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Make sure the buffer, which containas an instance of APFloat, has proper alignment.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170486 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Shuxin Yang 2012-12-19 01:10:17 +00:00
parent 5469f605fe
commit d6b51d1dc1
1 changed files with 5 additions and 7 deletions
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12
lib/Transforms/InstCombine/InstCombineAddSub.cpp
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@ -65,11 +65,11 @@ namespace {
private: private:
bool insaneIntVal(int V) { return V > 4 || V < -4; } bool insaneIntVal(int V) { return V > 4 || V < -4; }
APFloat *getFpValPtr(void) APFloat *getFpValPtr(void)
{ return reinterpret_cast<APFloat*>(&FpValBuf[0]); } { return reinterpret_cast<APFloat*>(&FpValBuf.buffer[0]); }
const APFloat &getFpVal(void) const { const APFloat &getFpVal(void) const {
assert(IsFp && BufHasFpVal && "Incorret state"); assert(IsFp && BufHasFpVal && "Incorret state");
return *reinterpret_cast<const APFloat*>(&FpValBuf[0]); return *reinterpret_cast<const APFloat*>(&FpValBuf.buffer[0]);
} }
APFloat &getFpVal(void) APFloat &getFpVal(void)
@ -78,6 +78,7 @@ namespace {
bool isInt() const { return !IsFp; } bool isInt() const { return !IsFp; }
private: private:
bool IsFp; bool IsFp;
// True iff FpValBuf contains an instance of APFloat. // True iff FpValBuf contains an instance of APFloat.
@ -88,11 +89,8 @@ namespace {
// two instructions. So the range of <IntVal> falls in [-4, 4]. APInt // two instructions. So the range of <IntVal> falls in [-4, 4]. APInt
// is overkill of this end. // is overkill of this end.
short IntVal; short IntVal;
union { AlignedCharArrayUnion<APFloat> FpValBuf;
char FpValBuf[sizeof(APFloat)];
int dummy; // So this structure has at least 4-byte alignment.
};
}; };
/// FAddend is used to represent floating-point addend. An addend is /// FAddend is used to represent floating-point addend. An addend is