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PR9604; try to deal with RAUW updates correctly in the AST. I'm not convinced

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it's completely safe to cache the AST across LICM runs even with this fix,
but this fix can't hurt.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129198 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman 2011-04-09 06:55:46 +00:00
parent 83d13a046f
commit 9055ccdb6b
3 changed files with 54 additions and 0 deletions
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1
include/llvm/Analysis/AliasSetTracker.h
View File

@ -284,6 +284,7 @@ class AliasSetTracker {
class ASTCallbackVH : public CallbackVH {
AliasSetTracker *AST;
virtual void deleted();
virtual void allUsesReplacedWith(Value *);
public:
ASTCallbackVH(Value *V, AliasSetTracker *AST = 0);
ASTCallbackVH &operator=(Value *V);

4
lib/Analysis/AliasSetTracker.cpp
View File

@ -602,6 +602,10 @@ void AliasSetTracker::ASTCallbackVH::deleted() {
// this now dangles!
}
void AliasSetTracker::ASTCallbackVH::allUsesReplacedWith(Value *V) {
AST->copyValue(getValPtr(), V);
}
AliasSetTracker::ASTCallbackVH::ASTCallbackVH(Value *V, AliasSetTracker *ast)
: CallbackVH(V), AST(ast) {}

49
test/Transforms/LICM/2011-04-09-RAUW-AST.ll Normal file
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@ -0,0 +1,49 @@
; RUN: opt < %s -loop-rotate -licm -S | FileCheck %s
; PR9604
@g_3 = global i32 0, align 4
@.str = private unnamed_addr constant [4 x i8] c"%d\0A\00"
define i32 @main() nounwind {
entry:
%tmp = load i32* @g_3, align 4
%tobool = icmp eq i32 %tmp, 0
br i1 %tobool, label %for.cond, label %if.then
if.then: ; preds = %entry
br label %for.cond
for.cond: ; preds = %for.inc10, %if.then, %entry
%g.0 = phi i32* [ %g.0, %for.inc10 ], [ @g_3, %entry ], [ null, %if.then ]
%x.0 = phi i32 [ %inc12, %for.inc10 ], [ 0, %entry ], [ 0, %if.then ]
%cmp = icmp slt i32 %x.0, 5
br i1 %cmp, label %for.cond4, label %for.end13
for.cond4: ; preds = %for.body7, %for.cond
%y.0 = phi i32 [ %inc, %for.body7 ], [ 0, %for.cond ]
%cmp6 = icmp slt i32 %y.0, 5
br i1 %cmp6, label %for.body7, label %for.inc10
; CHECK: for.body7:
; CHECK-NEXT: phi
; CHECK-NEXT: store i32 0
; CHECK-NEXT: store i32 1
for.body7: ; preds = %for.cond4
store i32 0, i32* @g_3, align 4
store i32 1, i32* %g.0, align 4
%inc = add nsw i32 %y.0, 1
br label %for.cond4
for.inc10: ; preds = %for.cond4
%inc12 = add nsw i32 %x.0, 1
br label %for.cond
for.end13: ; preds = %for.cond
%tmp14 = load i32* @g_3, align 4
%call = tail call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([4 x i8]* @.str, i64 0, i64 0), i32 %tmp14) nounwind
ret i32 0
}
declare i32 @printf(i8* nocapture, ...) nounwind