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fix PR7429, a crash turning a load from a string into a float.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108113 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-07-12 00:22:51 +00:00
parent ddef83536c
commit eae2895120
2 changed files with 22 additions and 3 deletions
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12
lib/Analysis/ConstantFolding.cpp
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@ -436,8 +436,10 @@ Constant *llvm::ConstantFoldLoadFromConstPtr(Constant *C,
unsigned StrLen = Str.length();
const Type *Ty = cast<PointerType>(CE->getType())->getElementType();
unsigned NumBits = Ty->getPrimitiveSizeInBits();
// Replace LI with immediate integer store.
if ((NumBits >> 3) == StrLen + 1) {
// Replace load with immediate integer if the result is an integer or fp
// value.
if ((NumBits >> 3) == StrLen + 1 && (NumBits & 7) == 0 &&
isa<IntegerType>(Ty) || Ty->isFloatingPointTy()) {
APInt StrVal(NumBits, 0);
APInt SingleChar(NumBits, 0);
if (TD->isLittleEndian()) {
@ -454,7 +456,11 @@ Constant *llvm::ConstantFoldLoadFromConstPtr(Constant *C,
SingleChar = 0;
StrVal = (StrVal << 8) | SingleChar;
}
return ConstantInt::get(CE->getContext(), StrVal);
Constant *Res = ConstantInt::get(CE->getContext(), StrVal);
if (Ty->isFloatingPointTy())
Res = ConstantExpr::getBitCast(Res, Ty);
return Res;
}
}

13
test/Transforms/InstCombine/load3.ll
View File

@ -1,4 +1,6 @@
; RUN: opt < %s -instcombine -S | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-apple-darwin10.0.0"
; Instcombine should be able to do trivial CSE of loads.
@ -12,3 +14,14 @@ define i32 @test1(i32* %p) {
; CHECK: @test1
; CHECK: ret i32 0
}
; PR7429
@.str = private constant [4 x i8] c"XYZ\00"
define float @test2() {
%tmp = load float* bitcast ([4 x i8]* @.str to float*), align 1
ret float %tmp
; CHECK: @test2
; CHECK: ret float 0x3806965600000000
}