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ID0000785: This issue was created automatically from Mantis Issue 785. Further discussion may take place here.

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Id	Project	Category	View	Due Date	Updated
ID0000785	Frama-C	Kernel	public	2011-04-11	2014-02-12

Reporter	pascal	Assigned To	pascal	Resolution	fixed
Priority	normal	Severity	minor	Reproducibility	have not tried
Platform	-	OS	-	OS Version	-
Product Version	Frama-C GIT, precise the release id	Target Version	-	Fixed in Version	Frama-C Nitrogen-20111001

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 §1 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)