From e65cd40ab99c3bd43dc997873e500643d012bbad Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Mon, 5 Oct 2009 05:26:04 +0000
Subject: teach the optimizer how to constant fold uadd/usub intrinsics.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83295 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/Transforms/ConstProp/overflow-ops.ll | 53 +++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 test/Transforms/ConstProp/overflow-ops.ll

(limited to 'test/Transforms/ConstProp/overflow-ops.ll')

diff --git a/test/Transforms/ConstProp/overflow-ops.ll b/test/Transforms/ConstProp/overflow-ops.ll
new file mode 100644
index 0000000..52d5921
--- /dev/null
+++ b/test/Transforms/ConstProp/overflow-ops.ll
@@ -0,0 +1,53 @@
+; RUN: opt < %s -constprop -S | FileCheck %s
+
+%i8i1 = type {i8, i1}
+
+;;-----------------------------
+;; uadd
+;;-----------------------------
+
+define {i8, i1} @uadd_1() nounwind {
+entry:
+  %t = call {i8, i1} @llvm.uadd.with.overflow.i8(i8 42, i8 100)
+  ret {i8, i1} %t
+
+; CHECK: @uadd_1
+; CHECK: ret %i8i1 { i8 -114, i1 false }
+}
+
+define {i8, i1} @uadd_2() nounwind {
+entry:
+  %t = call {i8, i1} @llvm.uadd.with.overflow.i8(i8 142, i8 120)
+  ret {i8, i1} %t
+
+; CHECK: @uadd_2
+; CHECK: ret %i8i1 { i8 6, i1 true }
+}
+
+
+;;-----------------------------
+;; usub
+;;-----------------------------
+
+define {i8, i1} @usub_1() nounwind {
+entry:
+  %t = call {i8, i1} @llvm.usub.with.overflow.i8(i8 4, i8 2)
+  ret {i8, i1} %t
+
+; CHECK: @usub_1
+; CHECK: ret %i8i1 { i8 2, i1 false }
+}
+
+define {i8, i1} @usub_2() nounwind {
+entry:
+  %t = call {i8, i1} @llvm.usub.with.overflow.i8(i8 4, i8 6)
+  ret {i8, i1} %t
+
+; CHECK: @usub_2
+; CHECK: ret %i8i1 { i8 -2, i1 true }
+}
+
+
+
+declare {i8, i1} @llvm.uadd.with.overflow.i8(i8, i8)
+declare {i8, i1} @llvm.usub.with.overflow.i8(i8, i8)
-- 
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