[PATCH] D114339: [InstCombine] simplify (~A | B) ^ A --> ~( A & B)
Mehrnoosh Heidarpour via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Mon Nov 29 08:31:22 PST 2021
This revision was automatically updated to reflect the committed changes.
Closed by commit rGc572eb1ad9d8: [InstCombine] Fold (~A | B) ^ A --> ~(A & B) (authored by MehrHeidar).
Changed prior to commit:
https://reviews.llvm.org/D114339?vs=390167&id=390379#toc
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D114339/new/
https://reviews.llvm.org/D114339
Files:
llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
llvm/test/Transforms/InstCombine/xor.ll
Index: llvm/test/Transforms/InstCombine/xor.ll
===================================================================
--- llvm/test/Transforms/InstCombine/xor.ll
+++ llvm/test/Transforms/InstCombine/xor.ll
@@ -1236,9 +1236,8 @@
define <2 x i64> @xor_orn(<2 x i64> %a, <2 x i64> %b) {
; CHECK-LABEL: @xor_orn(
-; CHECK-NEXT: [[NOTA:%.*]] = xor <2 x i64> [[A:%.*]], <i64 -1, i64 -1>
-; CHECK-NEXT: [[L:%.*]] = or <2 x i64> [[NOTA]], [[B:%.*]]
-; CHECK-NEXT: [[Z:%.*]] = xor <2 x i64> [[L]], [[A]]
+; CHECK-NEXT: [[TMP1:%.*]] = and <2 x i64> [[A:%.*]], [[B:%.*]]
+; CHECK-NEXT: [[Z:%.*]] = xor <2 x i64> [[TMP1]], <i64 -1, i64 -1>
; CHECK-NEXT: ret <2 x i64> [[Z]]
;
%nota = xor <2 x i64> %a, <i64 -1, i64 -1>
@@ -1252,9 +1251,8 @@
define i8 @xor_orn_commute1(i8 %pa, i8 %b) {
; CHECK-LABEL: @xor_orn_commute1(
; CHECK-NEXT: [[A:%.*]] = udiv i8 42, [[PA:%.*]]
-; CHECK-NEXT: [[NOTA:%.*]] = xor i8 [[A]], -1
-; CHECK-NEXT: [[L:%.*]] = or i8 [[NOTA]], [[B:%.*]]
-; CHECK-NEXT: [[Z:%.*]] = xor i8 [[A]], [[L]]
+; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[A]], [[B:%.*]]
+; CHECK-NEXT: [[Z:%.*]] = xor i8 [[TMP1]], -1
; CHECK-NEXT: ret i8 [[Z]]
;
%a = udiv i8 42, %pa
@@ -1269,9 +1267,8 @@
define i32 @xor_orn_commute2(i32 %a, i32 %pb,i32* %s) {
; CHECK-LABEL: @xor_orn_commute2(
; CHECK-NEXT: [[B:%.*]] = udiv i32 42, [[PB:%.*]]
-; CHECK-NEXT: [[NOTA:%.*]] = xor i32 [[A:%.*]], -1
-; CHECK-NEXT: [[L:%.*]] = or i32 [[B]], [[NOTA]]
-; CHECK-NEXT: [[Z:%.*]] = xor i32 [[L]], [[A]]
+; CHECK-NEXT: [[TMP1:%.*]] = and i32 [[B]], [[A:%.*]]
+; CHECK-NEXT: [[Z:%.*]] = xor i32 [[TMP1]], -1
; CHECK-NEXT: ret i32 [[Z]]
;
%b = udiv i32 42, %pb
@@ -1281,14 +1278,13 @@
ret i32 %z
}
-
define i32 @xor_orn_commute2_1use(i32 %a, i32 %pb,i32* %s) {
; CHECK-LABEL: @xor_orn_commute2_1use(
; CHECK-NEXT: [[B:%.*]] = udiv i32 42, [[PB:%.*]]
; CHECK-NEXT: [[NOTA:%.*]] = xor i32 [[A:%.*]], -1
-; CHECK-NEXT: [[L:%.*]] = or i32 [[B]], [[NOTA]]
; CHECK-NEXT: store i32 [[NOTA]], i32* [[S:%.*]], align 4
-; CHECK-NEXT: [[Z:%.*]] = xor i32 [[L]], [[A]]
+; CHECK-NEXT: [[TMP1:%.*]] = and i32 [[B]], [[A]]
+; CHECK-NEXT: [[Z:%.*]] = xor i32 [[TMP1]], -1
; CHECK-NEXT: ret i32 [[Z]]
;
%b = udiv i32 42, %pb
@@ -1305,9 +1301,8 @@
; CHECK-LABEL: @xor_orn_commute3(
; CHECK-NEXT: [[A:%.*]] = udiv i67 42, [[PA:%.*]]
; CHECK-NEXT: [[B:%.*]] = udiv i67 42, [[PB:%.*]]
-; CHECK-NEXT: [[NOTA:%.*]] = xor i67 [[A]], -1
-; CHECK-NEXT: [[L:%.*]] = or i67 [[B]], [[NOTA]]
-; CHECK-NEXT: [[Z:%.*]] = xor i67 [[A]], [[L]]
+; CHECK-NEXT: [[TMP1:%.*]] = and i67 [[A]], [[B]]
+; CHECK-NEXT: [[Z:%.*]] = xor i67 [[TMP1]], -1
; CHECK-NEXT: ret i67 [[Z]]
;
%a = udiv i67 42, %pa
@@ -1337,7 +1332,6 @@
ret i67 %z
}
-
define i32 @xor_orn_2use(i32 %a, i32 %b, i32* %s1, i32* %s2) {
; CHECK-LABEL: @xor_orn_2use(
; CHECK-NEXT: [[NOTA:%.*]] = xor i32 [[A:%.*]], -1
Index: llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
===================================================================
--- llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
+++ llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
@@ -3623,6 +3623,14 @@
if (match(&I, m_c_Xor(m_c_And(m_Not(m_Value(A)), m_Value(B)), m_Deferred(A))))
return BinaryOperator::CreateOr(A, B);
+ // (~A | B) ^ A --> ~(A & B)
+ if (match(Op0, m_OneUse(m_c_Or(m_Not(m_Specific(Op1)), m_Value(B)))))
+ return BinaryOperator::CreateNot(Builder.CreateAnd(Op1, B));
+
+ // A ^ (~A | B) --> ~(A & B)
+ if (match(Op1, m_OneUse(m_c_Or(m_Not(m_Specific(Op0)), m_Value(B)))))
+ return BinaryOperator::CreateNot(Builder.CreateAnd(Op0, B));
+
// (A | B) ^ (A | C) --> (B ^ C) & ~A -- There are 4 commuted variants.
// TODO: Loosen one-use restriction if common operand is a constant.
Value *D;
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