[SystemZ] Use CLST to implement strcmp

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188544 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 70 insertions, 0 deletions

diff --git a/test/CodeGen/SystemZ/strcmp-01.ll b/test/CodeGen/SystemZ/strcmp-01.ll
new file mode 100644
index 00000000000..122c160baba
--- /dev/null
+++ b/test/CodeGen/SystemZ/strcmp-01.ll
@@ -0,0 +1,70 @@
+; Test strcmp using CLST, i32 version.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+
+declare signext i32 @strcmp(i8 *%src1, i8 *%src2)
+
+; Check a case where the result is used as an integer.
+define i32 @f1(i8 *%src1, i8 *%src2) {
+; CHECK-LABEL: f1:
+; CHECK: lhi %r0, 0
+; CHECK: [[LABEL:\.[^:]*]]:
+; CHECK: clst %r2, %r3
+; CHECK-NEXT: jo [[LABEL]]
+; CHECK-NEXT: BB#{{[0-9]+}}
+; CHECK-NEXT: ipm [[REG:%r[0-5]]]
+; CHECK: srl [[REG]], 28
+; CHECK: rll %r2, [[REG]], 31
+; CHECK: br %r14
+  %res = call i32 @strcmp(i8 *%src1, i8 *%src2)
+  ret i32 %res
+}
+
+; Check a case where the result is tested for equality.
+define void @f2(i8 *%src1, i8 *%src2, i32 *%dest) {
+; CHECK-LABEL: f2:
+; CHECK: lhi %r0, 0
+; CHECK: [[LABEL:\.[^:]*]]:
+; CHECK: clst %r2, %r3
+; CHECK-NEXT: jo [[LABEL]]
+; CHECK-NEXT: BB#{{[0-9]+}}
+; CHECK-NEXT: je {{\.L.*}}
+; CHECK: br %r14
+  %res = call i32 @strcmp(i8 *%src1, i8 *%src2)
+  %cmp = icmp eq i32 %res, 0
+  br i1 %cmp, label %exit, label %store
+
+store:
+  store i32 0, i32 *%dest
+  br label %exit
+
+exit:
+  ret void
+}
+
+; Test a case where the result is used both as an integer and for
+; branching.
+define i32 @f3(i8 *%src1, i8 *%src2, i32 *%dest) {
+; CHECK-LABEL: f3:
+; CHECK: lhi %r0, 0
+; CHECK: [[LABEL:\.[^:]*]]:
+; CHECK: clst %r2, %r3
+; CHECK-NEXT: jo [[LABEL]]
+; CHECK-NEXT: BB#{{[0-9]+}}
+; CHECK-NEXT: ipm [[REG:%r[0-5]]]
+; CHECK: srl [[REG]], 28
+; CHECK: rll %r2, [[REG]], 31
+; CHECK: jl {{\.L*}}
+; CHECK: br %r14
+entry:
+  %res = call i32 @strcmp(i8 *%src1, i8 *%src2)
+  %cmp = icmp slt i32 %res, 0
+  br i1 %cmp, label %exit, label %store
+
+store:
+  store i32 0, i32 *%dest
+  br label %exit
+
+exit:
+  ret i32 %res
+}