>Number:         2680
>Category:       bin
>Synopsis:       gcc optimizer bug
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    bin-bug-people (Utility Bug People)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Aug  9 11:35:03 1996
>Last-Modified:
>Originator:     Peter Seebach
>Organization:
Peter Seebach - seebs@solon.com - Copyright 1996 Peter Seebach.
C/Unix wizard -- C/Unix questions? Send mail for help.  No, really!
Unsolicited email is not welcome, and will be billed for at consulting rates.
The *other* C FAQ - http://www.solon.com/~seebs/c/c-iaq.html
>Release:        1.2_BETA
>Environment:
System: NetBSD taniemarie 1.2_BETA NetBSD 1.2_BETA (SEEBS) #3: Wed Jul 24 00:10:48 CDT 1996 seebs@taniemarie:/usr/src/sys/arch/amiga/compile/SEEBS amiga


>Description:
	gcc has an optimizer bug, involving static and readonly attributes.
>How-To-Repeat:
	Read the X-Mosaic-Alpha list, where someone described it.  Note that
	the comment in the source contradicts the current source.

>Fix:
	In expr.c, expand_expr(), around line 4582, change
	RTX_UNCHANGING_P (temp) = TREE_READONLY (exp) | TREE_STATIC (exp);
	to
	RTX_UNCHANGING_P (temp) = TREE_READONLY (exp) & TREE_STATIC (exp);
	...

>Audit-Trail:
>Unformatted: