Hi,

when compiling asm inline at -O0, we can hit easily the "Ran out of registers" case.


$ cat /tmp/toto.c
#include <stdint.h>
void ff_h264_idct_dc_add_mmx2(uint8_t *dst, int16_t *block, int stride)
{
    __asm__ volatile(
        "movd          %0, %%mm2 \n\t"
        "movd          %1, %%mm3 \n\t"
        "movd          %2, %%mm4 \n\t"
        "movd          %3, %%mm5 \n\t"
        "movd       %%mm2, %0    \n\t"
        "movd       %%mm3, %1    \n\t"
        "movd       %%mm4, %2    \n\t"
        "movd       %%mm5, %3    \n\t"
        :"+m"(*(uint32_t*)(dst+0*stride)),
         "+m"(*(uint32_t*)(dst+1*stride)),
         "+m"(*(uint32_t*)(dst+2*stride)),
         "+m"(*(uint32_t*)(dst+3*stride))
    );
}
$ ccc -c -o /tmp/toto.o /tmp/toto.c                     Ran out of registers during register allocation!                                Please check your inline asm statement for invalid constraints:                 INLINEASM <es:movd          $0, %mm2                                                    movd          $1, %mm3                                                          movd          $2, %mm4 
        movd          $3, %mm5 
        movd       %mm2, $0    
        movd       %mm3, $1    
        movd       %mm4, $2    
        movd       %mm5, $3    
        >, 36, %EDI<kill>, 1, %reg0, 0, 36, %EBX<kill>, 1, %reg0, 0, 36, %EAX<kill>, 1, %reg0, 0, 36, %EDX<kill>, 1, %reg0, 0, 36, %ECX<kill>, 1, %reg0, 0, 36, %ESI<kill>, 1, %reg0, 0, 36, %EDI<kill>, 1, %reg0, 0, 36, %reg1070<kill>, 1, %reg0, 0, 14, %EFLAGS<earlyclobber,def,dead>