Imported Upstream version 5.18.0.225

Former-commit-id: 10196d987d5fc5564b9d3b33b1fdf13190f4d0b5

external/llvm/test/CodeGen/ARM/iabs.ll

@@ -0,0 +1,34 @@
+; RUN: llc -mtriple=arm-eabi -mattr=+v4t %s -o - | FileCheck %s
+
+;; Integer absolute value, should produce something as good as: ARM:
+;;   movs r0, r0
+;;   rsbmi r0, r0, #0
+;;   bx lr
+
+define i32 @test(i32 %a) {
+        %tmp1neg = sub i32 0, %a
+        %b = icmp sgt i32 %a, -1
+        %abs = select i1 %b, i32 %a, i32 %tmp1neg
+        ret i32 %abs
+; CHECK:  cmp
+; CHECK:  rsbmi r0, r0, #0
+; CHECK:  bx lr
+}
+
+; rdar://11633193
+;; 3 instructions will be generated for abs(a-b):
+;;   subs
+;;   rsbmi
+;;   bx
+define i32 @test2(i32 %a, i32 %b) nounwind readnone ssp {
+entry:
+; CHECK: test2
+; CHECK: subs
+; CHECK-NEXT: rsbmi
+; CHECK-NEXT: bx
+  %sub = sub nsw i32 %a, %b
+  %cmp = icmp sgt i32 %sub, -1
+  %sub1 = sub nsw i32 0, %sub
+  %cond = select i1 %cmp, i32 %sub, i32 %sub1
+  ret i32 %cond
+}