Thread View: comp.bugs.sys5
1 messages
1 total messages
Started by da
Tue, 07 Apr 1987 18:58
MC68020 assembler bug
Author: da
Date: Tue, 07 Apr 1987 18:58
Date: Tue, 07 Apr 1987 18:58
24 lines
1439 bytes
1439 bytes
Index: as Motorola 68020 SYSV
Description:
System V, R2 & R3 , Motorola 68020 assembler
Shortsdi() in sgs/as/common/expand1.c or sgs/as/m32/expand1.c
(wherever you find expand1.c!)
will return a random value once enough
span-dependent-instructions are seen. The message
Table overflow: some optimizations lost (SDIs)
appears when the limit is reached. Improper assembly is then
*possible*.
Repeat-By:
(Too hard to do without modifying assembler to force bug!)
Temporarily modify expand1.c to return S_SDI always.
Bsr to extern is assembled wrong as 16 bit offset.
The assembler only complains if the target is local.
Fix:
Initialize the local variable sditype to L_SDI.
_________________________________________________________________
David Anderson ucbvax!mtxinu!sun!hplabs!fortune!da
Fortune Systems, Belmont California (415)598-4372 hpda!fortune!da
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