[llvm] r365999 - [InstCombine] add tests for umin/umax via usub.sat; NFC

[Sanjay Patel via llvm-commits]

Author: spatel
Date: Sat Jul 13 05:54:48 2019
New Revision: 365999

URL: http://llvm.org/viewvc/llvm-project?rev=365999&view=rev
Log:
[InstCombine] add tests for umin/umax via usub.sat; NFC

Modified:
    llvm/trunk/test/Transforms/InstCombine/saturating-add-sub.ll

Modified: llvm/trunk/test/Transforms/InstCombine/saturating-add-sub.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/saturating-add-sub.ll?rev=365999&r1=365998&r2=365999&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/saturating-add-sub.ll (original)
+++ llvm/trunk/test/Transforms/InstCombine/saturating-add-sub.ll Sat Jul 13 05:54:48 2019
@@ -1614,3 +1614,75 @@ define i32 @unsigned_sat_constant_using_
   %r = add i32 %s, -42
   ret i32 %r
 }
+
+define i8 @umax(i8 %a, i8 %b) {
+; CHECK-LABEL: @umax(
+; CHECK-NEXT:    [[USUB:%.*]] = tail call i8 @llvm.usub.sat.i8(i8 [[A:%.*]], i8 [[B:%.*]])
+; CHECK-NEXT:    [[R:%.*]] = add i8 [[USUB]], [[B]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %usub = tail call i8 @llvm.usub.sat.i8(i8 %a, i8 %b)
+  %r = add i8 %usub, %b
+  ret i8 %r
+}
+
+define <2 x i8> @umax_vec(<2 x i8> %a, <2 x i8> %b) {
+; CHECK-LABEL: @umax_vec(
+; CHECK-NEXT:    [[USUB:%.*]] = tail call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> [[B:%.*]])
+; CHECK-NEXT:    [[R:%.*]] = add <2 x i8> [[USUB]], [[B]]
+; CHECK-NEXT:    ret <2 x i8> [[R]]
+;
+  %usub = tail call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> %a, <2 x i8> %b)
+  %r = add <2 x i8> %usub, %b
+  ret <2 x i8> %r
+}
+
+define i8 @umax_extra_use(i8 %a, i8 %b) {
+; CHECK-LABEL: @umax_extra_use(
+; CHECK-NEXT:    [[USUB:%.*]] = tail call i8 @llvm.usub.sat.i8(i8 [[A:%.*]], i8 [[B:%.*]])
+; CHECK-NEXT:    call void @use(i8 [[USUB]])
+; CHECK-NEXT:    [[R:%.*]] = add i8 [[USUB]], [[B]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %usub = tail call i8 @llvm.usub.sat.i8(i8 %a, i8 %b)
+  call void @use(i8 %usub)
+  %r = add i8 %usub, %b
+  ret i8 %r
+}
+
+define i8 @umin(i8 %a, i8 %b) {
+; CHECK-LABEL: @umin(
+; CHECK-NEXT:    [[USUB:%.*]] = tail call i8 @llvm.usub.sat.i8(i8 [[A:%.*]], i8 [[B:%.*]])
+; CHECK-NEXT:    [[R:%.*]] = sub i8 [[A]], [[USUB]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %usub = tail call i8 @llvm.usub.sat.i8(i8 %a, i8 %b)
+  %r = sub i8 %a, %usub
+  ret i8 %r
+}
+
+define <2 x i8> @umin_vec(<2 x i8> %a, <2 x i8> %b) {
+; CHECK-LABEL: @umin_vec(
+; CHECK-NEXT:    [[USUB:%.*]] = tail call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> [[B:%.*]])
+; CHECK-NEXT:    [[R:%.*]] = sub <2 x i8> [[A]], [[USUB]]
+; CHECK-NEXT:    ret <2 x i8> [[R]]
+;
+  %usub = tail call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> %a, <2 x i8> %b)
+  %r = sub <2 x i8> %a, %usub
+  ret <2 x i8> %r
+}
+
+define i8 @umin_extra_use(i8 %a, i8 %b) {
+; CHECK-LABEL: @umin_extra_use(
+; CHECK-NEXT:    [[USUB:%.*]] = tail call i8 @llvm.usub.sat.i8(i8 [[A:%.*]], i8 [[B:%.*]])
+; CHECK-NEXT:    call void @use(i8 [[USUB]])
+; CHECK-NEXT:    [[R:%.*]] = sub i8 [[A]], [[USUB]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %usub = tail call i8 @llvm.usub.sat.i8(i8 %a, i8 %b)
+  call void @use(i8 %usub)
+  %r = sub i8 %a, %usub
+  ret i8 %r
+}
+
+declare void @use(i8)