From 3d01334e6fa5caba1361d088fabf728c64b23c58 Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Wed, 19 Aug 2009 22:46:59 +0000
Subject: Fix a bug in the over-index constant folding. When over-indexing an
 array member of a struct, it's possible to land in an arbitrary position
 inside that struct, such that attempting to find further getelementptr
 indices will fail. In such cases, folding cannot be done.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79485 91177308-0d34-0410-b5e6-96231b3b80d8
---
 .../InstCombine/constant-fold-gep-overindex.ll          | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 test/Transforms/InstCombine/constant-fold-gep-overindex.ll

(limited to 'test')

diff --git a/test/Transforms/InstCombine/constant-fold-gep-overindex.ll b/test/Transforms/InstCombine/constant-fold-gep-overindex.ll
new file mode 100644
index 0000000000..15bdab49ee
--- /dev/null
+++ b/test/Transforms/InstCombine/constant-fold-gep-overindex.ll
@@ -0,0 +1,17 @@
+; RUN: llvm-as < %s | opt -instcombine
+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-darwin10.0"
+
+%0 = type { i8*, [19 x i8] }
+%1 = type { i8*, [0 x i8] }
+
+@s = external global %0                           ; <%0*> [#uses=1]
+@"\01LC8" = external constant [17 x i8]           ; <[17 x i8]*> [#uses=1]
+
+define i32 @main() nounwind {
+entry:
+  %0 = call i32 (i8*, ...)* @printf(i8* getelementptr ([17 x i8]* @"\01LC8", i32 0, i32 0), i8* undef, i8* getelementptr (%1* bitcast (%0* @s to %1*), i32 0, i32 1, i32 0)) nounwind ; <i32> [#uses=0]
+  ret i32 0
+}
+
+declare i32 @printf(i8*, ...) nounwind
-- 
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