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Date: 29 Jan 90 15:04:33 GMT
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Subject: Bug in gcc v1.36 on Convex

Gcc sometimes gets the wrong word when truncating "long long"s to
"long".  The following code demonstrates this.  This is GCC version
1.36 running on a Convex-c1 running Convex UNIX version 7.0.1.23.

Thomas Quinn
MAIL:  Dept. of Theoretical Physics, 1 Keble Road, Oxford, OX1 3RH, UK
EMAIL: trq@astrophysics.oxford.ac.uk
PHONE: 44-865-273956

The compile:
gcc -v -g -O -S dbxread.c
gcc version 1.36
 /mnt/trquinn/lib/gcc-cpp -v -undef -D__GNUC__ -Dconvex -Dparsec -Dunix
 -D__convex__ -D__parsec__ -D__unix__ -D__OPTIMIZE__ dbxread.c
 /usr/tmp/cc000404.cpp
GNU CPP version 1.36
 /mnt/trquinn/lib/gcc-cc1 /usr/tmp/cc000404.cpp -quiet -dumpbase dbxread.c -g -O
 -version -o dbxread.s
GNU C version 1.36 (convex) compiled by GNU C version 1.36.
default target switches: -mc1

The bad assembly:
	.stabd 68,0,20
	pshea 0
	pshea @-8(fp)	!! The convex is WORD_BIG_ENDIAN; this should
			!! be @-4(fp)
	pshea @-24(fp)
	mov sp,ap
	calls _lseek

The code:

  struct filehdr $
	unsigned long	   h_magic;
	unsigned long	   h_version;
	unsigned long long h_strptr;
  ;
void
symbol_file_command (name, from_tty)
     char *name;
     int from_tty;
$
  register int desc;
  struct filehdr  filehdr;
  register int val;
  char *absolute_name;

  desc = openp (getenv ("PATH"), 1, name, 0 , 0, &absolute_name);
  if (myread (desc, &filehdr, sizeof filehdr) < 0)
    perror_with_name ( name);

  val = lseek (desc,  ((long) filehdr.h_strptr) , 0);