[InstCombine] add tests for add-xor; NFC

Author: rotateright

llvm/test/Transforms/InstCombine/sub-xor.ll

@@ -1,9 +1,11 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt -instcombine -S < %s | FileCheck %s
 
+declare void @use(i32)
+
 define i32 @test1(i32 %x) {
 ; CHECK-LABEL: @test1(
-; CHECK-NEXT:    [[AND:%.*]] = and i32 %x, 31
+; CHECK-NEXT:    [[AND:%.*]] = and i32 [[X:%.*]], 31
 ; CHECK-NEXT:    [[SUB:%.*]] = xor i32 [[AND]], 63
 ; CHECK-NEXT:    ret i32 [[SUB]]
 ;
@@ -14,7 +16,7 @@ define i32 @test1(i32 %x) {
 
 define <2 x i32> @test1vec(<2 x i32> %x) {
 ; CHECK-LABEL: @test1vec(
-; CHECK-NEXT:    [[AND:%.*]] = and <2 x i32> %x, <i32 31, i32 31>
+; CHECK-NEXT:    [[AND:%.*]] = and <2 x i32> [[X:%.*]], <i32 31, i32 31>
 ; CHECK-NEXT:    [[SUB:%.*]] = xor <2 x i32> [[AND]], <i32 63, i32 63>
 ; CHECK-NEXT:    ret <2 x i32> [[SUB]]
 ;
@@ -27,7 +29,7 @@ declare i32 @llvm.ctlz.i32(i32, i1) nounwind readnone
 
 define i32 @test2(i32 %x) nounwind {
 ; CHECK-LABEL: @test2(
-; CHECK-NEXT:    [[COUNT:%.*]] = tail call i32 @llvm.ctlz.i32(i32 %x, i1 true)
+; CHECK-NEXT:    [[COUNT:%.*]] = tail call i32 @llvm.ctlz.i32(i32 [[X:%.*]], i1 true) [[ATTR2:#.*]], [[RNG0:!range !.*]]
 ; CHECK-NEXT:    [[SUB:%.*]] = xor i32 [[COUNT]], 31
 ; CHECK-NEXT:    ret i32 [[SUB]]
 ;
@@ -36,15 +38,55 @@ define i32 @test2(i32 %x) nounwind {
   ret i32 %sub
 }
 
-define i32 @test3(i32 %x) {
-; CHECK-LABEL: @test3(
-; CHECK-NEXT:    [[AND:%.*]] = and i32 %x, 31
+define i32 @xor_add(i32 %x) {
+; CHECK-LABEL: @xor_add(
+; CHECK-NEXT:    [[AND:%.*]] = and i32 [[X:%.*]], 31
 ; CHECK-NEXT:    [[ADD:%.*]] = sub nuw nsw i32 73, [[AND]]
 ; CHECK-NEXT:    ret i32 [[ADD]]
 ;
   %and = and i32 %x, 31
-  %sub = xor i32 31, %and
-  %add = add i32 %sub, 42
+  %xor = xor i32 %and, 31
+  %add = add i32 %xor, 42
+  ret i32 %add
+}
+
+define i32 @xor_add_extra_use(i32 %x) {
+; CHECK-LABEL: @xor_add_extra_use(
+; CHECK-NEXT:    [[AND:%.*]] = and i32 [[X:%.*]], 31
+; CHECK-NEXT:    [[XOR:%.*]] = xor i32 [[AND]], 31
+; CHECK-NEXT:    call void @use(i32 [[XOR]])
+; CHECK-NEXT:    [[ADD:%.*]] = add nuw nsw i32 [[XOR]], 42
+; CHECK-NEXT:    ret i32 [[ADD]]
+;
+  %and = and i32 %x, 31
+  %xor = xor i32 %and, 31
+  call void @use(i32 %xor)
+  %add = add i32 %xor, 42
   ret i32 %add
 }
 
+define <2 x i8> @xor_add_splat(<2 x i8> %x) {
+; CHECK-LABEL: @xor_add_splat(
+; CHECK-NEXT:    [[AND:%.*]] = and <2 x i8> [[X:%.*]], <i8 24, i8 24>
+; CHECK-NEXT:    [[XOR:%.*]] = xor <2 x i8> [[AND]], <i8 63, i8 63>
+; CHECK-NEXT:    [[ADD:%.*]] = add nuw nsw <2 x i8> [[XOR]], <i8 42, i8 42>
+; CHECK-NEXT:    ret <2 x i8> [[ADD]]
+;
+  %and = and <2 x i8> %x, <i8 24, i8 24>
+  %xor = xor <2 x i8> %and, <i8 63, i8 63>
+  %add = add <2 x i8> %xor, <i8 42, i8 42>
+  ret <2 x i8> %add
+}
+
+define <2 x i8> @xor_add_splat_undef(<2 x i8> %x) {
+; CHECK-LABEL: @xor_add_splat_undef(
+; CHECK-NEXT:    [[AND:%.*]] = and <2 x i8> [[X:%.*]], <i8 24, i8 24>
+; CHECK-NEXT:    [[XOR:%.*]] = xor <2 x i8> [[AND]], <i8 63, i8 undef>
+; CHECK-NEXT:    [[ADD:%.*]] = add <2 x i8> [[XOR]], <i8 42, i8 42>
+; CHECK-NEXT:    ret <2 x i8> [[ADD]]
+;
+  %and = and <2 x i8> %x, <i8 24, i8 24>
+  %xor = xor <2 x i8> %and, <i8 63, i8 undef>
+  %add = add <2 x i8> %xor, <i8 42, i8 42>
+  ret <2 x i8> %add
+}