[SelectionDAG] Don't treat library calls specially if marked with nobuiltin.
To be used by D19781.
Differential Revision: http://reviews.llvm.org/D19801
llvm-svn: 273039
diff --git a/llvm/test/CodeGen/SystemZ/strcmp-nobuiltin.ll b/llvm/test/CodeGen/SystemZ/strcmp-nobuiltin.ll
new file mode 100644
index 0000000..1873488
--- /dev/null
+++ b/llvm/test/CodeGen/SystemZ/strcmp-nobuiltin.ll
@@ -0,0 +1,54 @@
+; Test that strcmp won't be converted to CLST if calls are
+; marked with nobuiltin, eg. for sanitizers.
+;
+; 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-NOT: clst
+; CHECK: brasl %r14, strcmp
+; CHECK: br %r14
+ %res = call i32 @strcmp(i8 *%src1, i8 *%src2) nobuiltin
+ 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-NOT: clst
+; CHECK: brasl %r14, strcmp
+; CHECK: br %r14
+ %res = call i32 @strcmp(i8 *%src1, i8 *%src2) nobuiltin
+ %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-NOT: clst
+; CHECK: brasl %r14, strcmp
+; CHECK: br %r14
+entry:
+ %res = call i32 @strcmp(i8 *%src1, i8 *%src2) nobuiltin
+ %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
+}