From 1877ac993757e7e7290b9b1e9f3a0f11dd2f5c28 Mon Sep 17 00:00:00 2001
From: Eli Friedman <eli.friedman@gmail.com>
Date: Thu, 9 Jun 2011 22:14:44 +0000
Subject: Change this DAGCombine to build AND of SHR instead of SHR of AND;
 this matches the ordering we prefer in instcombine.  Part of rdar://9562809.

The potential DAGCombine which enforces this more generally messes up some other very fragile patterns, so I'm leaving that alone, at least for now.

llvm-svn: 132809
---
 llvm/test/CodeGen/X86/shift-pair.ll | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 llvm/test/CodeGen/X86/shift-pair.ll

(limited to 'llvm/test/CodeGen/X86/shift-pair.ll')

diff --git a/llvm/test/CodeGen/X86/shift-pair.ll b/llvm/test/CodeGen/X86/shift-pair.ll
new file mode 100644
index 00000000000..24ba1fc7707
--- /dev/null
+++ b/llvm/test/CodeGen/X86/shift-pair.ll
@@ -0,0 +1,11 @@
+; RUN: llc < %s -march=x86-64 | FileCheck %s
+
+define i64 @test(i64 %A) {
+; CHECK: @test
+; CHECK: shrq $54
+; CHECK: andq $1020
+; CHECK: ret
+    %B = lshr i64 %A, 56
+    %C = shl i64 %B, 2
+    ret i64 %C
+}
-- 
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