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Avoid replacing the value of a directly stored load with the stored value if the load is indexed. rdar://9117613. 

llvm-svn: 127440
This commit is contained in:
Evan Cheng 2011-03-11 00:48:56 +00:00
parent 24e99aa833
commit adb9c03e41
2 changed files with 48 additions and 2 deletions
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3
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -5862,8 +5862,7 @@ SDValue DAGCombiner::visitLOAD(SDNode *N) {
// value. // value.
// TODO: Handle store large -> read small portion. // TODO: Handle store large -> read small portion.
// TODO: Handle TRUNCSTORE/LOADEXT // TODO: Handle TRUNCSTORE/LOADEXT
if (LD->getExtensionType() == ISD::NON_EXTLOAD && if (ISD::isNormalLoad(N) && !LD->isVolatile()) {
!LD->isVolatile()) {
if (ISD::isNON_TRUNCStore(Chain.getNode())) { if (ISD::isNON_TRUNCStore(Chain.getNode())) {
StoreSDNode *PrevST = cast<StoreSDNode>(Chain); StoreSDNode *PrevST = cast<StoreSDNode>(Chain);
if (PrevST->getBasePtr() == Ptr && if (PrevST->getBasePtr() == Ptr &&

47
llvm/test/CodeGen/ARM/2011-03-10-DAGCombineCrash.ll Normal file
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@ -0,0 +1,47 @@
; RUN: llc < %s -mtriple=thumbv7-apple-darwin10 -relocation-model=pic -disable-fp-elim -mcpu=cortex-a8
; rdar://9117613
%struct.mo = type { i32, %struct.mo_pops* }
%struct.mo_pops = type { void (%struct.mo*)*, void (%struct.mo*)*, i32 (%struct.mo*, i32*, i32)*, i32 (%struct.mo*)*, i32 (%struct.mo*, i64, i32, i32, i32*, i64, i32)*, i32 (%struct.mo*, i64, i32, i64*, i32*, i32, i32, i32)*, i32 (%struct.mo*, i64, i32)*, i32 (%struct.mo*, i64, i64, i32)*, i32 (%struct.mo*, i64, i64, i32)*, i32 (%struct.mo*, i32)*, i32 (%struct.mo*)*, i32 (%struct.mo*, i32)*, i8* }
%struct.ui = type { %struct.mo*, i32*, i32, i32*, i32*, i64, i32*, i32*, i32* }
define internal fastcc i32 @t(i32* %vp, i32 %withfsize, i64 %filesize) nounwind {
entry:
br i1 undef, label %bb1, label %bb
bb: ; preds = %entry
unreachable
bb1: ; preds = %entry
%0 = call %struct.ui* @vn_pp_to_ui(i32* undef) nounwind
call void @llvm.memset.p0i8.i32(i8* undef, i8 0, i32 40, i32 4, i1 false)
%1 = getelementptr inbounds %struct.ui* %0, i32 0, i32 0
store %struct.mo* undef, %struct.mo** %1, align 4
%2 = getelementptr inbounds %struct.ui* %0, i32 0, i32 5
%3 = load i64* %2, align 4
%4 = call i32 @mo_create_nnm(%struct.mo* undef, i64 %3, i32** undef) nounwind
br i1 undef, label %bb3, label %bb2
bb2: ; preds = %bb1
unreachable
bb3: ; preds = %bb1
br i1 undef, label %bb4, label %bb6
bb4: ; preds = %bb3
%5 = call i32 @vn_size(i32* %vp, i64* %2, i32* undef) nounwind
unreachable
bb6: ; preds = %bb3
ret i32 0
}
declare %struct.ui* @vn_pp_to_ui(i32*)
declare void @llvm.memset.p0i8.i32(i8* nocapture, i8, i32, i32, i1) nounwind
declare i32 @mo_create_nnm(%struct.mo*, i64, i32**)
declare i32 @vn_size(i32*, i64*, i32*)