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mmx: convert while (w) to if (w) when possible

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gcc isn't able to see that w is no greater than 1, so it generates
unnecessary loop instructions with while (w).

Signed-off-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Matt Turner 2011-09-23 14:10:52 -04:00
parent 38a7aae1d9
commit 57fd8c37aa
1 changed files with 5 additions and 24 deletions
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29
pixman/pixman-mmx.c
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@ -1142,12 +1142,9 @@ mmx_composite_over_n_8888 (pixman_implementation_t *imp,
CHECKPOINT (); CHECKPOINT ();
while (w) if (w)
{ {
*dst = store8888 (over (vsrc, vsrca, load8888 (*dst))); *dst = store8888 (over (vsrc, vsrca, load8888 (*dst)));
w--;
dst++;
} }
} }
@ -1383,16 +1380,12 @@ mmx_composite_over_8888_n_8888 (pixman_implementation_t *imp,
src += 2; src += 2;
} }
while (w) if (w)
{ {
__m64 s = load8888 (*src); __m64 s = load8888 (*src);
__m64 d = load8888 (*dst); __m64 d = load8888 (*dst);
*dst = store8888 (in_over (s, expand_alpha (s), vmask, d)); *dst = store8888 (in_over (s, expand_alpha (s), vmask, d));
w--;
dst++;
src++;
} }
} }
@ -1758,7 +1751,7 @@ mmx_composite_over_n_8_8888 (pixman_implementation_t *imp,
CHECKPOINT (); CHECKPOINT ();
while (w) if (w)
{ {
uint64_t m = *mask; uint64_t m = *mask;
@ -1770,10 +1763,6 @@ mmx_composite_over_n_8_8888 (pixman_implementation_t *imp,
vsrc, vsrca, expand_alpha_rev (to_m64 (m)), vdest); vsrc, vsrca, expand_alpha_rev (to_m64 (m)), vdest);
*dst = store8888 (vdest); *dst = store8888 (vdest);
} }
w--;
mask++;
dst++;
} }
} }
@ -2026,7 +2015,7 @@ mmx_composite_src_n_8_8888 (pixman_implementation_t *imp,
CHECKPOINT (); CHECKPOINT ();
while (w) if (w)
{ {
uint64_t m = *mask; uint64_t m = *mask;
@ -2041,10 +2030,6 @@ mmx_composite_src_n_8_8888 (pixman_implementation_t *imp,
{ {
*dst = 0; *dst = 0;
} }
w--;
mask++;
dst++;
} }
} }
@ -2366,16 +2351,12 @@ mmx_composite_over_pixbuf_8888 (pixman_implementation_t *imp,
src += 2; src += 2;
} }
while (w) if (w)
{ {
__m64 s = load8888 (*src); __m64 s = load8888 (*src);
__m64 d = load8888 (*dst); __m64 d = load8888 (*dst);
*dst = store8888 (over_rev_non_pre (s, d)); *dst = store8888 (over_rev_non_pre (s, d));
w--;
dst++;
src++;
} }
} }