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Revert "[InstSimplify] Fold A|B | (A^B) --> A|B" 

This reverts commit 193c40e966.
This commit is contained in:
Stanislav Mekhanoshin 2021-11-15 14:56:20 -08:00
parent 9809c6c61c
commit 833cdb0a07
2 changed files with 6 additions and 43 deletions
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13
llvm/lib/Analysis/InstructionSimplify.cpp
View File

@ -2265,19 +2265,6 @@ static Value *SimplifyOrInst(Value *Op0, Value *Op1, const SimplifyQuery &Q,
match(Op0, m_c_Xor(m_Not(m_Specific(A)), m_Specific(B)))))
return Op0;
// (A | B) | (A ^ B) --> A | B
// (B | A) | (A ^ B) --> B | A
if (match(Op1, m_Xor(m_Value(A), m_Value(B))) &&
match(Op0, m_c_Or(m_Specific(A), m_Specific(B))))
return Op0;
// Commute the outer 'or' operands.
// (A ^ B) | (A | B) --> A | B
// (A ^ B) | (B | A) --> B | A
if (match(Op0, m_Xor(m_Value(A), m_Value(B))) &&
match(Op1, m_c_Or(m_Specific(A), m_Specific(B))))
return Op1;
// (~A & B) | ~(A | B) --> ~A
// (~A & B) | ~(B | A) --> ~A
// (B & ~A) | ~(A | B) --> ~A

36
llvm/test/Transforms/InstSimplify/or.ll
View File

@ -451,7 +451,9 @@ define i32 @and_or_not_or8(i32 %A, i32 %B) {
define i69 @or_or_xor(i69 %A, i69 %B) {
; CHECK-LABEL: @or_or_xor(
; CHECK-NEXT: [[I1:%.*]] = or i69 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT: ret i69 [[I1]]
; CHECK-NEXT: [[I2:%.*]] = xor i69 [[A]], [[B]]
; CHECK-NEXT: [[I3:%.*]] = or i69 [[I1]], [[I2]]
; CHECK-NEXT: ret i69 [[I3]]
;
%i1 = or i69 %A, %B
%i2 = xor i69 %A, %B
@ -459,25 +461,12 @@ define i69 @or_or_xor(i69 %A, i69 %B) {
ret i69 %i3
}
; (B | A) | (A ^ B) --> B | A
define i8 @or_or_xor_inner_or_commuted(i8 %A, i8 %B) {
; CHECK-LABEL: @or_or_xor_inner_or_commuted(
; CHECK-NEXT: [[I1:%.*]] = or i8 [[B:%.*]], [[A:%.*]]
; CHECK-NEXT: ret i8 [[I1]]
;
%i1 = or i8 %B, %A
%i2 = xor i8 %A, %B
%i3 = or i8 %i1, %i2
ret i8 %i3
}
; (A ^ B) | (A | B) --> A | B
define <4 x i4> @or_or_xor_commuted(<4 x i4> %A, <4 x i4> %B) {
; CHECK-LABEL: @or_or_xor_commuted(
; CHECK-NEXT: [[I1:%.*]] = or <4 x i4> [[A:%.*]], [[B:%.*]]
; CHECK-NEXT: ret <4 x i4> [[I1]]
; CHECK-NEXT: [[I2:%.*]] = xor <4 x i4> [[A]], [[B]]
; CHECK-NEXT: [[I3:%.*]] = or <4 x i4> [[I2]], [[I1]]
; CHECK-NEXT: ret <4 x i4> [[I3]]
;
%i1 = or <4 x i4> %A, %B
%i2 = xor <4 x i4> %A, %B
@ -485,19 +474,6 @@ define <4 x i4> @or_or_xor_commuted(<4 x i4> %A, <4 x i4> %B) {
ret <4 x i4> %i3
}
; (A ^ B) | (B | A) --> B | A
define i4 @or_or_xor_inner_or_outer_or_commuted(i4 %A, i4 %B) {
; CHECK-LABEL: @or_or_xor_inner_or_outer_or_commuted(
; CHECK-NEXT: [[I1:%.*]] = or i4 [[B:%.*]], [[A:%.*]]
; CHECK-NEXT: ret i4 [[I1]]
;
%i1 = or i4 %B, %A
%i2 = xor i4 %A, %B
%i3 = or i4 %i2, %i1
ret i4 %i3
}
define i32 @shifted_all_ones(i32 %shamt) {
; CHECK-LABEL: @shifted_all_ones(
; CHECK-NEXT: ret i32 -1