From d131ff8cf81731c5088b401d0af51c8c7b9b6137 Mon Sep 17 00:00:00 2001
From: Richard Sandiford <rsandifo@linux.vnet.ibm.com>
Date: Mon, 8 Jul 2013 09:35:23 +0000
Subject: [SystemZ] Use MVC for memcpy

Use MVC for memcpy in cases where a single MVC is enough.  Using MVC is
a win for longer copies too, but I'll leave that for later.

llvm-svn: 185802
---
 llvm/test/CodeGen/SystemZ/memcpy-01.ll | 82 ++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 llvm/test/CodeGen/SystemZ/memcpy-01.ll

(limited to 'llvm/test')

diff --git a/llvm/test/CodeGen/SystemZ/memcpy-01.ll b/llvm/test/CodeGen/SystemZ/memcpy-01.ll
new file mode 100644
index 00000000000..2985b036d27
--- /dev/null
+++ b/llvm/test/CodeGen/SystemZ/memcpy-01.ll
@@ -0,0 +1,82 @@
+; Test memcpy using MVC.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+
+declare void @llvm.memcpy.p0i8.p0i8.i32(i8 *nocapture, i8 *nocapture, i32, i32, i1) nounwind
+declare void @llvm.memcpy.p0i8.p0i8.i64(i8 *nocapture, i8 *nocapture, i64, i32, i1) nounwind
+
+define void @f1(i8 *%dest, i8 *%src) {
+; CHECK: f1:
+; CHECK-NOT: %r2
+; CHECK-NOT: %r3
+; CHECK: br %r14
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8 *%dest, i8 *%src, i32 0, i32 1,
+                                       i1 false)
+  ret void
+}
+
+define void @f2(i8 *%dest, i8 *%src) {
+; CHECK: f2:
+; CHECK-NOT: %r2
+; CHECK-NOT: %r3
+; CHECK: br %r14
+  call void @llvm.memcpy.p0i8.p0i8.i64(i8 *%dest, i8 *%src, i64 0, i32 1,
+                                       i1 false)
+  ret void
+}
+
+define void @f3(i8 *%dest, i8 *%src) {
+; CHECK: f3:
+; CHECK: mvc 0(1,%r2), 0(%r3)
+; CHECK: br %r14
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8 *%dest, i8 *%src, i32 1, i32 1,
+                                       i1 false)
+  ret void
+}
+
+define void @f4(i8 *%dest, i8 *%src) {
+; CHECK: f4:
+; CHECK: mvc 0(1,%r2), 0(%r3)
+; CHECK: br %r14
+  call void @llvm.memcpy.p0i8.p0i8.i64(i8 *%dest, i8 *%src, i64 1, i32 1,
+                                       i1 false)
+  ret void
+}
+
+define void @f5(i8 *%dest, i8 *%src) {
+; CHECK: f5:
+; CHECK: mvc 0(256,%r2), 0(%r3)
+; CHECK: br %r14
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8 *%dest, i8 *%src, i32 256, i32 1,
+                                       i1 false)
+  ret void
+}
+
+define void @f6(i8 *%dest, i8 *%src) {
+; CHECK: f6:
+; CHECK: mvc 0(256,%r2), 0(%r3)
+; CHECK: br %r14
+  call void @llvm.memcpy.p0i8.p0i8.i64(i8 *%dest, i8 *%src, i64 256, i32 1,
+                                       i1 false)
+  ret void
+}
+
+; 257 bytes is too big for a single MVC.  For now expect none, so that
+; the test fails and gets updated when large copies are implemented.
+define void @f7(i8 *%dest, i8 *%src) {
+; CHECK: f7:
+; CHECK-NOT: mvc
+; CHECK: br %r14
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8 *%dest, i8 *%src, i32 257, i32 1,
+                                       i1 false)
+  ret void
+}
+
+define void @f8(i8 *%dest, i8 *%src) {
+; CHECK: f8:
+; CHECK-NOT: mvc
+; CHECK: br %r14
+  call void @llvm.memcpy.p0i8.p0i8.i64(i8 *%dest, i8 *%src, i64 257, i32 1,
+                                       i1 false)
+  ret void
+}
-- 
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