Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!usc!bloom-beacon!bu-cs!encore!xenna.UUCP
From: mccall@xenna.UUCP (Dan McCall,,2653,)
Newsgroups: gnu.gcc.bug
Subject: Possible optimization but in gcc-1.34 and 1.35
Message-ID: <8511@xenna.Encore.COM>
Date: 15 Jun 89 21:21:05 GMT
Sender: news@Encore.COM
Distribution: gnu
Lines: 75

The following simple program produces incorrect code on the Encore Multimax.
Both 1.34 and 1.35 produce the same results.
See below, the file that says 'using -S -O' has the assembler line:

'movd $4227976,_fixed.0'

This "constant 4227976" looks like an internal pointer that somehow made
it into the instruction stream.

When I built both versions of gcc (1.34 and 1.35) I was not able to get the
stage1 and stage2 .o files to compare without differences (using the sh
script which tries ignores differences due to COFF).  Has anyone had other
results on the Multimax?

Has anyone had success with 1.35 or 1.34 on the Multimax?  If so, can
you 1) try the program below and 2) provide any details of how you built gcc
that vary from the instructions in the INSTALL file?

Thanks,

Dan McCall


----------------------------------------------------------------------------
source program bug1.c
----------------------------------------------------------------------------
float    fixed;
main()
{
fixed = 0.0;	
}

-----------------------------------------------------------------------------
using -S
-----------------------------------------------------------------------------
	.file	"bug1.c"
gcc_compiled.:
.text
	.align 4
.LC0:
	.float 0f0.00000000000000000000e+00
	.align 16
.globl _main
_main:
	enter [],0
	movd .LC0,_fixed
.L1:
	exit []
	ret 0
.comm _fixed,4

-----------------------------------------------------------------------------
using -S -O 
-----------------------------------------------------------------------------
	.file	"bug1.c"
gcc_compiled.:
.text
	.align 16
.globl _main
_main:
	enter [],0
	movd $4227976,_fixed
	exit []
	ret 0
.comm _fixed,4

-----------------------------------------------------------------------------
standard error output using  -v
-----------------------------------------------------------------------------

gcc version 1.34
 /usr/local/lib/gcc-cpp -v -undef -D__GNUC__ -Dns32000 -Dn16 -Dns16000 -Dns32332 -Dunix -D__ns32000__ -D__n16__ -D__ns16000__ -D__ns32332__ -D__unix__ -D__OPTIMIZE__ bug1.c /tmp/cc020408.cpp
GNU CPP version 1.34
 /usr/local/lib/gcc-cc1 /tmp/cc020408.cpp -quiet -dumpbase bug1.c -O -version -o bug1.s
GNU C version 1.34 (32000, Encore syntax) compiled by GNU C version 1.34.