalar(esize, Vd, result);
return true;
}
bool MultiplyByElementHalfPrecision(TranslatorVisitor& v, Imm<1> L, Imm<1> M, Imm<4> Vmlo, Imm<1> H,
Vec Vn, Vec Vd, ExtraBehavior extra_behavior) {
const size_t esize = 16;
const size_t idxsize = H == 1 ? 128 : 64;
const size_t index = concatenate(H, L, M).ZeroExtend();
const auto Vm = Vmlo.ZeroExtend<Vec>();
const IR::U16 element = v.ir.VectorGetElement(esize, v.V(idxsize, Vm), index);
const IR::U16 result = [&]() -> IR::U16 {
IR::U16 operand1 = v.V_scalar(esize, Vn);
// TODO: Currently we don't implement half-precision paths
// for regular multiplication and extended multiplication.
if (extra_behavior == ExtraBehavior::None) {
UNIMPLEMENTED();
}
if (extra_behavior == ExtraBehavior::MultiplyExtended) {
UNIMPLEMENTED();
}
if (extra_behavior == ExtraBehavior::Subtract) {
operand1 = v.ir.FPNeg(operand1);
}
const IR::U16 operand2 = v.V_scalar(esize, Vd);
return v.ir.FPMulAdd(operand2, operand1, element, true);
}();
v.V_scalar(esize, Vd, result);
return true;
}
} // Anonymous namespace
bool TranslatorVisitor::FMLA_elt_1(Imm<1> L, Imm<1> M, Imm<4> Vmlo, Imm<1> H, Vec Vn, Vec Vd) {
return MultiplyByElementHalfPrecision(*this, L, M, Vmlo, H, Vn, Vd, ExtraBehavior::Accumulate);
}
bool TranslatorVisitor::FMLA_elt_2(bool sz, Imm<1> L, Imm<1> M, Imm<4> Vmlo, Imm<1> H, Vec Vn, Vec Vd) {
return MultiplyByElement(*this, sz, L, M, Vmlo, H, Vn, Vd, ExtraBehavior::Accumulate);
}
bool TranslatorVisitor::FMLS_elt_1(Imm<1> L, Imm<1> M, Imm<4> Vmlo, Imm<1> H, Vec Vn, Vec Vd) {
return MultiplyByElementHalfPrecision(*this, L, M, Vmlo, H, Vn, Vd, ExtraBehavior::Subtract);
}
bool TranslatorVisitor::FMLS_elt_2(bool sz, Imm<1> L, Imm<1> M, Imm<4> Vmlo, Imm<1> H, Vec Vn, Vec Vd) {
return MultiplyByElement(*this, sz, L, M, Vmlo, H, Vn, Vd, ExtraBehavior::Subtract);
}