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JIT - fctidz: Properly saturate

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Dr. Chat
2017-03-06 01:06:32 -06:00
parent d8ed251ad1
commit 098d23c3d4
2 changed files with 117 additions and 0 deletions
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20
src/xenia/cpu/backend/x64/x64_sequences.cc
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@@ -1453,12 +1453,32 @@ struct CONVERT_I32_F64
struct CONVERT_I64_F64
: Sequence<CONVERT_I64_F64, I<OPCODE_CONVERT, I64Op, F64Op>> {
static void Emit(X64Emitter& e, const EmitArgType& i) {
// Copy src1.
e.movq(e.rcx, i.src1);
// TODO(benvanik): saturation check? cvtt* (trunc?)
if (i.instr->flags == ROUND_TO_ZERO) {
e.vcvttsd2si(i.dest, i.src1);
} else {
e.vcvtsd2si(i.dest, i.src1);
}
// 0x8000000000000000
e.mov(e.rax, 0x1);
e.shl(e.rax, 63);
// Saturate positive overflow
// TODO(DrChat): Find a shorter equivalent sequence.
// if (result ind. && src1 >= 0)
// result = 0x7FFFFFFFFFFFFFFF;
e.cmp(e.rax, i.dest);
e.sete(e.al);
e.movzx(e.rax, e.al);
e.shr(e.rcx, 63);
e.xor_(e.rcx, 0x01);
e.and_(e.rax, e.rcx);
e.sub(i.dest, e.rax);
}
};
struct CONVERT_F32_I32