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[SimplifyLibCalls] Fix negative shifts being produced by the memchr -> bitfield transform.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232903 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2015-03-21 22:04:26 +00:00
parent fd48a80e14
commit 42a84b54bf
2 changed files with 15 additions and 1 deletions
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4
lib/Transforms/Utils/SimplifyLibCalls.cpp
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@ -782,7 +782,9 @@ Value *LibCallSimplifier::optimizeMemChr(CallInst *CI, IRBuilder<> &B) {
// memchr("\r\n", C, 2) != nullptr -> (C & ((1 << '\r') | (1 << '\n'))) != 0
// after bounds check.
if (!CharC && !Str.empty() && isOnlyUsedInZeroEqualityComparison(CI)) {
unsigned char Max = *std::max_element(Str.begin(), Str.end());
unsigned char Max =
*std::max_element(reinterpret_cast<const unsigned char *>(Str.begin()),
reinterpret_cast<const unsigned char *>(Str.end()));
// Make sure the bit field we're about to create fits in a register on the
// target.