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Fix a bug in GetKnownAlignment of packed structs.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40649 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lauro Ramos Venancio 2007-07-31 20:13:21 +00:00
parent b1576f56c8
commit c7d1114ade
2 changed files with 32 additions and 3 deletions
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8
lib/Transforms/Scalar/InstructionCombining.cpp
View File

@ -7533,11 +7533,13 @@ static unsigned GetKnownAlignment(Value *V, TargetData *TD) {
const Type *BasePtrTy = GEPI->getOperand(0)->getType();
const PointerType *PtrTy = cast<PointerType>(BasePtrTy);
if (TD->getABITypeAlignment(PtrTy->getElementType())
<= BaseAlignment) {
unsigned Align = TD->getABITypeAlignment(PtrTy->getElementType());
if (Align <= BaseAlignment) {
const Type *GEPTy = GEPI->getType();
const PointerType *GEPPtrTy = cast<PointerType>(GEPTy);
return TD->getABITypeAlignment(GEPPtrTy->getElementType());
Align = std::min(Align, (unsigned)
TD->getABITypeAlignment(GEPPtrTy->getElementType()));
return Align;
}
return 0;
}

27
test/Transforms/InstCombine/known_align.ll Normal file
View File

@ -0,0 +1,27 @@
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {align 1}
; END.
%struct.p = type <{ i8, i32 }>
@t = global %struct.p <{ i8 1, i32 10 }> ; <%struct.p*> [#uses=1]
@u = weak global %struct.p zeroinitializer ; <%struct.p*> [#uses=1]
define i32 @main() {
entry:
%retval = alloca i32, align 4 ; <i32*> [#uses=2]
%tmp = alloca i32, align 4 ; <i32*> [#uses=2]
%tmp1 = alloca i32, align 4 ; <i32*> [#uses=3]
%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
%tmp3 = load i32* getelementptr (%struct.p* @t, i32 0, i32 1), align 1 ; <i32> [#uses=1]
store i32 %tmp3, i32* %tmp1, align 4
%tmp5 = load i32* %tmp1, align 4 ; <i32> [#uses=1]
store i32 %tmp5, i32* getelementptr (%struct.p* @u, i32 0, i32 1), align 1
%tmp6 = load i32* %tmp1, align 4 ; <i32> [#uses=1]
store i32 %tmp6, i32* %tmp, align 4
%tmp7 = load i32* %tmp, align 4 ; <i32> [#uses=1]
store i32 %tmp7, i32* %retval, align 4
br label %return
return: ; preds = %entry
%retval8 = load i32* %retval ; <i32> [#uses=1]
ret i32 %retval8
}