Attachment 1019306 Details for Bug 1127544 – diagnostic script

diagnostic script

y.py (text/plain), 1.57 KB, created by Petr Viktorin on 2015-04-27 12:14:39 UTC

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Creator: Petr Viktorin

Created: 2015-04-27 12:14:39 UTC

Size: 1.57 KB

patch

obsolete

># NOTE: Specific to the x84_64 architecture
>
>from __future__ import print_function
>from cffi import FFI
>ffi = FFI()
>ffi.cdef("""
>    // From /usr/include/bits/fenv.h
>    typedef struct {
>        unsigned short int __control_word;
>        unsigned short int __glibc_reserved1;
>        unsigned short int __status_word;
>        unsigned short int __glibc_reserved2;
>        unsigned short int __tags;
>        unsigned short int __glibc_reserved3;
>        unsigned int __eip;
>        unsigned short int __cs_selector;
>        unsigned int __opcode:11;
>        unsigned int __glibc_reserved4:5;
>        unsigned int __data_offset;
>        unsigned short int __data_selector;
>        unsigned short int __glibc_reserved5;
>        unsigned int __mxcsr;
>    } fenv_t;
>
>    // From fenv(3)
>    int fegetenv(fenv_t *envp);
>    int fesetenv(const fenv_t *envp);
>""")
>
>def print_fenv():
>    print('Printing out floating point environment; float value: ', float('4.74303020008e-322'))
>    fenv = ffi.new("fenv_t[1]")
>    C.fegetenv(fenv)
>    for name in '''__control_word __glibc_reserved1 __status_word
>                __glibc_reserved2 __tags __glibc_reserved3 __eip __cs_selector
>                __opcode __glibc_reserved4 __data_offset __data_selector
>                __glibc_reserved5 __mxcsr
>                '''.split():
>        value = getattr(fenv[0], name)
>        print(name, ':', hex(value), bin(value))
>
>C = ffi.dlopen(None)
>
>saved = ffi.new("fenv_t[1]")
>C.fegetenv(saved)
>
>print_fenv()
>
>print('importing osgeo')
>import osgeo
>
>print_fenv()
>
>print('resetting FP environment')
>C.fesetenv(saved)
>
>print_fenv()
>

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Attachments on bug 1127544: 1019306