From cee291c505fb119c15f111225f62a8275548bb6c Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Mon, 29 Oct 2007 05:47:52 +0000
Subject: Model stacksave and stackrestore as both writing memory, since we
 don't model their dependences on allocas correctly.  This fixes PR1745.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43442 91177308-0d34-0410-b5e6-96231b3b80d8
---
 .../Transforms/InstCombine/2007-10-28-stacksave.ll | 47 ++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 test/Transforms/InstCombine/2007-10-28-stacksave.ll

(limited to 'test/Transforms/InstCombine/2007-10-28-stacksave.ll')

diff --git a/test/Transforms/InstCombine/2007-10-28-stacksave.ll b/test/Transforms/InstCombine/2007-10-28-stacksave.ll
new file mode 100644
index 0000000000..5f884d4a78
--- /dev/null
+++ b/test/Transforms/InstCombine/2007-10-28-stacksave.ll
@@ -0,0 +1,47 @@
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {call.*stacksave}
+; PR1745
+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 = "i686-apple-darwin8"
+@p = weak global i8* null		; <i8**> [#uses=1]
+
+define i32 @main() {
+entry:
+	%"alloca point" = bitcast i32 0 to i32		; <i32> [#uses=0]
+	br label %lab
+
+lab:		; preds = %cleanup31, %entry
+	%n.0 = phi i32 [ 0, %entry ], [ %tmp25, %cleanup31 ]		; <i32> [#uses=2]
+	%tmp2 = call i8* @llvm.stacksave( )		; <i8*> [#uses=2]
+	%tmp4 = srem i32 %n.0, 47		; <i32> [#uses=1]
+	%tmp5 = add i32 %tmp4, 1		; <i32> [#uses=5]
+	%tmp7 = sub i32 %tmp5, 1		; <i32> [#uses=0]
+	%tmp89 = zext i32 %tmp5 to i64		; <i64> [#uses=1]
+	%tmp10 = mul i64 %tmp89, 32		; <i64> [#uses=0]
+	%tmp12 = mul i32 %tmp5, 4		; <i32> [#uses=0]
+	%tmp1314 = zext i32 %tmp5 to i64		; <i64> [#uses=1]
+	%tmp15 = mul i64 %tmp1314, 32		; <i64> [#uses=0]
+	%tmp17 = mul i32 %tmp5, 4		; <i32> [#uses=1]
+	%tmp18 = alloca i8, i32 %tmp17		; <i8*> [#uses=1]
+	%tmp1819 = bitcast i8* %tmp18 to i32*		; <i32*> [#uses=2]
+	%tmp21 = getelementptr i32* %tmp1819, i32 0		; <i32*> [#uses=1]
+	store i32 1, i32* %tmp21, align 4
+	%tmp2223 = bitcast i32* %tmp1819 to i8*		; <i8*> [#uses=1]
+	volatile store i8* %tmp2223, i8** @p, align 4
+	%tmp25 = add i32 %n.0, 1		; <i32> [#uses=2]
+	%tmp27 = icmp sle i32 %tmp25, 999999		; <i1> [#uses=1]
+	%tmp2728 = zext i1 %tmp27 to i8		; <i8> [#uses=1]
+	%toBool = icmp ne i8 %tmp2728, 0		; <i1> [#uses=1]
+	br i1 %toBool, label %cleanup31, label %cond_next
+
+cond_next:		; preds = %lab
+	call void @llvm.stackrestore( i8* %tmp2 )
+	ret i32 0
+
+cleanup31:		; preds = %lab
+	call void @llvm.stackrestore( i8* %tmp2 )
+	br label %lab
+}
+
+declare i8* @llvm.stacksave()
+
+declare void @llvm.stackrestore(i8*)
-- 
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