From 853bdb6741624232a952ec3d3d3021859fb2d14d Mon Sep 17 00:00:00 2001
From: Neil Webber <neil@webber.com>
Date: Wed, 20 Sep 2023 09:10:41 -0500
Subject: [PATCH] smaller loco range in fwdword
---
pdpasmhelper.py | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/pdpasmhelper.py b/pdpasmhelper.py
index 25c5969..479aade 100644
--- a/pdpasmhelper.py
+++ b/pdpasmhelper.py
@@ -329,11 +329,10 @@ class InstructionBlock(PDP11InstructionAssembler, AbstractContextManager):
def _fwdword(fref):
block = fref.block
- # see if we can recover loco this amazing hack way!
- for loco in (0, 1, 2, -1, -2):
+ # the location to be patched is in one of three places, look for it:
+ for loco in (0, 1, 2):
if block._instblock[fref.loc + loco] == fref:
break
-
fwdoffs = block.getlabel(fref.name) - (2*fref.loc)
block._instblock[fref.loc + loco] = fwdoffs
@@ -429,6 +428,8 @@ class InstructionBlock(PDP11InstructionAssembler, AbstractContextManager):
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):
fwdoffs = self.getlabel(fref.name) - (2 * (fref.loc + 1))
block = fref.block