From 0b71d3972d9138c7482233bc44a9a207634769ef Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Wed, 5 Jan 2011 23:06:49 +0000
Subject: Optimize:   r1025 = s/zext r1024, 4   r1026 = extract_subreg r1025, 4
 to:   r1026 = copy r1024

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122925 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/CodeGen/X86/zext-extract_subreg.ll | 60 +++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 test/CodeGen/X86/zext-extract_subreg.ll

(limited to 'test/CodeGen/X86/zext-extract_subreg.ll')

diff --git a/test/CodeGen/X86/zext-extract_subreg.ll b/test/CodeGen/X86/zext-extract_subreg.ll
new file mode 100644
index 0000000000..e61e8805a2
--- /dev/null
+++ b/test/CodeGen/X86/zext-extract_subreg.ll
@@ -0,0 +1,60 @@
+; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s
+
+define void @t() nounwind ssp {
+; CHECK: t:
+entry:
+  br i1 undef, label %return, label %if.end.i
+
+if.end.i:                                         ; preds = %entry
+  %tmp7.i = load i32* undef, align 4, !tbaa !0
+  br i1 undef, label %return, label %if.end
+
+if.end:                                           ; preds = %if.end.i
+; CHECK: %if.end
+; CHECK: movl (%{{.*}}), [[REG:%[a-z]+]]
+; CHECK-NOT: movl [[REG]], [[REG]]
+; CHECK-NEXT: xorb
+  %tmp138 = select i1 undef, i32 0, i32 %tmp7.i
+  %tmp867 = zext i32 %tmp138 to i64
+  br label %while.cond
+
+while.cond:                                       ; preds = %while.body, %if.end
+  %tmp869 = sub i64 %tmp867, 0
+  %scale2.0 = trunc i64 %tmp869 to i32
+  %cmp149 = icmp eq i32 %scale2.0, 0
+  br i1 %cmp149, label %while.end, label %land.rhs
+
+land.rhs:                                         ; preds = %while.cond
+  br i1 undef, label %while.body, label %while.end
+
+while.body:                                       ; preds = %land.rhs
+  br label %while.cond
+
+while.end:                                        ; preds = %land.rhs, %while.cond
+  br i1 undef, label %cond.false205, label %cond.true190
+
+cond.true190:                                     ; preds = %while.end
+  br i1 undef, label %cond.false242, label %cond.true225
+
+cond.false205:                                    ; preds = %while.end
+  unreachable
+
+cond.true225:                                     ; preds = %cond.true190
+  br i1 undef, label %cond.false280, label %cond.true271
+
+cond.false242:                                    ; preds = %cond.true190
+  unreachable
+
+cond.true271:                                     ; preds = %cond.true225
+  unreachable
+
+cond.false280:                                    ; preds = %cond.true225
+  unreachable
+
+return:                                           ; preds = %if.end.i, %entry
+  ret void
+}
+
+!0 = metadata !{metadata !"int", metadata !1}
+!1 = metadata !{metadata !"omnipotent char", metadata !2}
+!2 = metadata !{metadata !"Simple C/C++ TBAA", null}
-- 
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