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Stop APInt::shl from generating llvm.trap

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APInt::shl generated llvm.trap to guard against shifts greater than bit-width.
This was already checked with an assert, and there was a special case for
shifts equal to bit-width. Modify this check to catch shifts greater than or
equal to bit-width, so llvm.trap isn't generated.

Patch contributed by JF Bastien

llvm-svn: 166803
This commit is contained in:
Derek Schuff 2012-10-26 19:52:27 +00:00
parent 9cb3d9d08c
commit e93c168939
1 changed files with 1 additions and 1 deletions
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2
include/llvm/ADT/APInt.h
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@ -760,7 +760,7 @@ public:
APInt shl(unsigned shiftAmt) const {
assert(shiftAmt <= BitWidth && "Invalid shift amount");
if (isSingleWord()) {
if (shiftAmt == BitWidth)
if (shiftAmt >= BitWidth)
return APInt(BitWidth, 0); // avoid undefined shift results
return APInt(BitWidth, VAL << shiftAmt);
}