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simplify-libcalls: fold strstr(a, b) == a -> strncmp(a, b, strlen(b)) == 0

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106047 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2010-06-15 21:34:25 +00:00
parent 2bbaf4d06e
commit 386e918438
4 changed files with 72 additions and 0 deletions
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25
lib/Transforms/Utils/BuildLibCalls.cpp
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@@ -69,6 +69,31 @@ Value *llvm::EmitStrChr(Value *Ptr, char C, IRBuilder<> &B,
return CI;
}
/// EmitStrNCmp - Emit a call to the strncmp function to the builder.
Value *llvm::EmitStrNCmp(Value *Ptr1, Value *Ptr2, Value *Len,
IRBuilder<> &B, const TargetData *TD) {
Module *M = B.GetInsertBlock()->getParent()->getParent();
AttributeWithIndex AWI[3];
AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture);
AWI[1] = AttributeWithIndex::get(2, Attribute::NoCapture);
AWI[2] = AttributeWithIndex::get(~0u, Attribute::ReadOnly |
Attribute::NoUnwind);
LLVMContext &Context = B.GetInsertBlock()->getContext();
Value *StrNCmp = M->getOrInsertFunction("strncmp", AttrListPtr::get(AWI, 3),
B.getInt32Ty(),
B.getInt8PtrTy(),
B.getInt8PtrTy(),
TD->getIntPtrType(Context), NULL);
CallInst *CI = B.CreateCall3(StrNCmp, CastToCStr(Ptr1, B),
CastToCStr(Ptr2, B), Len, "strncmp");
if (const Function *F = dyn_cast<Function>(StrNCmp->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
/// EmitStrCpy - Emit a call to the strcpy function to the builder, for the
/// specified pointer arguments.
Value *llvm::EmitStrCpy(Value *Dst, Value *Src, IRBuilder<> &B,