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[InstCombine] Remove foldSelectICmpEq() fold #122098

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Jan 9, 2025
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[InstCombine] Remove foldSelectICmpEq() fold #122098

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86 changes: 0 additions & 86 deletions llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1843,92 +1843,6 @@ static Instruction *foldSelectICmpEq(SelectInst &SI, ICmpInst *ICI,
foldSelectWithExtremeEqCond(CmpLHS, CmpRHS, TrueVal, FalseVal))
return Res;

// Transform (X == C) ? X : Y -> (X == C) ? C : Y
// specific handling for Bitwise operation.
// x&y -> (x|y) ^ (x^y) or (x|y) & ~(x^y)
// x|y -> (x&y) | (x^y) or (x&y) ^ (x^y)
// x^y -> (x|y) ^ (x&y) or (x|y) & ~(x&y)
Value *X, *Y;
if (!match(CmpLHS, m_BitwiseLogic(m_Value(X), m_Value(Y))) ||
!match(TrueVal, m_c_BitwiseLogic(m_Specific(X), m_Specific(Y))))
return nullptr;

const unsigned AndOps = Instruction::And, OrOps = Instruction::Or,
XorOps = Instruction::Xor, NoOps = 0;
enum NotMask { None = 0, NotInner, NotRHS };

auto matchFalseVal = [&](unsigned OuterOpc, unsigned InnerOpc,
unsigned NotMask) {
auto matchInner = m_c_BinOp(InnerOpc, m_Specific(X), m_Specific(Y));
if (OuterOpc == NoOps)
return match(CmpRHS, m_Zero()) && match(FalseVal, matchInner);

if (NotMask == NotInner) {
return match(FalseVal, m_c_BinOp(OuterOpc, m_NotForbidPoison(matchInner),
m_Specific(CmpRHS)));
} else if (NotMask == NotRHS) {
return match(FalseVal, m_c_BinOp(OuterOpc, matchInner,
m_NotForbidPoison(m_Specific(CmpRHS))));
} else {
return match(FalseVal,
m_c_BinOp(OuterOpc, matchInner, m_Specific(CmpRHS)));
}
};

// (X&Y)==C ? X|Y : X^Y -> (X^Y)|C : X^Y or (X^Y)^ C : X^Y
// (X&Y)==C ? X^Y : X|Y -> (X|Y)^C : X|Y or (X|Y)&~C : X|Y
if (match(CmpLHS, m_And(m_Value(X), m_Value(Y)))) {
if (match(TrueVal, m_c_Or(m_Specific(X), m_Specific(Y)))) {
// (X&Y)==C ? X|Y : (X^Y)|C -> (X^Y)|C : (X^Y)|C -> (X^Y)|C
// (X&Y)==C ? X|Y : (X^Y)^C -> (X^Y)^C : (X^Y)^C -> (X^Y)^C
if (matchFalseVal(OrOps, XorOps, None) ||
matchFalseVal(XorOps, XorOps, None))
return IC.replaceInstUsesWith(SI, FalseVal);
} else if (match(TrueVal, m_c_Xor(m_Specific(X), m_Specific(Y)))) {
// (X&Y)==C ? X^Y : (X|Y)^ C -> (X|Y)^ C : (X|Y)^ C -> (X|Y)^ C
// (X&Y)==C ? X^Y : (X|Y)&~C -> (X|Y)&~C : (X|Y)&~C -> (X|Y)&~C
if (matchFalseVal(XorOps, OrOps, None) ||
matchFalseVal(AndOps, OrOps, NotRHS))
return IC.replaceInstUsesWith(SI, FalseVal);
}
}

// (X|Y)==C ? X&Y : X^Y -> (X^Y)^C : X^Y or ~(X^Y)&C : X^Y
// (X|Y)==C ? X^Y : X&Y -> (X&Y)^C : X&Y or ~(X&Y)&C : X&Y
if (match(CmpLHS, m_Or(m_Value(X), m_Value(Y)))) {
if (match(TrueVal, m_c_And(m_Specific(X), m_Specific(Y)))) {
// (X|Y)==C ? X&Y: (X^Y)^C -> (X^Y)^C: (X^Y)^C -> (X^Y)^C
// (X|Y)==C ? X&Y:~(X^Y)&C ->~(X^Y)&C:~(X^Y)&C -> ~(X^Y)&C
if (matchFalseVal(XorOps, XorOps, None) ||
matchFalseVal(AndOps, XorOps, NotInner))
return IC.replaceInstUsesWith(SI, FalseVal);
} else if (match(TrueVal, m_c_Xor(m_Specific(X), m_Specific(Y)))) {
// (X|Y)==C ? X^Y : (X&Y)^C -> (X&Y)^C : (X&Y)^C -> (X&Y)^C
// (X|Y)==C ? X^Y :~(X&Y)&C -> ~(X&Y)&C :~(X&Y)&C -> ~(X&Y)&C
if (matchFalseVal(XorOps, AndOps, None) ||
matchFalseVal(AndOps, AndOps, NotInner))
return IC.replaceInstUsesWith(SI, FalseVal);
}
}

// (X^Y)==C ? X&Y : X|Y -> (X|Y)^C : X|Y or (X|Y)&~C : X|Y
// (X^Y)==C ? X|Y : X&Y -> (X&Y)|C : X&Y or (X&Y)^ C : X&Y
if (match(CmpLHS, m_Xor(m_Value(X), m_Value(Y)))) {
if ((match(TrueVal, m_c_And(m_Specific(X), m_Specific(Y))))) {
// (X^Y)==C ? X&Y : (X|Y)^C -> (X|Y)^C
// (X^Y)==C ? X&Y : (X|Y)&~C -> (X|Y)&~C
if (matchFalseVal(XorOps, OrOps, None) ||
matchFalseVal(AndOps, OrOps, NotRHS))
return IC.replaceInstUsesWith(SI, FalseVal);
} else if (match(TrueVal, m_c_Or(m_Specific(X), m_Specific(Y)))) {
// (X^Y)==C ? (X|Y) : (X&Y)|C -> (X&Y)|C
// (X^Y)==C ? (X|Y) : (X&Y)^C -> (X&Y)^C
if (matchFalseVal(OrOps, AndOps, None) ||
matchFalseVal(XorOps, AndOps, None))
return IC.replaceInstUsesWith(SI, FalseVal);
}
}

return nullptr;
}

Expand Down
144 changes: 102 additions & 42 deletions llvm/test/Transforms/InstCombine/select.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -3841,9 +3841,13 @@ entry:
define i32 @src_and_eq_C_or_xororC(i32 %x, i32 %y, i32 %c) {
; CHECK-LABEL: @src_and_eq_C_or_xororC(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[OR1:%.*]] = or i32 [[XOR]], [[C:%.*]]
; CHECK-NEXT: ret i32 [[OR1]]
; CHECK-NEXT: [[AND:%.*]] = and i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[AND]], [[C:%.*]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[Y]], [[X]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[Y]], [[X]]
; CHECK-NEXT: [[OR1:%.*]] = or i32 [[XOR]], [[C]]
; CHECK-NEXT: [[COND:%.*]] = select i1 [[CMP]], i32 [[OR]], i32 [[OR1]]
; CHECK-NEXT: ret i32 [[COND]]
;
entry:
%and = and i32 %y, %x
Expand All @@ -3858,9 +3862,13 @@ entry:
define i32 @src_and_eq_C_or_xorxorC(i32 %x, i32 %y, i32 %c) {
; CHECK-LABEL: @src_and_eq_C_or_xorxorC(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[XOR1:%.*]] = xor i32 [[XOR]], [[C:%.*]]
; CHECK-NEXT: ret i32 [[XOR1]]
; CHECK-NEXT: [[AND:%.*]] = and i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[AND]], [[C:%.*]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[Y]], [[X]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[Y]], [[X]]
; CHECK-NEXT: [[XOR1:%.*]] = xor i32 [[XOR]], [[C]]
; CHECK-NEXT: [[COND:%.*]] = select i1 [[CMP]], i32 [[OR]], i32 [[XOR1]]
; CHECK-NEXT: ret i32 [[COND]]
;
entry:
%and = and i32 %y, %x
Expand All @@ -3875,10 +3883,14 @@ entry:
define i32 @src_and_eq_C_xor_OrAndNotC(i32 %x, i32 %y, i32 %c) {
; CHECK-LABEL: @src_and_eq_C_xor_OrAndNotC(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[OR:%.*]] = or i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[NOT:%.*]] = xor i32 [[C:%.*]], -1
; CHECK-NEXT: [[AND:%.*]] = and i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[AND]], [[C:%.*]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[Y]], [[X]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[Y]], [[X]]
; CHECK-NEXT: [[NOT:%.*]] = xor i32 [[C]], -1
; CHECK-NEXT: [[AND1:%.*]] = and i32 [[OR]], [[NOT]]
; CHECK-NEXT: ret i32 [[AND1]]
; CHECK-NEXT: [[COND:%.*]] = select i1 [[CMP]], i32 [[XOR]], i32 [[AND1]]
; CHECK-NEXT: ret i32 [[COND]]
;
entry:
%and = and i32 %y, %x
Expand Down Expand Up @@ -3917,9 +3929,13 @@ entry:
define i32 @src_and_eq_C_xor_orxorC(i32 %x, i32 %y, i32 %c) {
; CHECK-LABEL: @src_and_eq_C_xor_orxorC(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[OR:%.*]] = or i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[XOR1:%.*]] = xor i32 [[OR]], [[C:%.*]]
; CHECK-NEXT: ret i32 [[XOR1]]
; CHECK-NEXT: [[AND:%.*]] = and i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[AND]], [[C:%.*]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[Y]], [[X]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[Y]], [[X]]
; CHECK-NEXT: [[XOR1:%.*]] = xor i32 [[OR]], [[C]]
; CHECK-NEXT: [[COND:%.*]] = select i1 [[CMP]], i32 [[XOR]], i32 [[XOR1]]
; CHECK-NEXT: ret i32 [[COND]]
;
entry:
%and = and i32 %y, %x
Expand Down Expand Up @@ -3968,9 +3984,13 @@ entry:
define i32 @src_or_eq_neg1_and_xor(i32 %x, i32 %y) {
; CHECK-LABEL: @src_or_eq_neg1_and_xor(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = xor i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[OR]], -1
; CHECK-NEXT: [[AND:%.*]] = and i32 [[Y]], [[X]]
; CHECK-NEXT: [[TMP0:%.*]] = xor i32 [[X]], [[Y]]
; CHECK-NEXT: [[NOT:%.*]] = xor i32 [[TMP0]], -1
; CHECK-NEXT: ret i32 [[NOT]]
; CHECK-NEXT: [[COND:%.*]] = select i1 [[CMP]], i32 [[AND]], i32 [[NOT]]
; CHECK-NEXT: ret i32 [[COND]]
;
entry:
%or = or i32 %y, %x
Expand All @@ -3985,9 +4005,13 @@ entry:
define i32 @src_or_eq_neg1_xor_and(i32 %x, i32 %y) {
; CHECK-LABEL: @src_or_eq_neg1_xor_and(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[AND:%.*]] = and i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[OR]], -1
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[Y]], [[X]]
; CHECK-NEXT: [[AND:%.*]] = and i32 [[Y]], [[X]]
; CHECK-NEXT: [[NOT:%.*]] = xor i32 [[AND]], -1
; CHECK-NEXT: ret i32 [[NOT]]
; CHECK-NEXT: [[COND:%.*]] = select i1 [[CMP]], i32 [[XOR]], i32 [[NOT]]
; CHECK-NEXT: ret i32 [[COND]]
;
entry:
%or = or i32 %y, %x
Expand All @@ -4002,9 +4026,13 @@ entry:
define i32 @src_or_eq_C_and_xorC(i32 %x, i32 %y, i32 %c) {
; CHECK-LABEL: @src_or_eq_C_and_xorC(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[XOR1:%.*]] = xor i32 [[XOR]], [[C:%.*]]
; CHECK-NEXT: ret i32 [[XOR1]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[OR]], [[C:%.*]]
; CHECK-NEXT: [[AND:%.*]] = and i32 [[Y]], [[X]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[Y]], [[X]]
; CHECK-NEXT: [[XOR1:%.*]] = xor i32 [[XOR]], [[C]]
; CHECK-NEXT: [[COND:%.*]] = select i1 [[CMP]], i32 [[AND]], i32 [[XOR1]]
; CHECK-NEXT: ret i32 [[COND]]
;
entry:
%or = or i32 %y, %x
Expand All @@ -4019,10 +4047,14 @@ entry:
define i32 @src_or_eq_C_and_andnotxorC(i32 %x, i32 %y, i32 %c) {
; CHECK-LABEL: @src_or_eq_C_and_andnotxorC(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = xor i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[OR]], [[C:%.*]]
; CHECK-NEXT: [[AND:%.*]] = and i32 [[Y]], [[X]]
; CHECK-NEXT: [[TMP0:%.*]] = xor i32 [[X]], [[Y]]
; CHECK-NEXT: [[NOT:%.*]] = xor i32 [[TMP0]], -1
; CHECK-NEXT: [[AND1:%.*]] = and i32 [[C:%.*]], [[NOT]]
; CHECK-NEXT: ret i32 [[AND1]]
; CHECK-NEXT: [[AND1:%.*]] = and i32 [[C]], [[NOT]]
; CHECK-NEXT: [[COND:%.*]] = select i1 [[CMP]], i32 [[AND]], i32 [[AND1]]
; CHECK-NEXT: ret i32 [[COND]]
;
entry:
%or = or i32 %y, %x
Expand All @@ -4038,9 +4070,13 @@ entry:
define i32 @src_or_eq_C_xor_xorandC(i32 %x, i32 %y, i32 %c) {
; CHECK-LABEL: @src_or_eq_C_xor_xorandC(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[AND:%.*]] = and i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[XOR1:%.*]] = xor i32 [[AND]], [[C:%.*]]
; CHECK-NEXT: ret i32 [[XOR1]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[OR]], [[C:%.*]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[Y]], [[X]]
; CHECK-NEXT: [[AND:%.*]] = and i32 [[Y]], [[X]]
; CHECK-NEXT: [[XOR1:%.*]] = xor i32 [[AND]], [[C]]
; CHECK-NEXT: [[COND:%.*]] = select i1 [[CMP]], i32 [[XOR]], i32 [[XOR1]]
; CHECK-NEXT: ret i32 [[COND]]
;
entry:
%or = or i32 %y, %x
Expand All @@ -4055,10 +4091,14 @@ entry:
define i32 @src_or_eq_C_xor_andnotandC(i32 %x, i32 %y, i32 %c) {
; CHECK-LABEL: @src_or_eq_C_xor_andnotandC(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[AND:%.*]] = and i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[OR]], [[C:%.*]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[Y]], [[X]]
; CHECK-NEXT: [[AND:%.*]] = and i32 [[Y]], [[X]]
; CHECK-NEXT: [[NOT:%.*]] = xor i32 [[AND]], -1
; CHECK-NEXT: [[AND1:%.*]] = and i32 [[C:%.*]], [[NOT]]
; CHECK-NEXT: ret i32 [[AND1]]
; CHECK-NEXT: [[AND1:%.*]] = and i32 [[C]], [[NOT]]
; CHECK-NEXT: [[COND:%.*]] = select i1 [[CMP]], i32 [[XOR]], i32 [[AND1]]
; CHECK-NEXT: ret i32 [[COND]]
;
entry:
%or = or i32 %y, %x
Expand All @@ -4076,9 +4116,13 @@ entry:
define i32 @src_xor_eq_neg1_and(i32 %x, i32 %y) {
; CHECK-LABEL: @src_xor_eq_neg1_and(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[OR:%.*]] = or i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[XOR]], -1
; CHECK-NEXT: [[AND:%.*]] = and i32 [[Y]], [[X]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[Y]], [[X]]
; CHECK-NEXT: [[NOT:%.*]] = xor i32 [[OR]], -1
; CHECK-NEXT: ret i32 [[NOT]]
; CHECK-NEXT: [[COND:%.*]] = select i1 [[CMP]], i32 [[AND]], i32 [[NOT]]
; CHECK-NEXT: ret i32 [[COND]]
;
entry:
%xor = xor i32 %y, %x
Expand Down Expand Up @@ -4111,9 +4155,13 @@ entry:
define i32 @src_xor_eq_C_and_xororC(i32 %x, i32 %y, i32 %c) {
; CHECK-LABEL: @src_xor_eq_C_and_xororC(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[OR:%.*]] = or i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[XOR1:%.*]] = xor i32 [[OR]], [[C:%.*]]
; CHECK-NEXT: ret i32 [[XOR1]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[XOR]], [[C:%.*]]
; CHECK-NEXT: [[AND:%.*]] = and i32 [[Y]], [[X]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[Y]], [[X]]
; CHECK-NEXT: [[XOR1:%.*]] = xor i32 [[OR]], [[C]]
; CHECK-NEXT: [[COND:%.*]] = select i1 [[CMP]], i32 [[AND]], i32 [[XOR1]]
; CHECK-NEXT: ret i32 [[COND]]
;
entry:
%xor = xor i32 %y, %x
Expand All @@ -4128,10 +4176,14 @@ entry:
define i32 @src_xor_eq_C_and_andornotC(i32 %x, i32 %y, i32 %c) {
; CHECK-LABEL: @src_xor_eq_C_and_andornotC(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[OR:%.*]] = or i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[NOT:%.*]] = xor i32 [[C:%.*]], -1
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[XOR]], [[C:%.*]]
; CHECK-NEXT: [[AND:%.*]] = and i32 [[Y]], [[X]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[Y]], [[X]]
; CHECK-NEXT: [[NOT:%.*]] = xor i32 [[C]], -1
; CHECK-NEXT: [[AND1:%.*]] = and i32 [[OR]], [[NOT]]
; CHECK-NEXT: ret i32 [[AND1]]
; CHECK-NEXT: [[COND:%.*]] = select i1 [[CMP]], i32 [[AND]], i32 [[AND1]]
; CHECK-NEXT: ret i32 [[COND]]
;
entry:
%xor = xor i32 %y, %x
Expand All @@ -4147,9 +4199,13 @@ entry:
define i32 @src_xor_eq_C_or_xorandC(i32 %x, i32 %y, i32 %c) {
; CHECK-LABEL: @src_xor_eq_C_or_xorandC(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[AND:%.*]] = and i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[XOR1:%.*]] = xor i32 [[AND]], [[C:%.*]]
; CHECK-NEXT: ret i32 [[XOR1]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[XOR]], [[C:%.*]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[Y]], [[X]]
; CHECK-NEXT: [[AND:%.*]] = and i32 [[Y]], [[X]]
; CHECK-NEXT: [[XOR1:%.*]] = xor i32 [[AND]], [[C]]
; CHECK-NEXT: [[COND:%.*]] = select i1 [[CMP]], i32 [[OR]], i32 [[XOR1]]
; CHECK-NEXT: ret i32 [[COND]]
;
entry:
%xor = xor i32 %y, %x
Expand All @@ -4164,9 +4220,13 @@ entry:
define i32 @src_xor_eq_C_or_orandC(i32 %x, i32 %y, i32 %c) {
; CHECK-LABEL: @src_xor_eq_C_or_orandC(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[AND:%.*]] = and i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[OR1:%.*]] = or i32 [[AND]], [[C:%.*]]
; CHECK-NEXT: ret i32 [[OR1]]
; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[XOR]], [[C:%.*]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[Y]], [[X]]
; CHECK-NEXT: [[AND:%.*]] = and i32 [[Y]], [[X]]
; CHECK-NEXT: [[OR1:%.*]] = or i32 [[AND]], [[C]]
; CHECK-NEXT: [[COND:%.*]] = select i1 [[CMP]], i32 [[OR]], i32 [[OR1]]
; CHECK-NEXT: ret i32 [[COND]]
;
entry:
%xor = xor i32 %y, %x
Expand Down
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