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[clang][bytecode] Implement ia32_bextr builitns #110513

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Sep 30, 2024
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[clang][bytecode] Implement ia32_bextr builitns #110513

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36 changes: 36 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 @@ -14,6 +14,7 @@
#include "clang/AST/OSLog.h"
#include "clang/AST/RecordLayout.h"
#include "clang/Basic/Builtins.h"
#include "clang/Basic/TargetBuiltins.h"
#include "clang/Basic/TargetInfo.h"
#include "llvm/Support/SipHash.h"

Expand Down Expand Up @@ -1152,6 +1153,33 @@ static bool interp__builtin_is_aligned_up_down(InterpState &S, CodePtr OpPC,
return false;
}

static bool interp__builtin_ia32_bextr(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 Index = peekToAPSInt(S.Stk, IndexT);

unsigned BitWidth = Val.getBitWidth();
uint64_t Shift = Index.extractBitsAsZExtValue(8, 0);
uint64_t Length = Index.extractBitsAsZExtValue(8, 8);
Length = Length > BitWidth ? BitWidth : Length;

// Handle out of bounds cases.
if (Length == 0 || Shift >= BitWidth) {
pushInteger(S, 0, Call->getType());
return true;
}

uint64_t Result = Val.getZExtValue() >> Shift;
Result &= llvm::maskTrailingOnes<uint64_t>(Length);
pushInteger(S, Result, Call->getType());
return true;
}

static bool interp__builtin_os_log_format_buffer_size(InterpState &S,
CodePtr OpPC,
const InterpFrame *Frame,
Expand Down Expand Up @@ -1737,6 +1765,14 @@ bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const Function *F,
return false;
break;

case clang::X86::BI__builtin_ia32_bextr_u32:
case clang::X86::BI__builtin_ia32_bextr_u64:
case clang::X86::BI__builtin_ia32_bextri_u32:
case clang::X86::BI__builtin_ia32_bextri_u64:
if (!interp__builtin_ia32_bextr(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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