Bug 52554

Summary: g77 -O2 -c serf.f causes internal compiler error
Product: [Retired] Red Hat Linux Reporter: Jay W Parker <jay.w.parker>
Component: gccAssignee: Jakub Jelinek <jakub>
Status: CLOSED CURRENTRELEASE QA Contact: David Lawrence <dkl>
Severity: medium Docs Contact:
Priority: medium    
Version: 7.1   
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Hardware: i686   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2002-12-15 17:39:32 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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very old fortran file: single prec error fcn from math77 none

Description Jay W Parker 2001-08-24 23:54:52 UTC 
From Bugzilla Helper:
User-Agent: Mozilla/4.7 (Macintosh; I; PPC)

Description of problem:
Compilation of one particular routine by g77 with -O2 causes internal error report, no output.
-O1 or less works, -O3 fails. This same compilation line worked under RH6.2. 
You can have the source (see attachment).



Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1.  g77 -c -O2 serf.f
2.
3.
	

Actual Results:  > g77 -c -O2 serf.f
serf.f: In function `serf':
serf.f:453: Internal compiler error in convert_regs_1, at reg-stack.c:2607

Expected Results:  should have produced serf.o

Additional info:

Name        : gcc-g77                      Relocations: (not relocateable)
Version     : 2.96                              Vendor: Red Hat, Inc.
Release     : 85                            Build Date: Wed 09 May 2001 11:04:50 AM PDT
Comment 1 Jay W Parker 2001-08-25 00:02:00 UTC 
Created attachment 29454 [details]
very old fortran file: single prec error fcn from math77
Comment 2 Jakub Jelinek 2001-08-28 12:09:18 UTC 
Seems gcse is messing up the flow graph. The bug is present in g77 3.0.1 too,
bug apparently at least not reproduceable in g77 3.1 CVS.
Simple workaround -fno-gcse. Debugging...
Comment 3 Alan Cox 2002-12-15 17:39:32 UTC 
Ok in 3.2