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Fix PR5551 by not ignoring the top level constantexpr when

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folding a load from constant.

llvm-svn: 90545
This commit is contained in:
Chris Lattner 2009-12-04 06:29:29 +00:00
parent 269f4c1c24
commit 107fc93d48
2 changed files with 10 additions and 1 deletions
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2
lib/Analysis/ConstantFolding.cpp
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@ -432,7 +432,7 @@ Constant *llvm::ConstantFoldLoadFromConstPtr(Constant *C,
// Instead of loading constant c string, use corresponding integer value
// directly if string length is small enough.
std::string Str;
if (TD && GetConstantStringInfo(CE->getOperand(0), Str) && !Str.empty()) {
if (TD && GetConstantStringInfo(CE, Str) && !Str.empty()) {
unsigned StrLen = Str.length();
const Type *Ty = cast<PointerType>(CE->getType())->getElementType();
unsigned NumBits = Ty->getPrimitiveSizeInBits();

9
test/Transforms/ConstProp/loads.ll
View File

@ -101,3 +101,12 @@ entry:
}
; PR5551
@test12g = private constant [6 x i8] c"a\00b\00\00\00"
define i16 @test12() {
%a = load i16* getelementptr inbounds ([3 x i16]* bitcast ([6 x i8]* @test12g to [3 x i16]*), i32 0, i64 1)
ret i16 %a
; CHECK: @test12
; CHECK: ret i16 98
}