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shader: Simplify FLO and throw on CC

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This commit is contained in:
ReinUsesLisp 2021-04-11 20:54:51 -03:00 committed by ameerj
parent dfd5341d71
commit 415c7e46ed
1 changed files with 13 additions and 12 deletions
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25
src/shader_recompiler/frontend/maxwell/translate/impl/find_leading_one.cpp
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@ -8,26 +8,27 @@
namespace Shader::Maxwell {
namespace {
void FLO(TranslatorVisitor& v, u64 insn, const IR::U32& src) {
void FLO(TranslatorVisitor& v, u64 insn, IR::U32 src) {
union {
u64 insn;
BitField<0, 8, IR::Reg> dest_reg;
BitField<40, 1, u64> tilde;
BitField<41, 1, u64> shift;
BitField<47, 1, u64> cc;
BitField<48, 1, u64> is_signed;
} const flo{insn};
const bool invert{flo.tilde != 0};
const bool is_signed{flo.is_signed != 0};
const bool shift_op{flo.shift != 0};
const IR::U32 operand{invert ? v.ir.BitwiseNot(src) : src};
const IR::U32 find_result{is_signed ? v.ir.FindSMsb(operand) : v.ir.FindUMsb(operand)};
const IR::U1 find_fail{v.ir.IEqual(find_result, v.ir.Imm32(-1))};
const IR::U32 offset{v.ir.Imm32(31)};
const IR::U32 success_result{shift_op ? IR::U32{v.ir.ISub(offset, find_result)} : find_result};
const IR::U32 result{v.ir.Select(find_fail, find_result, success_result)};
if (flo.cc != 0) {
throw NotImplementedException("CC");
}
if (flo.tilde != 0) {
src = v.ir.BitwiseNot(src);
}
IR::U32 result{flo.is_signed != 0 ? v.ir.FindSMsb(src) : v.ir.FindUMsb(src)};
if (flo.shift != 0) {
const IR::U1 not_found{v.ir.IEqual(result, v.ir.Imm32(-1))};
result = IR::U32{v.ir.Select(not_found, result, v.ir.BitwiseXor(result, v.ir.Imm32(31)))};
}
v.X(flo.dest_reg, result);
}
} // Anonymous namespace