Merge pull request #7017 from lioncash/arm

Arm64Emitter: Use Common::BitCast where applicable
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Markus Wick 2018-05-30 09:50:59 +02:00 committed by GitHub
commit 4bebd52850
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1 changed files with 22 additions and 23 deletions

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@ -11,6 +11,7 @@
#include "Common/Align.h" #include "Common/Align.h"
#include "Common/Arm64Emitter.h" #include "Common/Arm64Emitter.h"
#include "Common/Assert.h" #include "Common/Assert.h"
#include "Common/BitUtils.h"
#include "Common/CommonTypes.h" #include "Common/CommonTypes.h"
#include "Common/MathUtil.h" #include "Common/MathUtil.h"
@ -268,35 +269,34 @@ bool IsImmLogical(uint64_t value, unsigned int width, unsigned int* n, unsigned
return true; return true;
} }
float FPImm8ToFloat(uint8_t bits) float FPImm8ToFloat(u8 bits)
{ {
int sign = bits >> 7; const u32 sign = bits >> 7;
uint32_t f = (sign << 31); const u32 bit6 = (bits >> 6) & 1;
int bit6 = (bits >> 6) & 1; const u32 exp = ((!bit6) << 7) | (0x7C * bit6) | ((bits >> 4) & 3);
uint32_t exp = ((!bit6) << 7) | (0x7C * bit6) | ((bits >> 4) & 3); const u32 mantissa = (bits & 0xF) << 19;
uint32_t mantissa = (bits & 0xF) << 19; const u32 f = (sign << 31) | (exp << 23) | mantissa;
f |= exp << 23;
f |= mantissa; return Common::BitCast<float>(f);
float fl;
memcpy(&fl, &f, sizeof(float));
return fl;
} }
bool FPImm8FromFloat(float value, uint8_t* immOut) bool FPImm8FromFloat(float value, u8* imm_out)
{ {
uint32_t f; const u32 f = Common::BitCast<u32>(value);
memcpy(&f, &value, sizeof(float)); const u32 mantissa4 = (f & 0x7FFFFF) >> 19;
uint32_t mantissa4 = (f & 0x7FFFFF) >> 19; const u32 exponent = (f >> 23) & 0xFF;
uint32_t exponent = (f >> 23) & 0xFF; const u32 sign = f >> 31;
uint32_t sign = f >> 31;
if ((exponent >> 7) == ((exponent >> 6) & 1)) if ((exponent >> 7) == ((exponent >> 6) & 1))
return false; return false;
uint8_t imm8 = (sign << 7) | ((!(exponent >> 7)) << 6) | ((exponent & 3) << 4) | mantissa4;
float newFloat = FPImm8ToFloat(imm8); const u8 imm8 = (sign << 7) | ((!(exponent >> 7)) << 6) | ((exponent & 3) << 4) | mantissa4;
if (newFloat == value) const float new_float = FPImm8ToFloat(imm8);
*immOut = imm8; if (new_float == value)
*imm_out = imm8;
else else
return false; return false;
return true; return true;
} }
} // Anonymous namespace } // Anonymous namespace
@ -4346,11 +4346,10 @@ void ARM64FloatEmitter::MOVI2F(ARM64Reg Rd, float value, ARM64Reg scratch, bool
{ {
ASSERT_MSG(DYNA_REC, scratch != INVALID_REG, ASSERT_MSG(DYNA_REC, scratch != INVALID_REG,
"Failed to find a way to generate FP immediate %f without scratch", value); "Failed to find a way to generate FP immediate %f without scratch", value);
u32 ival;
if (negate) if (negate)
value = -value; value = -value;
memcpy(&ival, &value, sizeof(ival)); const u32 ival = Common::BitCast<u32>(value);
m_emit->MOVI2R(scratch, ival); m_emit->MOVI2R(scratch, ival);
FMOV(Rd, scratch); FMOV(Rd, scratch);
} }