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Merge pull request #7828 from unknownbrackets/arm64-minor

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arm64: Handle negative MOVI2F more correctly
This commit is contained in:
Henrik Rydgård
2015-06-28 14:14:51 +02:00
parent 3471eabcea f355600c20
commit 457992c683
1 changed files with 8 additions and 0 deletions
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Common/Arm64Emitter.cpp
+8
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@@ -3562,13 +3562,21 @@ void ARM64FloatEmitter::MOVI2F(ARM64Reg Rd, float value, ARM64Reg scratch, bool
_assert_msg_(JIT, !IsDouble(Rd), "MOVI2F does not yet support double precision");
uint8_t imm8;
if (value == 0.0) {
if (std::signbit(value)) {
negate = !negate;
}
FMOV(Rd, IsDouble(Rd) ? ZR : WZR);
if (negate) {
FNEG(Rd, Rd);
}
// TODO: There are some other values we could generate with the float-imm instruction, like 1.0...
} else if (negate && FPImm8FromFloat(-value, &imm8)) {
FMOV(Rd, imm8);
} else if (FPImm8FromFloat(value, &imm8)) {
FMOV(Rd, imm8);
if (negate) {
FNEG(Rd, Rd);
}
} else {
_assert_msg_(JIT, scratch != INVALID_REG, "Failed to find a way to generate FP immediate %f without scratch", value);
u32 ival;