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tried to avoid gcc 2.95.2 bug by puting explicit register constraints - added comment about rounding bug in some functions (need to correct or suppress them for regression tests) 

Originally committed as revision 515 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard 2002-05-18 22:49:11 +00:00
parent a6e14edde0
commit 9241551049
1 changed files with 20 additions and 16 deletions
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36
libavcodec/i386/dsputil_mmx_avg.h
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@ -21,6 +21,8 @@
* mostly rewritten by Michael Niedermayer <michaelni@gmx.at>
*/
/* XXX: we use explicit registers to avoid a gcc 2.95.2 register asm
clobber bug */
static void DEF(put_pixels_x2)(UINT8 *block, const UINT8 *pixels, int line_size, int h)
{
__asm __volatile(
@ -48,11 +50,12 @@ static void DEF(put_pixels_x2)(UINT8 *block, const UINT8 *pixels, int line_size,
"subl $4, %0 \n\t"
" jnz 1b \n\t"
:"+g"(h)
:"r"(pixels), "r"(pixels+line_size), "r" (block), "r" (block+line_size),
"r"(line_size<<1)
:"b"(pixels), "c"(pixels+line_size), "d" (block), "S" (block+line_size),
"D"(line_size<<1)
:"%eax", "memory");
}
/* GL: this function does incorrect rounding if overflow */
static void DEF(put_no_rnd_pixels_x2)(UINT8 *block, const UINT8 *pixels, int line_size, int h)
{
__asm __volatile(
@ -85,8 +88,8 @@ static void DEF(put_no_rnd_pixels_x2)(UINT8 *block, const UINT8 *pixels, int lin
"subl $4, %0 \n\t"
" jnz 1b \n\t"
:"+g"(h)
:"r"(pixels), "r"(pixels+line_size), "r" (block), "r" (block+line_size),
"r"(line_size<<1)
:"b"(pixels), "c"(pixels+line_size), "d" (block), "S" (block+line_size),
"D"(line_size<<1)
:"%eax", "memory");
}
@ -114,11 +117,12 @@ static void DEF(put_pixels_y2)(UINT8 *block, const UINT8 *pixels, int line_size,
"subl $4, %0 \n\t"
" jnz 1b \n\t"
:"+g"(h)
:"r"(pixels), "r"(pixels+line_size), "r"(pixels+line_size*2), "r" (block),
"r" (block+line_size), "g"(line_size<<1)
:"b"(pixels), "c"(pixels+line_size), "d"(pixels+line_size*2), "S" (block),
"D" (block+line_size), "g"(line_size<<1)
:"%eax", "memory");
}
/* GL: this function does incorrect rounding if overflow */
static void DEF(put_no_rnd_pixels_y2)(UINT8 *block, const UINT8 *pixels, int line_size, int h)
{
__asm __volatile(
@ -146,8 +150,8 @@ static void DEF(put_no_rnd_pixels_y2)(UINT8 *block, const UINT8 *pixels, int lin
"subl $4, %0 \n\t"
" jnz 1b \n\t"
:"+g"(h)
:"r"(pixels), "r"(pixels+line_size), "r"(pixels+line_size*2), "r" (block),
"r" (block+line_size), "g"(line_size<<1)
:"b"(pixels), "c"(pixels+line_size), "d"(pixels+line_size*2), "S" (block),
"D" (block+line_size), "g"(line_size<<1)
:"%eax", "memory");
}
@ -178,8 +182,8 @@ static void DEF(avg_pixels)(UINT8 *block, const UINT8 *pixels, int line_size, in
"subl $4, %0 \n\t"
" jnz 1b \n\t"
:"+g"(h)
:"r"(pixels), "r"(pixels+line_size), "r" (block), "r" (block+line_size),
"r"(line_size<<1)
:"b"(pixels), "c"(pixels+line_size), "d" (block), "S" (block+line_size),
"D"(line_size<<1)
:"%eax", "memory");
}
@ -218,8 +222,8 @@ static void DEF(avg_pixels_x2)(UINT8 *block, const UINT8 *pixels, int line_size,
"subl $4, %0 \n\t"
" jnz 1b \n\t"
:"+g"(h)
:"r"(pixels), "r"(pixels+line_size), "r" (block), "r" (block+line_size),
"r"(line_size<<1)
:"b"(pixels), "c"(pixels+line_size), "d" (block), "S" (block+line_size),
"D"(line_size<<1)
:"%eax", "memory");
}
@ -255,8 +259,8 @@ static void DEF(avg_pixels_y2)(UINT8 *block, const UINT8 *pixels, int line_size,
"subl $4, %0 \n\t"
" jnz 1b \n\t"
:"+g"(h)
:"r"(pixels), "r"(pixels+line_size), "r"(pixels+line_size*2), "r" (block),
"r" (block+line_size), "g"(line_size<<1)
:"b"(pixels), "c"(pixels+line_size), "d"(pixels+line_size*2), "S" (block),
"D" (block+line_size), "g"(line_size<<1)
:"%eax", "memory");
}
@ -305,8 +309,8 @@ static void DEF(avg_pixels_xy2)(UINT8 *block, const UINT8 *pixels, int line_size
"subl $4, %0 \n\t"
" jnz 1b \n\t"
:"+g"(h)
:"r"(pixels), "r"(pixels+line_size), "r"(pixels+line_size*2), "r" (block),
"r" (block+line_size), "g"(line_size<<1)
:"b"(pixels), "c"(pixels+line_size), "d"(pixels+line_size*2), "S" (block),
"D" (block+line_size), "g"(line_size<<1)
:"%eax", "memory");
}