Re: port-alpha/48782: # top [1] Floating point exception (core dumped) top

["Naruaki.Etomi" <nullnilaki%gmail.com@localhost>]

The following reply was made to PR port-alpha/48782; it has been noted by GNATS.

From: "Naruaki.Etomi" <nullnilaki%gmail.com@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: martin%duskware.de@localhost
Subject: Re: port-alpha/48782: # top [1] Floating point exception (core
 dumped) top
Date: Tue, 6 May 2014 13:29:47 +0900

 > I think that this case is -mieee-with-inexact option bug.
 Sorry, I guess I was mistaken.
 
 I was installed gcc-4.2.3 for Tru64 UNIX.
 Please see.(thanks Tobias!)
 http://mail-index.netbsd.org/pkgsrc-users/2008/02/19/msg000417.html
 
 ---------------
 
 ds15> more test.c
  #include <stdio.h>
 
  int main (int argc, char *argv[])
  {
    double a, b, c;
 
    a = 1.;
    b = 3.;
    c = a/b;
 
    fprintf (stderr, "%g / %g = %g\n", a, b, c);
  }
 
 ds15> /usr/local/gcc4/bin/gcc -v
 Using built-in specs.
 Target: alpha-dec-osf5.1b
 Configured with: ../gcc-4.2.3/configure --prefix=/usr/local/gcc4
 --enable-languages=c,c++ --enable-threads=posix --disable-nls
 --host=alpha-dec-osf5.1b --without-gnu-ld --with-ld=/usr/ccs/bin/ld
 --without-gnu-as --with-as=/usr/bin/as --disable-libssp
 Thread model: posix
 gcc version 4.2.3
 ds15> uname -a
 OSF1 ds15 V5.1 2650 alpha
 
 ds15> /usr/local/gcc4/bin/gcc -mieee-with-inexact test.c
 ds15> ./a.out
 1 / 3 = 0.333333
 
 ds15> more test.s
     .file    1 "test.c"
     .verstamp 3 11
     .set noreorder
     .set volatile
     .set noat
     .arch ev4
     .rdata
 $LC2:
     .ascii "%g / %g = %g\12\0"
     .align 3
 $LC0:
     .long    0
     .long    1072693248
     .align 3
 $LC1:
     .long    0
     .long    1074266112
     .text
     .align 2
     .globl main
     .ent main
 main:
     .eflag 48
     .frame $15,64,$26,0
     .mask 0x4008000,-64
     ldgp $29,0($27)
 $main..ng:
     lda $30,-64($30)
     stq $26,0($30)
     stq $15,8($30)
     bis $31,$30,$15
     .prologue 1
     bis $31,$16,$1
     stq $17,56($15)
     stl $1,48($15)
     lda $1,$LC0
     ldt $f10,0($1)
     stt $f10,32($15)
     lda $1,$LC1
     ldt $f10,0($1)
     stt $f10,24($15)
     ldt $f11,32($15)
     ldt $f10,24($15)
     divtsui $f11,$f10,$f12
     trapb
     cpys $f12,$f12,$f10
     stt $f10,16($15)
     lda $1,_iob
     lda $1,112($1)
     bis $31,$1,$16
     lda $17,$LC2
     ldt $f18,32($15)
     ldt $f19,24($15)
     ldt $f20,16($15)
     jsr $26,fprintf
     ldgp $29,0($26)
     bis $31,$15,$30
     ldq $26,0($30)
     ldq $15,8($30)
     lda $30,64($30)
     ret $31,($26),1
     .end main
 
 ---------------
 
 It seems to me that gcc is correct.
 Maybe alpha/fp_complete.c is worng.
 
 ---
 That's very nice of you!
 Naruaki Etomi / nullnilaki%gmail.com@localhost