From ed70cbb3f367bc0f77d34d22163abbe4879526bc Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Wed, 26 Mar 2008 19:03:01 +0000
Subject: Avoid commuting a def MI in order to coalesce a copy instruction away
 if any use of the same val# is a copy instruction that has already been
 coalesced.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48833 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/CodeGen/X86/2007-03-26-CoalescerBug.ll | 49 +++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 test/CodeGen/X86/2007-03-26-CoalescerBug.ll

(limited to 'test/CodeGen/X86/2007-03-26-CoalescerBug.ll')

diff --git a/test/CodeGen/X86/2007-03-26-CoalescerBug.ll b/test/CodeGen/X86/2007-03-26-CoalescerBug.ll
new file mode 100644
index 0000000000..7ce0584c54
--- /dev/null
+++ b/test/CodeGen/X86/2007-03-26-CoalescerBug.ll
@@ -0,0 +1,49 @@
+; RUN: llvm-as < %s | llc -march=x86
+
+@data = external global [339 x i64]
+
+define void @foo(...) {
+bb1:
+	%t43 = load i64* getelementptr ([339 x i64]* @data, i32 0, i64 212), align 4
+	br i1 false, label %bb80, label %bb6
+bb6:
+	br i1 false, label %bb38, label %bb265
+bb265:
+	ret void
+bb38:
+	br i1 false, label %bb80, label %bb49
+bb80:
+	br i1 false, label %bb146, label %bb268
+bb49:
+	ret void
+bb113:
+	ret void
+bb268:
+	%t1062 = shl i64 %t43, 3
+	%t1066 = shl i64 0, 3
+	br label %bb85
+bb85:
+	%t1025 = phi i64 [ 0, %bb268 ], [ %t102.0, %bb234 ]
+	%t1028 = phi i64 [ 0, %bb268 ], [ %t1066, %bb234 ]
+	%t1031 = phi i64 [ 0, %bb268 ], [ %t103.0, %bb234 ]
+	%t1034 = phi i64 [ 0, %bb268 ], [ %t1066, %bb234 ]
+	%t102.0 = add i64 %t1028, %t1025
+	%t103.0 = add i64 %t1034, %t1031
+	br label %bb86
+bb86:
+	%t108.0 = phi i64 [ %t102.0, %bb85 ], [ %t1139, %bb248 ]
+	%t110.0 = phi i64 [ %t103.0, %bb85 ], [ %t1142, %bb248 ]
+	br label %bb193
+bb193:
+	%t1081 = add i64 %t110.0, -8
+	%t1087 = add i64 %t108.0, -8
+	br i1 false, label %bb193, label %bb248
+bb248:
+	%t1139 = add i64 %t108.0, %t1062
+	%t1142 = add i64 %t110.0, %t1062
+	br i1 false, label %bb86, label %bb234
+bb234:
+	br i1 false, label %bb85, label %bb113
+bb146:
+	ret void
+}
-- 
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