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A64: Handle half-precision floating point in FCVTN

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Now that we have IR instructions for performing conversions with
half-precision floating point, we can also handle half-precision values
within FCVTN.
This commit is contained in:
Lioncash 2019-03-23 12:32:01 -04:00 committed by MerryMage
parent 16de99d3e3
commit fac9224d5e
1 changed files with 13 additions and 8 deletions
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21
src/frontend/A64/translate/impl/simd_two_register_misc.cpp
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@ -362,22 +362,27 @@ bool TranslatorVisitor::FCVTL(bool Q, bool sz, Vec Vn, Vec Vd) {
}
bool TranslatorVisitor::FCVTN(bool Q, bool sz, Vec Vn, Vec Vd) {
// Half-precision not handled directly.
if (!sz) {
return InterpretThisInstruction();
}
const size_t datasize = 64;
const size_t esize = sz ? 32 : 16;
const size_t num_elements = datasize / esize;
const IR::U128 operand = V(128, Vn);
const auto rounding_mode = ir.current_location->FPCR().RMode();
IR::U128 result = ir.ZeroVector();
for (size_t i = 0; i < 2; i++) {
const IR::U32 element = ir.FPDoubleToSingle(ir.VectorGetElement(64, operand, i), rounding_mode);
for (size_t i = 0; i < num_elements; i++) {
IR::U16U32U64 element = ir.VectorGetElement(2 * esize, operand, i);
result = ir.VectorSetElement(32, result, i, element);
if (esize == 16) {
element = ir.FPSingleToHalf(element, rounding_mode);
} else if (esize == 32) {
element = ir.FPDoubleToSingle(element, rounding_mode);
}
result = ir.VectorSetElement(esize, result, i, element);
}
Vpart(64, Vd, Q, result);
Vpart(datasize, Vd, Q, result);
return true;
}