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[clang][x86][bytecode] Replace interp__builtin_rotate with static bool interp__builtin_elementwise_int_binop callback #160289 #161924

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Merged
merged 4 commits into from
Oct 6, 2025
Merged

[clang][x86][bytecode] Replace interp__builtin_rotate with static bool interp__builtin_elementwise_int_binop callback #160289 #161924

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6a347f6
llvm#160289 added new rotate right and left helper functions and chan…
rdez13 Oct 3, 2025
ffb2a3f
llvm#160289 removed helper functions and used non capturing lambdas i…
rdez13 Oct 4, 2025
1132144
llvm#160289 computed amount as B.urem(A.getBitWidth()) to match previ…
rdez13 Oct 4, 2025
1e18ebe
llvm#160289 replaced A and B with Value and Amount, removed the expli…
rdez13 Oct 6, 2025
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18 changes: 16 additions & 2 deletions clang/lib/AST/ByteCode/InterpBuiltin.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -56,6 +56,20 @@ static APSInt popToAPSInt(InterpState &S, QualType T) {
return popToAPSInt(S.Stk, *S.getContext().classify(T));
}

static APInt ROTL_fn(const APSInt &A, const APSInt &B) {
const APInt &X = static_cast<const APInt &>(A);
const unsigned BW = X.getBitWidth();
const uint64_t Amt = B.getZExtValue();
return X.rotl(static_cast<unsigned>(Amt % BW));
}

static APInt ROTR_fn(const APSInt &A, const APSInt &B) {
const APInt &X = static_cast<const APInt &>(A);
const unsigned BW = X.getBitWidth();
const uint64_t Amt = B.getZExtValue();
return X.rotr(static_cast<unsigned>(Amt % BW));
}

/// Pushes \p Val on the stack as the type given by \p QT.
static void pushInteger(InterpState &S, const APSInt &Val, QualType QT) {
assert(QT->isSignedIntegerOrEnumerationType() ||
Expand Down Expand Up @@ -3162,7 +3176,7 @@ bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const CallExpr *Call,
case Builtin::BI_rotl:
case Builtin::BI_lrotl:
case Builtin::BI_rotl64:
return interp__builtin_rotate(S, OpPC, Frame, Call, /*Right=*/false);
return interp__builtin_elementwise_int_binop(S, OpPC, Call, ROTL_fn);

case Builtin::BI__builtin_rotateright8:
case Builtin::BI__builtin_rotateright16:
Expand All @@ -3173,7 +3187,7 @@ bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const CallExpr *Call,
case Builtin::BI_rotr:
case Builtin::BI_lrotr:
case Builtin::BI_rotr64:
return interp__builtin_rotate(S, OpPC, Frame, Call, /*Right=*/true);
return interp__builtin_elementwise_int_binop(S, OpPC, Call, ROTR_fn);

case Builtin::BI__builtin_ffs:
case Builtin::BI__builtin_ffsl:
Expand Down
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