testcase for my previous commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60315 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/GVN/rle-must-alias.ll b/test/Transforms/GVN/rle-must-alias.ll
new file mode 100644 (file)
index 0000000..e507556
--- /dev/null
+++ b/test/Transforms/GVN/rle-must-alias.ll
@@ -0,0 +1,42 @@
+; RUN: llvm-as < %s | opt -gvn | llvm-dis | grep {DEAD.rle = phi i32}
+; The %7 and %4 loads combine to make %DEAD unneeded.
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
+target triple = "i386-apple-darwin7"
+@H = common global [100 x i32] zeroinitializer, align 32               ; <[100 x i32]*> [#uses=3]
+@G = common global i32 0               ; <i32*> [#uses=2]
+
+define i32 @test(i32 %i) nounwind {
+entry:
+       %0 = tail call i32 (...)* @foo() nounwind               ; <i32> [#uses=1]
+       %1 = icmp eq i32 %0, 0          ; <i1> [#uses=1]
+       br i1 %1, label %bb1, label %bb
+
+bb:            ; preds = %entry
+       %2 = tail call i32 (...)* @bar() nounwind               ; <i32> [#uses=0]
+       %3 = getelementptr [100 x i32]* @H, i32 0, i32 %i               ; <i32*> [#uses=1]
+       %4 = load i32* %3, align 4              ; <i32> [#uses=1]
+       store i32 %4, i32* @G, align 4
+       br label %bb3
+
+bb1:           ; preds = %entry
+       %5 = tail call i32 (...)* @baz() nounwind               ; <i32> [#uses=0]
+       %6 = getelementptr [100 x i32]* @H, i32 0, i32 %i               ; <i32*> [#uses=1]
+       %7 = load i32* %6, align 4              ; <i32> [#uses=2]
+       store i32 %7, i32* @G, align 4
+       %8 = icmp eq i32 %7, 0          ; <i1> [#uses=1]
+       br i1 %8, label %bb3, label %bb4
+
+bb3:           ; preds = %bb1, %bb
+       %9 = getelementptr [100 x i32]* @H, i32 0, i32 %i               ; <i32*> [#uses=1]
+       %DEAD = load i32* %9, align 4           ; <i32> [#uses=1]
+       ret i32 %DEAD
+
+bb4:           ; preds = %bb1
+       ret i32 0
+}
+
+declare i32 @foo(...)
+
+declare i32 @bar(...)
+
+declare i32 @baz(...)