1 files changed, 65 insertions, 0 deletions
diff --git a/test/CodeGen/ARM/sub-cmp-peephole.ll b/test/CodeGen/ARM/sub-cmp-peephole.ll
new file mode 100644
index 0000000..6fcbdee
--- /dev/null
+++ b/test/CodeGen/ARM/sub-cmp-peephole.ll
@@ -0,0 +1,65 @@
+; RUN: llc < %s -mtriple=arm-apple-darwin | FileCheck %s
+
+define i32 @f(i32 %a, i32 %b) nounwind ssp {
+entry:
+; CHECK: f:
+; CHECK: subs
+; CHECK-NOT: cmp
+  %cmp = icmp sgt i32 %a, %b
+  %sub = sub nsw i32 %a, %b
+  %sub. = select i1 %cmp, i32 %sub, i32 0
+  ret i32 %sub.
+}
+
+define i32 @g(i32 %a, i32 %b) nounwind ssp {
+entry:
+; CHECK: g:
+; CHECK: subs
+; CHECK-NOT: cmp
+  %cmp = icmp slt i32 %a, %b
+  %sub = sub nsw i32 %b, %a
+  %sub. = select i1 %cmp, i32 %sub, i32 0
+  ret i32 %sub.
+}
+
+define i32 @h(i32 %a, i32 %b) nounwind ssp {
+entry:
+; CHECK: h:
+; CHECK: subs
+; CHECK-NOT: cmp
+  %cmp = icmp sgt i32 %a, 3
+  %sub = sub nsw i32 %a, 3
+  %sub. = select i1 %cmp, i32 %sub, i32 %b
+  ret i32 %sub.
+}
+
+; rdar://11725965
+define i32 @i(i32 %a, i32 %b) nounwind readnone ssp {
+entry:
+; CHECK: i:
+; CHECK: subs
+; CHECK-NOT: cmp
+  %cmp = icmp ult i32 %a, %b
+  %sub = sub i32 %b, %a
+  %sub. = select i1 %cmp, i32 %sub, i32 0
+  ret i32 %sub.
+}
+; If CPSR is live-out, we can't remove cmp if there exists
+; a swapped sub.
+define i32 @j(i32 %a, i32 %b) nounwind {
+entry:
+; CHECK: j:
+; CHECK: sub
+; CHECK: cmp
+  %cmp = icmp eq i32 %b, %a
+  %sub = sub nsw i32 %a, %b
+  br i1 %cmp, label %if.then, label %if.else
+
+if.then:
+  %cmp2 = icmp sgt i32 %b, %a
+  %sel = select i1 %cmp2, i32 %sub, i32 %a
+  ret i32 %sel
+
+if.else:
+  ret i32 %sub
+}