📄 pnggccrd.c
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// preload "movl dstptr, %%edi \n\t" // load dest
"cmpl $0, %%ecx \n\t" // len == 0 ?
"je mainloop8end \n\t"
"mainloop8: \n\t"
"movq (%%esi), %%mm4 \n\t" // *srcptr
"pand %%mm0, %%mm4 \n\t"
"movq %%mm0, %%mm6 \n\t"
"pandn (%%edi), %%mm6 \n\t" // *dstptr
"por %%mm6, %%mm4 \n\t"
"movq %%mm4, (%%edi) \n\t"
"addl $8, %%esi \n\t" // inc by 8 bytes processed
"addl $8, %%edi \n\t"
"subl $8, %%ecx \n\t" // dec by 8 pixels processed
"ja mainloop8 \n\t"
"mainloop8end: \n\t"
// preload "movl diff, %%ecx \n\t" // (diff is in eax)
"movl %%eax, %%ecx \n\t"
"cmpl $0, %%ecx \n\t"
"jz end8 \n\t"
// preload "movl mask, %%edx \n\t"
"sall $24, %%edx \n\t" // make low byte, high byte
"secondloop8: \n\t"
"sall %%edx \n\t" // move high bit to CF
"jnc skip8 \n\t" // if CF = 0
"movb (%%esi), %%al \n\t"
"movb %%al, (%%edi) \n\t"
"skip8: \n\t"
"incl %%esi \n\t"
"incl %%edi \n\t"
"decl %%ecx \n\t"
"jnz secondloop8 \n\t"
"end8: \n\t"
"EMMS \n\t" // DONE
: "=a" (dummy_value_a), // output regs (dummy)
"=d" (dummy_value_d),
"=c" (dummy_value_c),
"=S" (dummy_value_S),
"=D" (dummy_value_D)
: "3" (srcptr), // esi // input regs
"4" (dstptr), // edi
"0" (diff), // eax
// was (unmask) "b" RESERVED // ebx // Global Offset Table idx
"2" (len), // ecx
"1" (mask) // edx
#if 0 /* MMX regs (%mm0, etc.) not supported by gcc 2.7.2.3 or egcs 1.1 */
: "%mm0", "%mm4", "%mm6", "%mm7" // clobber list
#endif
);
}
else /* mmx _not supported - Use modified C routine */
#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
{
register png_uint_32 i;
png_uint_32 initial_val = png_pass_start[png_ptr->pass];
/* png.c: png_pass_start[] = {0, 4, 0, 2, 0, 1, 0}; */
register int stride = png_pass_inc[png_ptr->pass];
/* png.c: png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1}; */
register int rep_bytes = png_pass_width[png_ptr->pass];
/* png.c: png_pass_width[] = {8, 4, 4, 2, 2, 1, 1}; */
png_uint_32 len = png_ptr->width &~7; /* reduce to mult. of 8 */
int diff = (int) (png_ptr->width & 7); /* amount lost */
register png_uint_32 final_val = len; /* GRR bugfix */
srcptr = png_ptr->row_buf + 1 + initial_val;
dstptr = row + initial_val;
for (i = initial_val; i < final_val; i += stride)
{
png_memcpy(dstptr, srcptr, rep_bytes);
srcptr += stride;
dstptr += stride;
}
if (diff) /* number of leftover pixels: 3 for pngtest */
{
final_val+=diff /* *BPP1 */ ;
for (; i < final_val; i += stride)
{
if (rep_bytes > (int)(final_val-i))
rep_bytes = (int)(final_val-i);
png_memcpy(dstptr, srcptr, rep_bytes);
srcptr += stride;
dstptr += stride;
}
}
} /* end of else (_mmx_supported) */
break;
} /* end 8 bpp */
case 16: /* png_ptr->row_info.pixel_depth */
{
png_bytep srcptr;
png_bytep dstptr;
#if defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_THREAD_UNSAFE_OK)
if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)
/* && _mmx_supported */ )
{
png_uint_32 len;
int diff;
int dummy_value_a; // fix 'forbidden register spilled' error
int dummy_value_d;
int dummy_value_c;
int dummy_value_S;
int dummy_value_D;
_unmask = ~mask; // global variable for -fPIC version
srcptr = png_ptr->row_buf + 1;
dstptr = row;
len = png_ptr->width &~7; // reduce to multiple of 8
diff = (int) (png_ptr->width & 7); // amount lost //
__asm__ __volatile__ (
"movd _unmask, %%mm7 \n\t" // load bit pattern
"psubb %%mm6, %%mm6 \n\t" // zero mm6
"punpcklbw %%mm7, %%mm7 \n\t"
"punpcklwd %%mm7, %%mm7 \n\t"
"punpckldq %%mm7, %%mm7 \n\t" // fill reg with 8 masks
"movq _mask16_0, %%mm0 \n\t"
"movq _mask16_1, %%mm1 \n\t"
"pand %%mm7, %%mm0 \n\t"
"pand %%mm7, %%mm1 \n\t"
"pcmpeqb %%mm6, %%mm0 \n\t"
"pcmpeqb %%mm6, %%mm1 \n\t"
// preload "movl len, %%ecx \n\t" // load length of line
// preload "movl srcptr, %%esi \n\t" // load source
// preload "movl dstptr, %%edi \n\t" // load dest
"cmpl $0, %%ecx \n\t"
"jz mainloop16end \n\t"
"mainloop16: \n\t"
"movq (%%esi), %%mm4 \n\t"
"pand %%mm0, %%mm4 \n\t"
"movq %%mm0, %%mm6 \n\t"
"movq (%%edi), %%mm7 \n\t"
"pandn %%mm7, %%mm6 \n\t"
"por %%mm6, %%mm4 \n\t"
"movq %%mm4, (%%edi) \n\t"
"movq 8(%%esi), %%mm5 \n\t"
"pand %%mm1, %%mm5 \n\t"
"movq %%mm1, %%mm7 \n\t"
"movq 8(%%edi), %%mm6 \n\t"
"pandn %%mm6, %%mm7 \n\t"
"por %%mm7, %%mm5 \n\t"
"movq %%mm5, 8(%%edi) \n\t"
"addl $16, %%esi \n\t" // inc by 16 bytes processed
"addl $16, %%edi \n\t"
"subl $8, %%ecx \n\t" // dec by 8 pixels processed
"ja mainloop16 \n\t"
"mainloop16end: \n\t"
// preload "movl diff, %%ecx \n\t" // (diff is in eax)
"movl %%eax, %%ecx \n\t"
"cmpl $0, %%ecx \n\t"
"jz end16 \n\t"
// preload "movl mask, %%edx \n\t"
"sall $24, %%edx \n\t" // make low byte, high byte
"secondloop16: \n\t"
"sall %%edx \n\t" // move high bit to CF
"jnc skip16 \n\t" // if CF = 0
"movw (%%esi), %%ax \n\t"
"movw %%ax, (%%edi) \n\t"
"skip16: \n\t"
"addl $2, %%esi \n\t"
"addl $2, %%edi \n\t"
"decl %%ecx \n\t"
"jnz secondloop16 \n\t"
"end16: \n\t"
"EMMS \n\t" // DONE
: "=a" (dummy_value_a), // output regs (dummy)
"=c" (dummy_value_c),
"=d" (dummy_value_d),
"=S" (dummy_value_S),
"=D" (dummy_value_D)
: "0" (diff), // eax // input regs
// was (unmask) " " RESERVED // ebx // Global Offset Table idx
"1" (len), // ecx
"2" (mask), // edx
"3" (srcptr), // esi
"4" (dstptr) // edi
#if 0 /* MMX regs (%mm0, etc.) not supported by gcc 2.7.2.3 or egcs 1.1 */
: "%mm0", "%mm1", "%mm4" // clobber list
, "%mm5", "%mm6", "%mm7"
#endif
);
}
else /* mmx _not supported - Use modified C routine */
#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
{
register png_uint_32 i;
png_uint_32 initial_val = BPP2 * png_pass_start[png_ptr->pass];
/* png.c: png_pass_start[] = {0, 4, 0, 2, 0, 1, 0}; */
register int stride = BPP2 * png_pass_inc[png_ptr->pass];
/* png.c: png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1}; */
register int rep_bytes = BPP2 * png_pass_width[png_ptr->pass];
/* png.c: png_pass_width[] = {8, 4, 4, 2, 2, 1, 1}; */
png_uint_32 len = png_ptr->width &~7; /* reduce to mult. of 8 */
int diff = (int) (png_ptr->width & 7); /* amount lost */
register png_uint_32 final_val = BPP2 * len; /* GRR bugfix */
srcptr = png_ptr->row_buf + 1 + initial_val;
dstptr = row + initial_val;
for (i = initial_val; i < final_val; i += stride)
{
png_memcpy(dstptr, srcptr, rep_bytes);
srcptr += stride;
dstptr += stride;
}
if (diff) /* number of leftover pixels: 3 for pngtest */
{
final_val+=diff*BPP2;
for (; i < final_val; i += stride)
{
if (rep_bytes > (int)(final_val-i))
rep_bytes = (int)(final_val-i);
png_memcpy(dstptr, srcptr, rep_bytes);
srcptr += stride;
dstptr += stride;
}
}
} /* end of else (_mmx_supported) */
break;
} /* end 16 bpp */
case 24: /* png_ptr->row_info.pixel_depth */
{
png_bytep srcptr;
png_bytep dstptr;
#if defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_THREAD_UNSAFE_OK)
if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)
/* && _mmx_supported */ )
{
png_uint_32 len;
int diff;
int dummy_value_a; // fix 'forbidden register spilled' error
int dummy_value_d;
int dummy_value_c;
int dummy_value_S;
int dummy_value_D;
_unmask = ~mask; // global variable for -fPIC version
srcptr = png_ptr->row_buf + 1;
dstptr = row;
len = png_ptr->width &~7; // reduce to multiple of 8
diff = (int) (png_ptr->width & 7); // amount lost //
__asm__ __volatile__ (
"movd _unmask, %%mm7 \n\t" // load bit pattern
"psubb %%mm6, %%mm6 \n\t" // zero mm6
"punpcklbw %%mm7, %%mm7 \n\t"
"punpcklwd %%mm7, %%mm7 \n\t"
"punpckldq %%mm7, %%mm7 \n\t" // fill reg with 8 masks
"movq _mask24_0, %%mm0 \n\t"
"movq _mask24_1, %%mm1 \n\t"
"movq _mask24_2, %%mm2 \n\t"
"pand %%mm7, %%mm0 \n\t"
"pand %%mm7, %%mm1 \n\t"
"pand %%mm7, %%mm2 \n\t"
"pcmpeqb %%mm6, %%mm0 \n\t"
"pcmpeqb %%mm6, %%mm1 \n\t"
"pcmpeqb %%mm6, %%mm2 \n\t"
// preload "movl len, %%ecx \n\t" // load length of line
// preload "movl srcptr, %%esi \n\t" // load source
// preload "movl dstptr, %%edi \n\t" // load dest
"cmpl $0, %%ecx \n\t"
"jz mainloop24end \n\t"
"mainloop24: \n\t"
"movq (%%esi), %%mm4 \n\t"
"pand %%mm0, %%mm4 \n\t"
"movq %%mm0, %%mm6 \n\t"
"movq (%%edi), %%mm7 \n\t"
"pandn %%mm7, %%mm6 \n\t"
"por %%mm6, %%mm4 \n\t"
"movq %%mm4, (%%edi) \n\t"
"movq 8(%%esi), %%mm5 \n\t"
"pand %%mm1, %%mm5 \n\t"
"movq %%mm1, %%mm7 \n\t"
"movq 8(%%edi), %%mm6 \n\t"
"pandn %%mm6, %%mm7 \n\t"
"por %%mm7, %%mm5 \n\t"
"movq %%mm5, 8(%%edi) \n\t"
"movq 16(%%esi), %%mm6 \n\t"
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