1 files changed, 43 insertions, 8 deletions
diff --git a/test/Transforms/InstCombine/sub-not.ll b/test/Transforms/InstCombine/sub-not.ll
index 5fc42367dad4..cd1f8f3bd52d 100644
--- a/test/Transforms/InstCombine/sub-not.ll
+++ b/test/Transforms/InstCombine/sub-not.ll
@@ -40,8 +40,8 @@ define <2 x i8> @sub_not_vec(<2 x i8> %x, <2 x i8> %y) {
 
 define i8 @dec_sub(i8 %x, i8 %y) {
 ; CHECK-LABEL: @dec_sub(
-; CHECK-NEXT:    [[S:%.*]] = sub i8 [[X:%.*]], [[Y:%.*]]
-; CHECK-NEXT:    [[R:%.*]] = add i8 [[S]], -1
+; CHECK-NEXT:    [[TMP1:%.*]] = xor i8 [[Y:%.*]], -1
+; CHECK-NEXT:    [[R:%.*]] = add i8 [[TMP1]], [[X:%.*]]
 ; CHECK-NEXT:    ret i8 [[R]]
 ;
   %s = sub i8 %x, %y
@@ -64,8 +64,8 @@ define i8 @dec_sub_extra_use(i8 %x, i8 %y) {
 
 define <2 x i8> @dec_sub_vec(<2 x i8> %x, <2 x i8> %y) {
 ; CHECK-LABEL: @dec_sub_vec(
-; CHECK-NEXT:    [[S:%.*]] = sub <2 x i8> [[X:%.*]], [[Y:%.*]]
-; CHECK-NEXT:    [[R:%.*]] = add <2 x i8> [[S]], <i8 -1, i8 undef>
+; CHECK-NEXT:    [[TMP1:%.*]] = xor <2 x i8> [[Y:%.*]], <i8 -1, i8 -1>
+; CHECK-NEXT:    [[R:%.*]] = add <2 x i8> [[TMP1]], [[X:%.*]]
 ; CHECK-NEXT:    ret <2 x i8> [[R]]
 ;
   %s = sub <2 x i8> %x, %y
@@ -75,8 +75,8 @@ define <2 x i8> @dec_sub_vec(<2 x i8> %x, <2 x i8> %y) {
 
 define i8 @sub_inc(i8 %x, i8 %y) {
 ; CHECK-LABEL: @sub_inc(
-; CHECK-NEXT:    [[S:%.*]] = add i8 [[X:%.*]], 1
-; CHECK-NEXT:    [[R:%.*]] = sub i8 [[Y:%.*]], [[S]]
+; CHECK-NEXT:    [[TMP1:%.*]] = xor i8 [[X:%.*]], -1
+; CHECK-NEXT:    [[R:%.*]] = add i8 [[TMP1]], [[Y:%.*]]
 ; CHECK-NEXT:    ret i8 [[R]]
 ;
   %s = add i8 %x, 1
@@ -99,8 +99,8 @@ define i8 @sub_inc_extra_use(i8 %x, i8 %y) {
 
 define <2 x i8> @sub_inc_vec(<2 x i8> %x, <2 x i8> %y) {
 ; CHECK-LABEL: @sub_inc_vec(
-; CHECK-NEXT:    [[S:%.*]] = add <2 x i8> [[X:%.*]], <i8 undef, i8 1>
-; CHECK-NEXT:    [[R:%.*]] = sub <2 x i8> [[Y:%.*]], [[S]]
+; CHECK-NEXT:    [[TMP1:%.*]] = xor <2 x i8> [[X:%.*]], <i8 -1, i8 -1>
+; CHECK-NEXT:    [[R:%.*]] = add <2 x i8> [[TMP1]], [[Y:%.*]]
 ; CHECK-NEXT:    ret <2 x i8> [[R]]
 ;
   %s = add <2 x i8> %x, <i8 undef, i8 1>
@@ -108,3 +108,38 @@ define <2 x i8> @sub_inc_vec(<2 x i8> %x, <2 x i8> %y) {
   ret <2 x i8> %r
 }
 
+define i8 @sub_dec(i8 %x, i8 %y) {
+; CHECK-LABEL: @sub_dec(
+; CHECK-NEXT:    [[TMP1:%.*]] = xor i8 [[Y:%.*]], -1
+; CHECK-NEXT:    [[R:%.*]] = add i8 [[TMP1]], [[X:%.*]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %s = add i8 %x, -1
+  %r = sub i8 %s, %y
+  ret i8 %r
+}
+
+define i8 @sub_dec_extra_use(i8 %x, i8 %y) {
+; CHECK-LABEL: @sub_dec_extra_use(
+; CHECK-NEXT:    [[S:%.*]] = add i8 [[X:%.*]], -1
+; CHECK-NEXT:    [[R:%.*]] = sub i8 [[S]], [[Y:%.*]]
+; CHECK-NEXT:    call void @use(i8 [[S]])
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %s = add i8 %x, -1
+  %r = sub i8 %s, %y
+  call void @use(i8 %s)
+  ret i8 %r
+}
+
+define <2 x i8> @sub_dec_vec(<2 x i8> %x, <2 x i8> %y) {
+; CHECK-LABEL: @sub_dec_vec(
+; CHECK-NEXT:    [[TMP1:%.*]] = xor <2 x i8> [[Y:%.*]], <i8 -1, i8 -1>
+; CHECK-NEXT:    [[R:%.*]] = add <2 x i8> [[TMP1]], [[X:%.*]]
+; CHECK-NEXT:    ret <2 x i8> [[R]]
+;
+  %s = add <2 x i8> %x, <i8 undef, i8 -1>
+  %r = sub <2 x i8> %s, %y
+  ret <2 x i8> %r
+}
+