[InstCombine] add tests for not+sub; NFC

llvm-svn: 338117

Author: rotateright

llvm/test/Transforms/InstCombine/sub-not.ll

@@ -0,0 +1,110 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+declare void @use(i8)
+
+define i8 @sub_not(i8 %x, i8 %y) {
+; CHECK-LABEL: @sub_not(
+; CHECK-NEXT:    [[S:%.*]] = sub i8 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[R:%.*]] = xor i8 [[S]], -1
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %s = sub i8 %x, %y
+  %r = xor i8 %s, -1
+  ret i8 %r
+}
+
+define i8 @sub_not_extra_use(i8 %x, i8 %y) {
+; CHECK-LABEL: @sub_not_extra_use(
+; CHECK-NEXT:    [[S:%.*]] = sub i8 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[R:%.*]] = xor i8 [[S]], -1
+; CHECK-NEXT:    call void @use(i8 [[S]])
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %s = sub i8 %x, %y
+  %r = xor i8 %s, -1
+  call void @use(i8 %s)
+  ret i8 %r
+}
+
+define <2 x i8> @sub_not_vec(<2 x i8> %x, <2 x i8> %y) {
+; CHECK-LABEL: @sub_not_vec(
+; CHECK-NEXT:    [[S:%.*]] = sub <2 x i8> [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[R:%.*]] = xor <2 x i8> [[S]], <i8 -1, i8 undef>
+; CHECK-NEXT:    ret <2 x i8> [[R]]
+;
+  %s = sub <2 x i8> %x, %y
+  %r = xor <2 x i8> %s, <i8 -1, i8 undef>
+  ret <2 x i8> %r
+}
+
+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:    ret i8 [[R]]
+;
+  %s = sub i8 %x, %y
+  %r = add i8 %s, -1
+  ret i8 %r
+}
+
+define i8 @dec_sub_extra_use(i8 %x, i8 %y) {
+; CHECK-LABEL: @dec_sub_extra_use(
+; CHECK-NEXT:    [[S:%.*]] = sub i8 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[R:%.*]] = add i8 [[S]], -1
+; CHECK-NEXT:    call void @use(i8 [[S]])
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %s = sub i8 %x, %y
+  %r = add i8 %s, -1
+  call void @use(i8 %s)
+  ret i8 %r
+}
+
+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:    ret <2 x i8> [[R]]
+;
+  %s = sub <2 x i8> %x, %y
+  %r = add <2 x i8> %s, <i8 -1, i8 undef>
+  ret <2 x i8> %r
+}
+
+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:    ret i8 [[R]]
+;
+  %s = add i8 %x, 1
+  %r = sub i8 %y, %s
+  ret i8 %r
+}
+
+define i8 @sub_inc_extra_use(i8 %x, i8 %y) {
+; CHECK-LABEL: @sub_inc_extra_use(
+; CHECK-NEXT:    [[S:%.*]] = add i8 [[X:%.*]], 1
+; CHECK-NEXT:    [[R:%.*]] = sub i8 [[Y:%.*]], [[S]]
+; CHECK-NEXT:    call void @use(i8 [[S]])
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %s = add i8 %x, 1
+  %r = sub i8 %y, %s
+  call void @use(i8 %s)
+  ret i8 %r
+}
+
+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:    ret <2 x i8> [[R]]
+;
+  %s = add <2 x i8> %x, <i8 undef, i8 1>
+  %r = sub <2 x i8> %y, %s
+  ret <2 x i8> %r
+}
+