c/3092: gcc fails to compile crtstuff.c for linux-m68k

c/3092: gcc fails to compile crtstuff.c for linux-m68k

[Roman Zippel]

>Number:         3092
>Category:       c
>Synopsis:       gcc fails to compile crtstuff.c for linux-m68k
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          ice-on-legal-code
>Submitter-Id:   net
>Arrival-Date:   Fri Jun 08 15:36:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Roman Zippel
>Release:        3.0 20010606 (prerelease)
>Organization:
>Environment:
System: Linux sodom 2.2.10 #4 Sun Aug 1 14:25:38 CEST 1999 m68k unknown
Architecture: m68k

	
host: m68k-unknown-linux-gnu
build: m68k-unknown-linux-gnu
target: m68k-unknown-linux-gnu
configured with: ../gcc-3.0/configure --verbose --cache-file=../config.cache --prefix=/usr/local/egcs --enable-languages=c,c++
>Description:
simplify_rtx() returns either const0_rtx or const_true_rtx, but
expected_value_to_br_prob() is testing for const1_rtx and const0_rtx,
which fails for linux-m68k.
The same problem is already reported in PR 1795, but fixed with
patch below. Note that this depends on the fix in bootstrap/3090.
>How-To-Repeat:
Configure for linux-m68k and (cross) compile.
>Fix:
Index: gcc/predict.c
===================================================================
RCS file: /cvs/gcc/egcs/gcc/predict.c,v
retrieving revision 1.15.4.1
diff -u -r1.15.4.1 predict.c
--- predict.c	2001/05/12 20:32:37	1.15.4.1
+++ predict.c	2001/06/08 19:57:51
@@ -295,7 +295,7 @@
       cond = simplify_rtx (cond);
 
       /* Turn the condition into a scaled branch probability.  */
-      if (cond == const1_rtx)
+      if (cond == const_true_rtx)
 	cond = GEN_INT (PROB_VERY_LIKELY);
       else if (cond == const0_rtx)
 	cond = GEN_INT (PROB_VERY_UNLIKELY);
>Release-Note:
>Audit-Trail:
>Unformatted: