6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2026-04-21 08:17:40 +00:00
Code Issues Projects Releases Wiki Activity

fix an off-by-one bug that caused a crash analyzing

Browse Source 
ashr's with huge shift amounts, PR8896


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122814 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2011-01-04 18:19:15 +00:00
parent ba64b9706a
commit 43b40a4620
2 changed files with 38 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/Analysis/ValueTracking.cpp
+1 -1
View File
@@ -337,7 +337,7 @@ void llvm::ComputeMaskedBits(Value *V, const APInt &Mask,
// (ashr X, C1) & C2 == 0 iff (-1 >> C1) & C2 == 0
if (ConstantInt *SA = dyn_cast<ConstantInt>(I->getOperand(1))) {
// Compute the new bits that are at the top now.
uint64_t ShiftAmt = SA->getLimitedValue(BitWidth);
uint64_t ShiftAmt = SA->getLimitedValue(BitWidth-1);
// Signed shift right.
APInt Mask2(Mask.shl(ShiftAmt));