From a0885fb8825ed362041b5cf291a007a9f9301ff8 Mon Sep 17 00:00:00 2001
From: Meador Inge <meadori@codesourcery.com>
Date: Wed, 31 Oct 2012 03:33:00 +0000
Subject: instcombine: Migrate strncpy optimizations

This patch migrates the strncpy optimizations from the simplify-libcalls
pass into the instcombine library call simplifier.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167102 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/Transforms/InstCombine/strncpy-2.ll | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 test/Transforms/InstCombine/strncpy-2.ll

(limited to 'test/Transforms/InstCombine/strncpy-2.ll')

diff --git a/test/Transforms/InstCombine/strncpy-2.ll b/test/Transforms/InstCombine/strncpy-2.ll
new file mode 100644
index 0000000000..ac28ea6550
--- /dev/null
+++ b/test/Transforms/InstCombine/strncpy-2.ll
@@ -0,0 +1,22 @@
+; Test that the strncpy library call simplifier works correctly.
+;
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
+
+@hello = constant [6 x i8] c"hello\00"
+@a = common global [32 x i8] zeroinitializer, align 1
+
+declare i16* @strncpy(i8*, i8*, i32)
+
+; Check that 'strncpy' functions with the wrong prototype aren't simplified.
+
+define void @test_no_simplify1() {
+; CHECK: @test_no_simplify1
+  %dst = getelementptr [32 x i8]* @a, i32 0, i32 0
+  %src = getelementptr [6 x i8]* @hello, i32 0, i32 0
+
+  call i16* @strncpy(i8* %dst, i8* %src, i32 6)
+; CHECK: call i16* @strncpy
+  ret void
+}
-- 
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