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[clang][Interp] Implement __builtin_parity #71662

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Merged
merged 1 commit into from
Nov 16, 2023
Merged

[clang][Interp] Implement __builtin_parity #71662

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16 changes: 16 additions & 0 deletions clang/lib/AST/Interp/InterpBuiltin.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -439,6 +439,15 @@ static bool interp__builtin_popcount(InterpState &S, CodePtr OpPC,
return true;
}

static bool interp__builtin_parity(InterpState &S, CodePtr OpPC,
const InterpFrame *Frame,
const Function *Func, const CallExpr *Call) {
PrimType ArgT = *S.getContext().classify(Call->getArg(0)->getType());
APSInt Val = peekToAPSInt(S.Stk, ArgT);
pushInt(S, Val.popcount() % 2);
return true;
}

bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const Function *F,
const CallExpr *Call) {
InterpFrame *Frame = S.Current;
Expand Down Expand Up @@ -576,6 +585,13 @@ bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const Function *F,
return retInt(S, OpPC, Dummy);
break;

case Builtin::BI__builtin_parity:
case Builtin::BI__builtin_parityl:
case Builtin::BI__builtin_parityll:
if (interp__builtin_parity(S, OpPC, Frame, F, Call))
return retInt(S, OpPC, Dummy);
break;

default:
return false;
}
Expand Down
17 changes: 16 additions & 1 deletion clang/test/AST/Interp/builtin-functions.cpp
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Expand Up @@ -274,6 +274,7 @@ namespace SourceLocation {
}
}

#define BITSIZE(x) (sizeof(x) * 8)
namespace popcount {
static_assert(__builtin_popcount(~0u) == __CHAR_BIT__ * sizeof(unsigned int), "");
static_assert(__builtin_popcount(0) == 0, "");
Expand All @@ -283,7 +284,6 @@ namespace popcount {
static_assert(__builtin_popcountll(0) == 0, "");

/// From test/Sema/constant-builtins-2.c
#define BITSIZE(x) (sizeof(x) * 8)
char popcount1[__builtin_popcount(0) == 0 ? 1 : -1];
char popcount2[__builtin_popcount(0xF0F0) == 8 ? 1 : -1];
char popcount3[__builtin_popcount(~0) == BITSIZE(int) ? 1 : -1];
Expand All @@ -295,3 +295,18 @@ namespace popcount {
char popcount9[__builtin_popcountll(0xF0F0LL) == 8 ? 1 : -1];
char popcount10[__builtin_popcountll(~0LL) == BITSIZE(long long) ? 1 : -1];
}

namespace parity {
/// From test/Sema/constant-builtins-2.c
char parity1[__builtin_parity(0) == 0 ? 1 : -1];
char parity2[__builtin_parity(0xb821) == 0 ? 1 : -1];
char parity3[__builtin_parity(0xb822) == 0 ? 1 : -1];
char parity4[__builtin_parity(0xb823) == 1 ? 1 : -1];
char parity5[__builtin_parity(0xb824) == 0 ? 1 : -1];
char parity6[__builtin_parity(0xb825) == 1 ? 1 : -1];
char parity7[__builtin_parity(0xb826) == 1 ? 1 : -1];
char parity8[__builtin_parity(~0) == 0 ? 1 : -1];
char parity9[__builtin_parityl(1L << (BITSIZE(long) - 1)) == 1 ? 1 : -1];
char parity10[__builtin_parityll(1LL << (BITSIZE(long long) - 1)) == 1 ? 1 : -1];
}