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| ID | Project | Category | View Status | Date Submitted | Last Update |
| 0000785 | Frama-C | Kernel | public | 2011-04-11 16:17 | 2014-02-12 16:59 |
|
| Reporter | pascal | |
| Assigned To | pascal | |
| Priority | normal | Severity | minor | Reproducibility | have not tried |
| Status | closed | Resolution | fixed | |
| Platform | | OS | | OS Version | |
| Product Version | Frama-C GIT, precise the release id | |
| Target Version | | Fixed in Version | Frama-C Nitrogen-20111001 | |
|
| Summary | 0000785: 12799, doubtful choice of promotion x86_64 mode (csmith) |
| Description | int x;
long x2;
unsigned long x9[6][2];
#if 0
#define d(n, v) Frama_C_show_each##n(v);
#else
#define d(n, v)
#endif
main(){
x2 = 2793414595;
for (int i = 0; i < 6; i++)
{
for (int j = 0; j < 2; j++)
x9[i][j] = 1U;
}
d(102, (0x090E7AF82577C8A6LL | x9[1][0]) )
d(103, (~(x2 || x9[1][0])) )
d(95, ((0x090E7AF82577C8A6LL | x9[0][1]) <= (~(x2 || x9[0][1]))))
x = ((0x090E7AF82577C8A6LL | x9[0][1]) <= (~(x2 || x9[0][1])));
return x;
}
~/ppc/bin/toplevel.opt -val -machdep x86_64 r.c -slevel 5000
...
[value] Values for function main:
x ? {0; }
BUT:
gcc -std=c99 r.c ; ./a.out ; echo $?
1
NOTE THAT:
~/ppc/bin/toplevel.opt -print -machdep x86_64 r.c [kernel] preprocessing with "gcc -C -E -I. r.c"
...
x = (0x090E7AF82577C8A6LL | (long long )x9[0][1]) <= (long long )(~ tmp);
}
return (x);
}
gcc is the computation server's, supposed to match x86_64.
x9[0][1] is an unsigned long. The promotion of the arguments of | seems to be wrong in Frama-C's front-end according to 6.3.1.8 (p 45), where the very last case of ยง1 seems to apply.
|
| Additional Information | In addition to the computation server's GCC (version 4.4.3 (Ubuntu 4.4.3-4ubuntu5)), this one also predicts the result 1 for x when compiling with -m64:
gcc -m64 -v
Using built-in specs.
Target: powerpc-apple-darwin9
Configured with: /var/tmp/gcc/gcc-5493~1/src/configure --disable-checking -enable-werror --prefix=/usr --mandir=/share/man --enable-languages=c,objc,c++,obj-c++ --program-transform-name=/^[cg][^.-]*$/s/$/-4.0/ --with-gxx-include-dir=/include/c++/4.0.0 --with-slibdir=/usr/lib --build=i686-apple-darwin9 --program-prefix= --host=powerpc-apple-darwin9 --target=powerpc-apple-darwin9
Thread model: posix
gcc version 4.0.1 (Apple Inc. build 5493)
|
| Tags | No tags attached. |
|
| Attached Files | |
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