Re: [Tinycc-devel] ARM (RPi) compiler bug

[Christian Jullien]

You can add 56 test for this case:

::::::::::::::
56_dbl_sizet_cst_mul.c
::::::::::::::
#include <stdio.h>
static int debug, nfailed = 0;

static void check (const char* s)
{
  double dbl = 44.361420;
  size_t len = 2;
  double res = dbl * 32 * len; /* 2839.130880 */

  if (!(res > 2839.13 && res < 2839.14)) {
    ++nfailed;
    if (debug)
     printf ("%s %f V.S. %f\n", s, res, 2839.130880);
  }
}

int main (int argc, char **argv)
{
  debug = argc > 1;
  check("double * size_r * cst");
  printf ("%d test(s) failed\n", nfailed);
  return nfailed != 0;
}
::::::::::::::
56_dbl_sizet_cst_mul.expect
::::::::::::::
0 test(s) failed

-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of
Christian Jullien
Sent: samedi 2 février 2013 12:26
To: address@hidden
Subject: [Tinycc-devel] ARM (RPi) compiler bug

Hi all,

Trying to port my (extremely portable Bignum lib:
http://sourceforge.net/projects/bigz/)

This code snippet, isolates the error I get:

#include <stdio.h>
void
main(void)
{
        double dbl = 44.361420;
        size_t len = 2;
        printf("1) =>%f %ld\n", dbl, len);
        printf("2) =>%f\n", dbl * 64);
        printf("3) =>%f\n", dbl * 32 * len); // BUG here!!!
}


$ tcc -o foo foo.c && ./foo
1) =>44.361420 2
2) =>2839.130880
3) =>64384184694.211205

My conf:
git clone -b mob git://repo.or.cz/tinycc.git cd tinycc git pull ./configure
--with-libgcc make make test // no error

$ uname -a
Linux sims 3.6.11+ #366 PREEMPT Wed Jan 30 12:59:10 GMT 2013 armv6l
GNU/Linux

$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/arm-linux-gnueabihf/4.7/lto-wrapper
Target: arm-linux-gnueabihf
Configured with: ../src/configure -v --with-pkgversion='Debian 4.7.2-5+rpi1'
--with-bugurl=file:///usr/share/doc/gcc-4.7/README.Bugs
--enable-languages=c,c++,go,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.7 --enable-shared --enable-linker-build-id
--with-system-zlib --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.7
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--enable-gnu-unique-object --disable-libitm --enable-plugin --enable-objc-gc
--disable-sjlj-exceptions --with-arch=armv6 --with-fpu=vfp --with-float=hard
--enable-checking=release --build=arm-linux-gnueabihf
--host=arm-linux-gnueabihf --target=arm-linux-gnueabihf Thread model: posix
gcc version 4.7.2 (Debian 4.7.2-5+rpi1)


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