MC: Allow getMaxInstLength to depend on the subtarget
Keep it optional in cases this is ever needed in some global
context. Currently it's only used for getting an upper bound inline
asm code size.
For AMDGPU, gfx10 increases the maximum instruction size to
20-bytes. This avoids penalizing older subtargets when estimating code
size, and making some annoying branch relaxation test adjustments.
llvm-svn: 361405
diff --git a/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.h b/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.h
index 63cadd1..3467d33 100644
--- a/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.h
+++ b/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.h
@@ -41,15 +41,14 @@
private:
std::unique_ptr<MCInstrInfo const> const MCII;
const MCRegisterInfo &MRI;
+ const unsigned TargetMaxInstBytes;
mutable ArrayRef<uint8_t> Bytes;
mutable uint32_t Literal;
mutable bool HasLiteral;
public:
AMDGPUDisassembler(const MCSubtargetInfo &STI, MCContext &Ctx,
- MCInstrInfo const *MCII) :
- MCDisassembler(STI, Ctx), MCII(MCII), MRI(*Ctx.getRegisterInfo()) {}
-
+ MCInstrInfo const *MCII);
~AMDGPUDisassembler() override = default;
DecodeStatus getInstruction(MCInst &MI, uint64_t &Size,