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Avoid POP TP,TP.

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In the DEC Processor Reference Manual, this is documented as "result is
indeterminate", and there's a note in the ITS KL microcode implying that
the default KL behaviour was different from the KA.

Muddle 54 uses this to drop a temporary stack frame from TP in a few
places. If it doesn't work properly, one obvious result is that READing
bracketed expressions leaves garbage on the TP stack -- e.g. typing
<QUIT> at the interpreter will print a FIX instead.

Muddle 56 replaces this with MOVE TP,(TP), so do that as a new patch.
This commit is contained in:
Adam Sampson
2020-09-11 00:49:07 +01:00
committed by Adam Sampson
parent a209c97ec1
commit 2b66dfce6e
1 changed files with 8 additions and 0 deletions
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8
src/muds54/mud54.init
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@@ -350,6 +350,14 @@ VUP3+13/ JUMPA C,702207
TBLSET/ JFCL
TBLSET+3/ PUSH TP,$TWORD
: Modern patches 
: POP TP,TP behaves differently on non-KA 
CBYST+4/ MOVE TP,(TP)
GLOSEG-3/ MOVE TP,(TP)
FINID/ MOVE TP,(TP)
CARIT1+10/ MOVE TP,(TP)
:pdump mudsav;ts mud54
g