maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

Make sure to use signed arithmetic in APInt to fix a regression. 

llvm-svn: 71090
This commit is contained in:
David Greene 2009-05-06 17:39:26 +00:00
parent 9a6fef0a52
commit 0dec5b9a75
1 changed files with 3 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
View File

@ -2027,9 +2027,10 @@ ICmpInst *LoopStrengthReduce::ChangeCompareStride(Loop *L, ICmpInst *Cond,
Scale = SSInt / CmpSSInt;
int64_t NewCmpVal = CmpVal * Scale;
APInt Mul = APInt(BitWidth, NewCmpVal);
APInt Mul = APInt(BitWidth*2, CmpVal, true);
Mul = Mul * APInt(BitWidth*2, Scale, true);
// Check for overflow.
if (Mul.getSExtValue() != NewCmpVal)
if (!Mul.isSignedIntN(BitWidth)) {
continue;
// Watch out for overflow.