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//===- AMDGPUMCExpr.h - AMDGPU specific MC expression classes ---*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_AMDGPU_MCTARGETDESC_AMDGPUMCEXPR_H
#define LLVM_LIB_TARGET_AMDGPU_MCTARGETDESC_AMDGPUMCEXPR_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/MC/MCExpr.h"
namespace llvm {
class Function;
class GCNSubtarget;
/// AMDGPU target specific MCExpr operations.
///
/// Takes in a minimum of 1 argument to be used with an operation. The supported
/// operations are:
/// - (bitwise) or
/// - max
///
/// \note If the 'or'/'max' operations are provided only a single argument, the
/// operation will act as a no-op and simply resolve as the provided argument.
///
class AMDGPUMCExpr : public MCTargetExpr {
public:
enum VariantKind {
AGVK_None,
AGVK_Or,
AGVK_Max,
AGVK_ExtraSGPRs,
AGVK_TotalNumVGPRs,
AGVK_AlignTo,
AGVK_Occupancy
};
private:
VariantKind Kind;
MCContext &Ctx;
const MCExpr **RawArgs;
ArrayRef<const MCExpr *> Args;
AMDGPUMCExpr(VariantKind Kind, ArrayRef<const MCExpr *> Args, MCContext &Ctx);
~AMDGPUMCExpr();
bool evaluateExtraSGPRs(MCValue &Res, const MCAssembler *Asm,
const MCFixup *Fixup) const;
bool evaluateTotalNumVGPR(MCValue &Res, const MCAssembler *Asm,
const MCFixup *Fixup) const;
bool evaluateAlignTo(MCValue &Res, const MCAssembler *Asm,
const MCFixup *Fixup) const;
bool evaluateOccupancy(MCValue &Res, const MCAssembler *Asm,
const MCFixup *Fixup) const;
public:
static const AMDGPUMCExpr *
create(VariantKind Kind, ArrayRef<const MCExpr *> Args, MCContext &Ctx);
static const AMDGPUMCExpr *createOr(ArrayRef<const MCExpr *> Args,
MCContext &Ctx) {
return create(VariantKind::AGVK_Or, Args, Ctx);
}
static const AMDGPUMCExpr *createMax(ArrayRef<const MCExpr *> Args,
MCContext &Ctx) {
return create(VariantKind::AGVK_Max, Args, Ctx);
}
static const AMDGPUMCExpr *createExtraSGPRs(const MCExpr *VCCUsed,
const MCExpr *FlatScrUsed,
bool XNACKUsed, MCContext &Ctx);
static const AMDGPUMCExpr *createTotalNumVGPR(const MCExpr *NumAGPR,
const MCExpr *NumVGPR,
MCContext &Ctx);
static const AMDGPUMCExpr *
createAlignTo(const MCExpr *Value, const MCExpr *Align, MCContext &Ctx) {
return create(VariantKind::AGVK_AlignTo, {Value, Align}, Ctx);
}
static const AMDGPUMCExpr *createOccupancy(unsigned InitOcc,
const MCExpr *NumSGPRs,
const MCExpr *NumVGPRs,
const GCNSubtarget &STM,
MCContext &Ctx);
ArrayRef<const MCExpr *> getArgs() const { return Args; }
VariantKind getKind() const { return Kind; }
const MCExpr *getSubExpr(size_t Index) const;
void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override;
bool evaluateAsRelocatableImpl(MCValue &Res, const MCAssembler *Asm,
const MCFixup *Fixup) const override;
bool isSymbolUsedInExpression(const MCSymbol *Sym) const override;
void visitUsedExpr(MCStreamer &Streamer) const override;
MCFragment *findAssociatedFragment() const override;
void fixELFSymbolsInTLSFixups(MCAssembler &) const override{};
static bool classof(const MCExpr *E) {
return E->getKind() == MCExpr::Target;
}
};
namespace AMDGPU {
// Tries to leverage KnownBits for MCExprs to reduce and limit any composed
// MCExprs printing. E.g., for an expression such as
// ((unevaluatable_sym | 1) & 1) won't evaluate due to unevaluatable_sym and
// would verbosely print the full expression; however, KnownBits should deduce
// the value to be 1. Particularly useful for AMDGPU metadata MCExprs.
void printAMDGPUMCExpr(const MCExpr *Expr, raw_ostream &OS,
const MCAsmInfo *MAI);
const MCExpr *foldAMDGPUMCExpr(const MCExpr *Expr, MCContext &Ctx);
} // end namespace AMDGPU
} // end namespace llvm
#endif // LLVM_LIB_TARGET_AMDGPU_MCTARGETDESC_AMDGPUMCEXPR_H
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