[Bug middle-end/86680] possible gcc optimization

[florian.laroche at googlemail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86680

--- Comment #11 from Florian La Roche <florian.laroche at googlemail dot com> 
---
Below my current code that disables optimization for this one function and thus
generates ok code length.

best regards,

Florian La Roche




#if __GNUC__ > 4
#define __gcc_no_ivopts __attribute__ ((optimize("no-ivopts")))
#else
#define __gcc_no_ivopts
#endif

extern unsigned long __bss_start[], __bss_end[];

void __gcc_no_ivopts clear_bss(void)
{
    unsigned long *bss = __bss_start;
#if 1
    while (bss < __bss_end)
        *bss++ = 0UL;
#else
    unsigned long i, end = (__bss_end - __bss_start) * sizeof(unsigned long);
    for (i = 0; i < end; i += sizeof(unsigned long))
        *bss++ = 0UL;
#endif
}