Add branch relaxation pass (shamelessly stolen from PPC).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93554 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/MSP430/MSP430InstrInfo.cpp b/lib/Target/MSP430/MSP430InstrInfo.cpp
index 2ae6759..9dc69e0d 100644
--- a/lib/Target/MSP430/MSP430InstrInfo.cpp
+++ b/lib/Target/MSP430/MSP430InstrInfo.cpp
@@ -344,3 +344,45 @@
}
return Count;
}
+
+/// GetInstSize - Return the number of bytes of code the specified
+/// instruction may be. This returns the maximum number of bytes.
+///
+unsigned MSP430InstrInfo::GetInstSizeInBytes(const MachineInstr *MI) const {
+ const TargetInstrDesc &Desc = MI->getDesc();
+
+ switch (Desc.TSFlags & MSP430II::SizeMask) {
+ default:
+ switch (Desc.getOpcode()) {
+ default:
+ assert(0 && "Unknown instruction size!");
+ case TargetInstrInfo::DBG_LABEL:
+ case TargetInstrInfo::EH_LABEL:
+ case TargetInstrInfo::IMPLICIT_DEF:
+ case TargetInstrInfo::KILL:
+ return 0;
+ case TargetInstrInfo::INLINEASM: {
+ const MachineFunction *MF = MI->getParent()->getParent();
+ const TargetInstrInfo &TII = *MF->getTarget().getInstrInfo();
+ return TII.getInlineAsmLength(MI->getOperand(0).getSymbolName(),
+ *MF->getTarget().getMCAsmInfo());
+ }
+ }
+ case MSP430II::SizeSpecial:
+ switch (MI->getOpcode()) {
+ default:
+ assert(0 && "Unknown instruction size!");
+ case MSP430::SAR8r1c:
+ case MSP430::SAR16r1c:
+ return 4;
+ }
+ case MSP430II::Size2Bytes:
+ return 2;
+ case MSP430II::Size4Bytes:
+ return 4;
+ case MSP430II::Size6Bytes:
+ return 6;
+ }
+
+ return 6;
+}