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Bug 950703 - IonMonkey: Read only 4 bytes for a FLOAT32_STACK entry. r=jandem

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This commit is contained in:
Dan Gohman 2013-12-17 08:49:15 -08:00
parent 3ce0423592
commit 914e897d2c
1 changed files with 13 additions and 15 deletions
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28
js/src/jit/IonFrames.cpp
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@ -53,6 +53,12 @@ ReadFrameDoubleSlot(IonJSFrameLayout *fp, int32_t slot)
return *(double *)((char *)fp + OffsetOfFrameSlot(slot));
}
static inline double
ReadFrameFloat32Slot(IonJSFrameLayout *fp, int32_t slot)
{
return *(float *)((char *)fp + OffsetOfFrameSlot(slot));
}
static inline int32_t
ReadFrameInt32Slot(IonJSFrameLayout *fp, int32_t slot)
{
@ -1321,11 +1327,6 @@ SnapshotIterator::slotReadable(const Slot &slot)
}
}
typedef union {
double d;
float f;
} PunDoubleFloat;
Value
SnapshotIterator::slotValue(const Slot &slot)
{
@ -1335,21 +1336,18 @@ SnapshotIterator::slotValue(const Slot &slot)
case SnapshotReader::FLOAT32_REG:
{
PunDoubleFloat pdf;
pdf.d = machine_.read(slot.floatReg());
union {
double d;
float f;
} pun;
pun.d = machine_.read(slot.floatReg());
// The register contains the encoding of a float32. We just read
// the bits without making any conversion.
float asFloat = pdf.f;
return DoubleValue(asFloat);
return Float32Value(pun.f);
}
case SnapshotReader::FLOAT32_STACK:
{
PunDoubleFloat pdf;
pdf.d = ReadFrameDoubleSlot(fp_, slot.stackSlot());
float asFloat = pdf.f; // no conversion, see comment above.
return DoubleValue(asFloat);
}
return Float32Value(ReadFrameFloat32Slot(fp_, slot.stackSlot()));
case SnapshotReader::TYPED_REG:
return FromTypedPayload(slot.knownType(), machine_.read(slot.reg()));