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

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

llvm-svn: 129198

1 files changed, 49 insertions, 0 deletions

diff --git a/llvm/test/Transforms/LICM/2011-04-09-RAUW-AST.ll b/llvm/test/Transforms/LICM/2011-04-09-RAUW-AST.ll
new file mode 100644
index 00000000000..4285bd19e5f
--- /dev/null
+++ b/llvm/test/Transforms/LICM/2011-04-09-RAUW-AST.ll
@@ -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
+