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[InstSimplify] Add patterns for folding (A & B) | (~A ^ B) -> (~A ^ B) and its commuted variants.

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We already had (A & ~B) | (A ^ B), but we missed the cases where the not was part of the xor.

llvm-svn: 303004
This commit is contained in:
Craig Topper 2017-05-14 07:54:43 +00:00
parent 3da63abd9f
commit 6c2eb35d5e
2 changed files with 34 additions and 32 deletions
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18
lib/Analysis/InstructionSimplify.cpp
View File

@ -1870,6 +1870,24 @@ static Value *SimplifyOrInst(Value *Op0, Value *Op1, const SimplifyQuery &Q,
match(Op1, m_c_And(m_Not(m_Specific(A)), m_Specific(B)))))
return Op0;
// (A & B) | (~A ^ B) -> (~A ^ B)
// (B & A) | (~A ^ B) -> (~A ^ B)
// (A & B) | (B ^ ~A) -> (B ^ ~A)
// (B & A) | (B ^ ~A) -> (B ^ ~A)
if (match(Op0, m_And(m_Value(A), m_Value(B))) &&
(match(Op1, m_c_Xor(m_Specific(A), m_Not(m_Specific(B)))) ||
match(Op1, m_c_Xor(m_Not(m_Specific(A)), m_Specific(B)))))
return Op1;
// (~A ^ B) | (A & B) -> (~A ^ B)
// (~A ^ B) | (B & A) -> (~A ^ B)
// (B ^ ~A) | (A & B) -> (B ^ ~A)
// (B ^ ~A) | (B & A) -> (B ^ ~A)
if (match(Op1, m_And(m_Value(A), m_Value(B))) &&
(match(Op0, m_c_Xor(m_Specific(A), m_Not(m_Specific(B)))) ||
match(Op0, m_c_Xor(m_Not(m_Specific(A)), m_Specific(B)))))
return Op0;
if (Value *V = simplifyAndOrOfICmps(Op0, Op1, false))
return V;

48
test/Transforms/InstSimplify/AndOrXor.ll
View File

@ -634,10 +634,8 @@ define i32 @test46_commuted_and(i32 %a, i32 %b) {
define i32 @test47(i32 %a, i32 %b) {
; CHECK-LABEL: @test47(
; CHECK-NEXT: [[NEGA:%.*]] = xor i32 [[A:%.*]], -1
; CHECK-NEXT: [[AND:%.*]] = and i32 [[A]], [[B:%.*]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[NEGA]], [[B]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[XOR]], [[AND]]
; CHECK-NEXT: ret i32 [[OR]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[NEGA]], [[B:%.*]]
; CHECK-NEXT: ret i32 [[XOR]]
;
%nega = xor i32 %a, -1
%and = and i32 %a, %b
@ -649,10 +647,8 @@ define i32 @test47(i32 %a, i32 %b) {
define i32 @test48(i32 %a, i32 %b) {
; CHECK-LABEL: @test48(
; CHECK-NEXT: [[NEGA:%.*]] = xor i32 [[A:%.*]], -1
; CHECK-NEXT: [[AND:%.*]] = and i32 [[A]], [[B:%.*]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[B]], [[NEGA]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[XOR]], [[AND]]
; CHECK-NEXT: ret i32 [[OR]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[B:%.*]], [[NEGA]]
; CHECK-NEXT: ret i32 [[XOR]]
;
%nega = xor i32 %a, -1
%and = and i32 %a, %b
@ -664,10 +660,8 @@ define i32 @test48(i32 %a, i32 %b) {
define i32 @test49(i32 %a, i32 %b) {
; CHECK-LABEL: @test49(
; CHECK-NEXT: [[NEGA:%.*]] = xor i32 [[A:%.*]], -1
; CHECK-NEXT: [[AND:%.*]] = and i32 [[B:%.*]], [[A]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[B]], [[NEGA]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[XOR]], [[AND]]
; CHECK-NEXT: ret i32 [[OR]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[B:%.*]], [[NEGA]]
; CHECK-NEXT: ret i32 [[XOR]]
;
%nega = xor i32 %a, -1
%and = and i32 %b, %a
@ -679,10 +673,8 @@ define i32 @test49(i32 %a, i32 %b) {
define i32 @test50(i32 %a, i32 %b) {
; CHECK-LABEL: @test50(
; CHECK-NEXT: [[NEGA:%.*]] = xor i32 [[A:%.*]], -1
; CHECK-NEXT: [[AND:%.*]] = and i32 [[B:%.*]], [[A]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[NEGA]], [[B]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[XOR]], [[AND]]
; CHECK-NEXT: ret i32 [[OR]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[NEGA]], [[B:%.*]]
; CHECK-NEXT: ret i32 [[XOR]]
;
%nega = xor i32 %a, -1
%and = and i32 %b, %a
@ -694,10 +686,8 @@ define i32 @test50(i32 %a, i32 %b) {
define i32 @test51(i32 %a, i32 %b) {
; CHECK-LABEL: @test51(
; CHECK-NEXT: [[NEGA:%.*]] = xor i32 [[A:%.*]], -1
; CHECK-NEXT: [[AND:%.*]] = and i32 [[A]], [[B:%.*]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[NEGA]], [[B]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[AND]], [[XOR]]
; CHECK-NEXT: ret i32 [[OR]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[NEGA]], [[B:%.*]]
; CHECK-NEXT: ret i32 [[XOR]]
;
%nega = xor i32 %a, -1
%and = and i32 %a, %b
@ -709,10 +699,8 @@ define i32 @test51(i32 %a, i32 %b) {
define i32 @test52(i32 %a, i32 %b) {
; CHECK-LABEL: @test52(
; CHECK-NEXT: [[NEGA:%.*]] = xor i32 [[A:%.*]], -1
; CHECK-NEXT: [[AND:%.*]] = and i32 [[A]], [[B:%.*]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[B]], [[NEGA]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[AND]], [[XOR]]
; CHECK-NEXT: ret i32 [[OR]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[B:%.*]], [[NEGA]]
; CHECK-NEXT: ret i32 [[XOR]]
;
%nega = xor i32 %a, -1
%and = and i32 %a, %b
@ -724,10 +712,8 @@ define i32 @test52(i32 %a, i32 %b) {
define i32 @test53(i32 %a, i32 %b) {
; CHECK-LABEL: @test53(
; CHECK-NEXT: [[NEGA:%.*]] = xor i32 [[A:%.*]], -1
; CHECK-NEXT: [[AND:%.*]] = and i32 [[B:%.*]], [[A]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[B]], [[NEGA]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[AND]], [[XOR]]
; CHECK-NEXT: ret i32 [[OR]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[B:%.*]], [[NEGA]]
; CHECK-NEXT: ret i32 [[XOR]]
;
%nega = xor i32 %a, -1
%and = and i32 %b, %a
@ -739,10 +725,8 @@ define i32 @test53(i32 %a, i32 %b) {
define i32 @test54(i32 %a, i32 %b) {
; CHECK-LABEL: @test54(
; CHECK-NEXT: [[NEGA:%.*]] = xor i32 [[A:%.*]], -1
; CHECK-NEXT: [[AND:%.*]] = and i32 [[B:%.*]], [[A]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[NEGA]], [[B]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[AND]], [[XOR]]
; CHECK-NEXT: ret i32 [[OR]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[NEGA]], [[B:%.*]]
; CHECK-NEXT: ret i32 [[XOR]]
;
%nega = xor i32 %a, -1
%and = and i32 %b, %a