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[clang][Interp] Implement __builtin_clrsb #72243

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Merged
merged 1 commit into from
Nov 16, 2023
Merged

[clang][Interp] Implement __builtin_clrsb #72243

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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 @@ -448,6 +448,15 @@ static bool interp__builtin_parity(InterpState &S, CodePtr OpPC,
return true;
}

static bool interp__builtin_clrsb(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.getBitWidth() - Val.getSignificantBits());
return true;
}

bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const Function *F,
const CallExpr *Call) {
InterpFrame *Frame = S.Current;
Expand Down Expand Up @@ -592,6 +601,13 @@ bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const Function *F,
return retInt(S, OpPC, Dummy);
break;

case Builtin::BI__builtin_clrsb:
case Builtin::BI__builtin_clrsbl:
case Builtin::BI__builtin_clrsbll:
if (interp__builtin_clrsb(S, OpPC, Frame, F, Call))
return retInt(S, OpPC, Dummy);
break;

default:
return false;
}
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14 changes: 14 additions & 0 deletions clang/test/AST/Interp/builtin-functions.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -310,3 +310,17 @@ namespace parity {
char parity10[__builtin_parityll(1LL << (BITSIZE(long long) - 1)) == 1 ? 1 : -1];
}

namespace clrsb {
char clrsb1[__builtin_clrsb(0) == BITSIZE(int) - 1 ? 1 : -1];
char clrsb2[__builtin_clrsbl(0L) == BITSIZE(long) - 1 ? 1 : -1];
char clrsb3[__builtin_clrsbll(0LL) == BITSIZE(long long) - 1 ? 1 : -1];
char clrsb4[__builtin_clrsb(~0) == BITSIZE(int) - 1 ? 1 : -1];
char clrsb5[__builtin_clrsbl(~0L) == BITSIZE(long) - 1 ? 1 : -1];
char clrsb6[__builtin_clrsbll(~0LL) == BITSIZE(long long) - 1 ? 1 : -1];
char clrsb7[__builtin_clrsb(1) == BITSIZE(int) - 2 ? 1 : -1];
char clrsb8[__builtin_clrsb(~1) == BITSIZE(int) - 2 ? 1 : -1];
char clrsb9[__builtin_clrsb(1 << (BITSIZE(int) - 1)) == 0 ? 1 : -1];
char clrsb10[__builtin_clrsb(~(1 << (BITSIZE(int) - 1))) == 0 ? 1 : -1];
char clrsb11[__builtin_clrsb(0xf) == BITSIZE(int) - 5 ? 1 : -1];
char clrsb12[__builtin_clrsb(~0x1f) == BITSIZE(int) - 6 ? 1 : -1];
}