[llvm] r370878 - [NFC] Added tests for 'SUB of OR and AND to XOR' fold

[David Bolvansky via llvm-commits]

Author: xbolva00
Date: Wed Sep  4 04:17:08 2019
New Revision: 370878

URL: http://llvm.org/viewvc/llvm-project?rev=370878&view=rev
Log:
[NFC] Added tests for 'SUB of OR and AND to XOR' fold

Added:
    llvm/trunk/test/Transforms/InstCombine/sub-or-and-xor.ll

Added: llvm/trunk/test/Transforms/InstCombine/sub-or-and-xor.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/sub-or-and-xor.ll?rev=370878&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/sub-or-and-xor.ll (added)
+++ llvm/trunk/test/Transforms/InstCombine/sub-or-and-xor.ll Wed Sep  4 04:17:08 2019
@@ -0,0 +1,103 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -instcombine -S < %s | FileCheck %s
+
+declare void @use(i32)
+
+define i32 @sub_to_xor(i32 %x, i32 %y) {
+; CHECK-LABEL: @sub_to_xor(
+; CHECK-NEXT:    [[OR:%.*]] = or i32 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[AND:%.*]] = and i32 [[X]], [[Y]]
+; CHECK-NEXT:    [[SUB:%.*]] = sub i32 [[OR]], [[AND]]
+; CHECK-NEXT:    ret i32 [[SUB]]
+;
+  %or = or i32 %x, %y
+  %and = and i32 %x, %y
+  %sub = sub i32 %or, %and
+  ret i32 %sub
+}
+
+define i32 @sub_to_xor_extra_use_sub(i32 %x, i32 %y) {
+; CHECK-LABEL: @sub_to_xor_extra_use_sub(
+; CHECK-NEXT:    [[OR:%.*]] = or i32 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[AND:%.*]] = and i32 [[X]], [[Y]]
+; CHECK-NEXT:    [[SUB:%.*]] = sub i32 [[OR]], [[AND]]
+; CHECK-NEXT:    call void @use(i32 [[SUB]])
+; CHECK-NEXT:    ret i32 [[SUB]]
+;
+  %or = or i32 %x, %y
+  %and = and i32 %x, %y
+  %sub = sub i32 %or, %and
+  call void @use(i32 %sub)
+  ret i32 %sub
+}
+
+define i32 @sub_to_xor_extra_use_and(i32 %x, i32 %y) {
+; CHECK-LABEL: @sub_to_xor_extra_use_and(
+; CHECK-NEXT:    [[OR:%.*]] = or i32 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[AND:%.*]] = and i32 [[X]], [[Y]]
+; CHECK-NEXT:    call void @use(i32 [[AND]])
+; CHECK-NEXT:    [[SUB:%.*]] = sub i32 [[OR]], [[AND]]
+; CHECK-NEXT:    ret i32 [[SUB]]
+;
+  %or = or i32 %x, %y
+  %and = and i32 %x, %y
+  call void @use(i32 %and)
+  %sub = sub i32 %or, %and
+  ret i32 %sub
+}
+
+define i32 @sub_to_xor_extra_use_or(i32 %x, i32 %y) {
+; CHECK-LABEL: @sub_to_xor_extra_use_or(
+; CHECK-NEXT:    [[OR:%.*]] = or i32 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    call void @use(i32 [[OR]])
+; CHECK-NEXT:    [[AND:%.*]] = and i32 [[X]], [[Y]]
+; CHECK-NEXT:    [[SUB:%.*]] = sub i32 [[OR]], [[AND]]
+; CHECK-NEXT:    ret i32 [[SUB]]
+;
+  %or = or i32 %x, %y
+  call void @use(i32 %or)
+  %and = and i32 %x, %y
+  %sub = sub i32 %or, %and
+  ret i32 %sub
+}
+
+define i32 @sub_to_xor_or_commuted(i32 %x, i32 %y) {
+; CHECK-LABEL: @sub_to_xor_or_commuted(
+; CHECK-NEXT:    [[OR:%.*]] = or i32 [[Y:%.*]], [[X:%.*]]
+; CHECK-NEXT:    [[AND:%.*]] = and i32 [[X]], [[Y]]
+; CHECK-NEXT:    [[SUB:%.*]] = sub i32 [[OR]], [[AND]]
+; CHECK-NEXT:    ret i32 [[SUB]]
+;
+  %or = or i32 %y, %x
+  %and = and i32 %x, %y
+  %sub = sub i32 %or, %and
+  ret i32 %sub
+}
+
+define <2 x i32> @sub_to_xor_vec(<2 x i32> %x, <2 x i32> %y) {
+; CHECK-LABEL: @sub_to_xor_vec(
+; CHECK-NEXT:    [[OR:%.*]] = or <2 x i32> [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[AND:%.*]] = and <2 x i32> [[Y]], [[X]]
+; CHECK-NEXT:    [[SUB:%.*]] = sub <2 x i32> [[OR]], [[AND]]
+; CHECK-NEXT:    ret <2 x i32> [[SUB]]
+;
+  %or = or <2 x i32> %x, %y
+  %and = and <2 x i32> %y, %x
+  %sub = sub <2 x i32> %or, %and
+  ret <2 x i32> %sub
+}
+
+; Negative tests
+
+define i32 @sub_to_xor_wrong_sub(i32 %x, i32 %y) {
+; CHECK-LABEL: @sub_to_xor_wrong_sub(
+; CHECK-NEXT:    [[OR:%.*]] = or i32 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[AND:%.*]] = and i32 [[X]], [[Y]]
+; CHECK-NEXT:    [[SUB:%.*]] = sub i32 [[AND]], [[OR]]
+; CHECK-NEXT:    ret i32 [[SUB]]
+;
+  %or = or i32 %x, %y
+  %and = and i32 %x, %y
+  %sub = sub i32 %and, %or
+  ret i32 %sub
+}