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smaller loco range in fwdword

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This commit is contained in:
Neil Webber 2023-09-20 09:10:41 -05:00
parent cad7658511
commit 853bdb6741
1 changed files with 4 additions and 3 deletions
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7
pdpasmhelper.py
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@ -329,11 +329,10 @@ class InstructionBlock(PDP11InstructionAssembler, AbstractContextManager):
def _fwdword(fref): def _fwdword(fref):
block = fref.block block = fref.block
# see if we can recover loco this amazing hack way! # the location to be patched is in one of three places, look for it:
for loco in (0, 1, 2, -1, -2): for loco in (0, 1, 2):
if block._instblock[fref.loc + loco] == fref: if block._instblock[fref.loc + loco] == fref:
break break
fwdoffs = block.getlabel(fref.name) - (2*fref.loc) fwdoffs = block.getlabel(fref.name) - (2*fref.loc)
block._instblock[fref.loc + loco] = fwdoffs block._instblock[fref.loc + loco] = fwdoffs
@ -429,6 +428,8 @@ class InstructionBlock(PDP11InstructionAssembler, AbstractContextManager):
return self._neg16(x) return self._neg16(x)
# can't use the standard fwdword patcher because the offset
# needs to be divided by 2 and checked if fits within 8 bits
def _branchpatch(self, fref): def _branchpatch(self, fref):
fwdoffs = self.getlabel(fref.name) - (2 * (fref.loc + 1)) fwdoffs = self.getlabel(fref.name) - (2 * (fref.loc + 1))
block = fref.block block = fref.block