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[clang][bytecode] Implement lzcnt/tzcnt/bzhi builtins #110639

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merged 1 commit into from
Oct 1, 2024
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[clang][bytecode] Implement lzcnt/tzcnt/bzhi builtins #110639

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59 changes: 59 additions & 0 deletions clang/lib/AST/ByteCode/InterpBuiltin.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1180,6 +1180,45 @@ static bool interp__builtin_ia32_bextr(InterpState &S, CodePtr OpPC,
return true;
}

static bool interp__builtin_ia32_bzhi(InterpState &S, CodePtr OpPC,
const InterpFrame *Frame,
const Function *Func,
const CallExpr *Call) {
PrimType ValT = *S.Ctx.classify(Call->getArg(0));
PrimType IndexT = *S.Ctx.classify(Call->getArg(1));

APSInt Val = peekToAPSInt(S.Stk, ValT,
align(primSize(ValT)) + align(primSize(IndexT)));
APSInt Idx = peekToAPSInt(S.Stk, IndexT);

unsigned BitWidth = Val.getBitWidth();
uint64_t Index = Idx.extractBitsAsZExtValue(8, 0);

if (Index < BitWidth)
Val.clearHighBits(BitWidth - Index);

pushInteger(S, Val, Call->getType());
return true;
}

static bool interp__builtin_ia32_lzcnt(InterpState &S, CodePtr OpPC,
const InterpFrame *Frame,
const Function *Func,
const CallExpr *Call) {
APSInt Val = peekToAPSInt(S.Stk, *S.Ctx.classify(Call->getArg(0)));
pushInteger(S, Val.countLeadingZeros(), Call->getType());
return true;
}

static bool interp__builtin_ia32_tzcnt(InterpState &S, CodePtr OpPC,
const InterpFrame *Frame,
const Function *Func,
const CallExpr *Call) {
APSInt Val = peekToAPSInt(S.Stk, *S.Ctx.classify(Call->getArg(0)));
pushInteger(S, Val.countTrailingZeros(), Call->getType());
return true;
}

static bool interp__builtin_os_log_format_buffer_size(InterpState &S,
CodePtr OpPC,
const InterpFrame *Frame,
Expand Down Expand Up @@ -1773,6 +1812,26 @@ bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const Function *F,
return false;
break;

case clang::X86::BI__builtin_ia32_bzhi_si:
case clang::X86::BI__builtin_ia32_bzhi_di:
if (!interp__builtin_ia32_bzhi(S, OpPC, Frame, F, Call))
return false;
break;

case clang::X86::BI__builtin_ia32_lzcnt_u16:
case clang::X86::BI__builtin_ia32_lzcnt_u32:
case clang::X86::BI__builtin_ia32_lzcnt_u64:
if (!interp__builtin_ia32_lzcnt(S, OpPC, Frame, F, Call))
return false;
break;

case clang::X86::BI__builtin_ia32_tzcnt_u16:
case clang::X86::BI__builtin_ia32_tzcnt_u32:
case clang::X86::BI__builtin_ia32_tzcnt_u64:
if (!interp__builtin_ia32_tzcnt(S, OpPC, Frame, F, Call))
return false;
break;

case Builtin::BI__builtin_os_log_format_buffer_size:
if (!interp__builtin_os_log_format_buffer_size(S, OpPC, Frame, F, Call))
return false;
Expand Down
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