From df298c9ea64eb335f63fc075d8ef6306682ffe75 Mon Sep 17 00:00:00 2001
From: Owen Anderson <resistor@mac.com>
Date: Wed, 6 Apr 2011 23:35:59 +0000
Subject: Teach the ARM peephole optimizer that RSB, RSC, ADC, and SBC can be
 used for folded comparisons, just like ADD and SUB.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129038 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/CodeGen/ARM/sub.ll | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'test/CodeGen/ARM/sub.ll')

diff --git a/test/CodeGen/ARM/sub.ll b/test/CodeGen/ARM/sub.ll
index 7ada14d..555b18e 100644
--- a/test/CodeGen/ARM/sub.ll
+++ b/test/CodeGen/ARM/sub.ll
@@ -27,3 +27,12 @@ define i64 @f3(i64 %a) {
    ret i64 %tmp
 }
 
+define i32 @f4(i32 %x) {
+entry:
+; CHECK: f4
+; CHECK: rsbs
+  %sub = sub i32 1, %x
+  %cmp = icmp ugt i32 %sub, 0
+  %sel = select i1 %cmp, i32 1, i32 %sub
+  ret i32 %sel
+}
-- 
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