b839632bf4
Prepare for removing PPCMCExpr. Adopt the newer naming convention with AMDGPU/WebAssembly/VE/M68k.
94 lines
2.6 KiB
C++
94 lines
2.6 KiB
C++
//===-- PPCMCExpr.cpp - PPC specific MC expression classes ----------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "PPCMCExpr.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCObjectStreamer.h"
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using namespace llvm;
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#define DEBUG_TYPE "ppcmcexpr"
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const PPCMCExpr *PPCMCExpr::create(Specifier S, const MCExpr *Expr,
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MCContext &Ctx) {
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return new (Ctx) PPCMCExpr(S, Expr);
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}
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const PPCMCExpr *PPCMCExpr::create(const MCExpr *Expr, Specifier S,
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MCContext &Ctx) {
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return new (Ctx) PPCMCExpr(S, Expr);
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}
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void PPCMCExpr::printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const {
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getSubExpr()->print(OS, MAI);
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OS << '@' << MAI->getSpecifierName(specifier);
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}
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bool
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PPCMCExpr::evaluateAsConstant(int64_t &Res) const {
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MCValue Value;
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if (!getSubExpr()->evaluateAsRelocatable(Value, nullptr))
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return false;
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if (!Value.isAbsolute())
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return false;
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auto Tmp = evaluateAsInt64(Value.getConstant());
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if (!Tmp)
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return false;
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Res = *Tmp;
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return true;
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}
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std::optional<int64_t> PPCMCExpr::evaluateAsInt64(int64_t Value) const {
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switch (specifier) {
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case PPC::S_LO:
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return Value & 0xffff;
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case PPC::S_HI:
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return (Value >> 16) & 0xffff;
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case PPC::S_HA:
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return ((Value + 0x8000) >> 16) & 0xffff;
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case PPC::S_HIGH:
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return (Value >> 16) & 0xffff;
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case PPC::S_HIGHA:
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return ((Value + 0x8000) >> 16) & 0xffff;
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case PPC::S_HIGHER:
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return (Value >> 32) & 0xffff;
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case PPC::S_HIGHERA:
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return ((Value + 0x8000) >> 32) & 0xffff;
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case PPC::S_HIGHEST:
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return (Value >> 48) & 0xffff;
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case PPC::S_HIGHESTA:
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return ((Value + 0x8000) >> 48) & 0xffff;
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default:
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return {};
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}
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}
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bool PPCMCExpr::evaluateAsRelocatableImpl(MCValue &Res,
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const MCAssembler *Asm) const {
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if (!Asm)
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return false;
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if (!getSubExpr()->evaluateAsRelocatable(Res, Asm))
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return false;
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// The signedness of the result is dependent on the instruction operand. E.g.
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// in addis 3,3,65535@l, 65535@l is signed. In the absence of information at
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// parse time (!Asm), disable the folding.
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std::optional<int64_t> MaybeInt = evaluateAsInt64(Res.getConstant());
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if (Res.isAbsolute() && MaybeInt) {
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Res = MCValue::get(*MaybeInt);
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} else {
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Res.setSpecifier(specifier);
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}
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return true;
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}
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