Package: libc0.1
Version: 2.19-11
X-Debbugs-CC: debian-bsd@lists.debian.org
very similar to bug 761175 about the x87 control word.
but the same issue affects the sse control word mxcsr.
It was not fixed in -11 that fixed the x87 fpu.
(sid_kfreebsd-amd64-dchroot)jtaylor@falla:~$ cat test2.c
#include <pthread.h>
#include <xmmintrin.h>
#include <stdio.h>
#include <fpu_control.h>
#include <fenv.h>
void *thread_fun(void *x_void_ptr)
{
fenv_t env;
fegetenv(&env);
printf("thread mxcsr %x\n", env.__mxcsr);
return NULL;
}
int main()
{
pthread_t thread;
fenv_t env;
fegetenv(&env);
printf("main mxcsr pre %x\n", env.__mxcsr);
_MM_SET_FLUSH_ZERO_MODE (_MM_FLUSH_ZERO_ON);
fegetenv(&env);
printf("main mxcsr %x\n", env.__mxcsr);
if(pthread_create(&thread, NULL, thread_fun, NULL)) {
fprintf(stderr, "Error creating thread\n");
return 1;
}
if(pthread_join(thread, NULL)) {
fprintf(stderr, "Error joining thread\n");
return 2;
}
return 0;
}
$ ./a.out
main mxcsr pre 1f80
main mxcsr 9f80
thread mxcsr 1f80
$ apt-cache policy libc0.1
libc0.1:
Installed: 2.19-11
Candidate: 2.19-11
Version table:
*** 2.19-11 0
on linux the control word is inherited as per SysV abi section 3.4.2.
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