diff options
Diffstat (limited to 'llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp | 30 |
1 files changed, 25 insertions, 5 deletions
diff --git a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp index bff22844992..9ddf20bc3c9 100644 --- a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp +++ b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp @@ -1763,10 +1763,6 @@ const MCExpr *AsmPrinter::lowerConstant(const Constant *CV) { llvm_unreachable("Unknown constant value to lower!"); } - if (const MCExpr *RelocExpr - = getObjFileLowering().getExecutableRelativeSymbol(CE, *Mang, TM)) - return RelocExpr; - switch (CE->getOpcode()) { default: // If the code isn't optimized, there may be outstanding folding @@ -1842,10 +1838,34 @@ const MCExpr *AsmPrinter::lowerConstant(const Constant *CV) { return MCBinaryExpr::createAnd(OpExpr, MaskExpr, Ctx); } + case Instruction::Sub: { + GlobalValue *LHSGV; + APInt LHSOffset; + if (IsConstantOffsetFromGlobal(CE->getOperand(0), LHSGV, LHSOffset, + getDataLayout())) { + GlobalValue *RHSGV; + APInt RHSOffset; + if (IsConstantOffsetFromGlobal(CE->getOperand(1), RHSGV, RHSOffset, + getDataLayout())) { + const MCExpr *RelocExpr = getObjFileLowering().lowerRelativeReference( + LHSGV, RHSGV, *Mang, TM); + if (!RelocExpr) + RelocExpr = MCBinaryExpr::createSub( + MCSymbolRefExpr::create(getSymbol(LHSGV), Ctx), + MCSymbolRefExpr::create(getSymbol(RHSGV), Ctx), Ctx); + int64_t Addend = (LHSOffset - RHSOffset).getSExtValue(); + if (Addend != 0) + RelocExpr = MCBinaryExpr::createAdd( + RelocExpr, MCConstantExpr::create(Addend, Ctx), Ctx); + return RelocExpr; + } + } + } + // else fallthrough + // The MC library also has a right-shift operator, but it isn't consistently // signed or unsigned between different targets. case Instruction::Add: - case Instruction::Sub: case Instruction::Mul: case Instruction::SDiv: case Instruction::SRem: |
