[SystemZ] Use MVST to implement strcpy and stpcpy

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188546 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 50 insertions, 0 deletions

diff --git a/test/CodeGen/SystemZ/strcpy-01.ll b/test/CodeGen/SystemZ/strcpy-01.ll
new file mode 100644
index 0000000..29bab62
--- /dev/null
+++ b/test/CodeGen/SystemZ/strcpy-01.ll
@@ -0,0 +1,50 @@
+; Test strcpy using MVST.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+
+declare i8 *@strcpy(i8 *%dest, i8 *%src)
+declare i8 *@stpcpy(i8 *%dest, i8 *%src)
+
+; Check strcpy.
+define i8 *@f1(i8 *%dest, i8 *%src) {
+; CHECK-LABEL: f1:
+; CHECK-DAG: lhi %r0, 0
+; CHECK-DAG: lgr [[REG:%r[145]]], %r2
+; CHECK: [[LABEL:\.[^:]*]]:
+; CHECK-NEXT: mvst [[REG]], %r3
+; CHECK-NEXT: jo [[LABEL]]
+; CHECK-NOT: %r2
+; CHECK: br %r14
+  %res = call i8 *@strcpy(i8 *%dest, i8 *%src)
+  ret i8 *%res
+}
+
+; Check stpcpy.
+define i8 *@f2(i8 *%dest, i8 *%src) {
+; CHECK-LABEL: f2:
+; CHECK: lhi %r0, 0
+; CHECK: [[LABEL:\.[^:]*]]:
+; CHECK-NEXT: mvst %r2, %r3
+; CHECK-NEXT: jo [[LABEL]]
+; CHECK-NOT: %r2
+; CHECK: br %r14
+  %res = call i8 *@stpcpy(i8 *%dest, i8 *%src)
+  ret i8 *%res
+}
+
+; Check correct operation with other loads and stores.  The load must
+; come before the loop and the store afterwards.
+define i32 @f3(i32 %dummy, i8 *%dest, i8 *%src, i32 *%resptr, i32 *%storeptr) {
+; CHECK-LABEL: f3:
+; CHECK-DAG: lhi %r0, 0
+; CHECK-DAG: l %r2, 0(%r5)
+; CHECK: [[LABEL:\.[^:]*]]:
+; CHECK-NEXT: mvst %r3, %r4
+; CHECK-NEXT: jo [[LABEL]]
+; CHECK: mvhi 0(%r6), 0
+; CHECK: br %r14
+  %res = load i32 *%resptr
+  %unused = call i8 *@strcpy(i8 *%dest, i8 *%src)
+  store i32 0, i32 *%storeptr
+  ret i32 %res
+}