[LLVMbugs] [Bug 3800] New: asm inline : Ran out of registers at -O0

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=3800

           Summary: asm inline : Ran out of registers at -O0
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Register Allocator
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: castet.matthieu at free.fr
                CC: llvmbugs at cs.uiuc.edu


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>


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