From 3231d13ddd9157fd66b06240e772774c8f616c8b Mon Sep 17 00:00:00 2001
From: Owen Anderson <resistor@mac.com>
Date: Wed, 22 Sep 2010 22:58:22 +0000
Subject: A select between a constant and zero, when fed by a bit test, can be
 efficiently lowered using a series of shifts. Fixes <rdar://problem/8285015>.

llvm-svn: 114599
---
 llvm/test/CodeGen/X86/bit-test-shift.ll | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 llvm/test/CodeGen/X86/bit-test-shift.ll

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

diff --git a/llvm/test/CodeGen/X86/bit-test-shift.ll b/llvm/test/CodeGen/X86/bit-test-shift.ll
new file mode 100644
index 00000000000..7497613f256
--- /dev/null
+++ b/llvm/test/CodeGen/X86/bit-test-shift.ll
@@ -0,0 +1,13 @@
+; RUN: llc < %s -march=x86 | FileCheck %s
+; <rdar://problem/8285015>
+
+define i32 @x(i32 %t) nounwind readnone ssp {
+entry:
+; CHECK: shll	$23, %eax
+; CHECK: sarl	$31, %eax
+; CHECK: andl	$-26, %eax
+  %and = and i32 %t, 256
+  %tobool = icmp eq i32 %and, 0
+  %retval.0 = select i1 %tobool, i32 0, i32 -26
+  ret i32 %retval.0
+}
-- 
cgit v1.2.3