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[freetype2] master 7b308a29d: * src/smooth/ftgrays.c (gray_render_conic)
From: |
Werner Lemberg |
Subject: |
[freetype2] master 7b308a29d: * src/smooth/ftgrays.c (gray_render_conic) [SSE2]: Improve flow. |
Date: |
Thu, 28 Sep 2023 22:58:46 -0400 (EDT) |
branch: master
commit 7b308a29dd105074eea9c8d5953a182d325f74f1
Author: Alexei Podtelezhnikov <apodtele@gmail.com>
Commit: Alexei Podtelezhnikov <apodtele@gmail.com>
* src/smooth/ftgrays.c (gray_render_conic) [SSE2]: Improve flow.
---
src/smooth/ftgrays.c | 50 +++++++++++++++++++++++++-------------------------
1 file changed, 25 insertions(+), 25 deletions(-)
diff --git a/src/smooth/ftgrays.c b/src/smooth/ftgrays.c
index 0918272f8..fbf1541ef 100644
--- a/src/smooth/ftgrays.c
+++ b/src/smooth/ftgrays.c
@@ -1095,16 +1095,17 @@ typedef ptrdiff_t FT_PtrDist;
return;
}
- /* We can calculate the number of necessary bisections because */
+ /* We can calculate the number of necessary segments because */
/* each bisection predictably reduces deviation exactly 4-fold. */
/* Even 32-bit deviation would vanish after 16 bisections. */
- shift = 0;
+ shift = 16;
do
{
- dx >>= 2;
- shift += 1;
+ dx >>= 2;
+ shift--;
} while ( dx > ONE_PIXEL / 4 );
+ count = 0x10000U >> shift;
/*
* The (P0,P1,P2) arc equation, for t in [0,1] range:
@@ -1151,9 +1152,8 @@ typedef ptrdiff_t FT_PtrDist;
*/
#if FT_SSE2
- /* Experience shows that for small shift values, */
- /* SSE2 is actually slower. */
- if ( shift > 2 )
+ /* Experience shows that for small counts, SSE2 is actually slower. */
+ if ( count > 4 )
{
union
{
@@ -1169,9 +1169,7 @@ typedef ptrdiff_t FT_PtrDist;
} v;
- __m128i a, b;
- __m128i r, q, q2;
- __m128i p;
+ __m128i p, q, r;
u.i.ax = ax;
@@ -1179,14 +1177,13 @@ typedef ptrdiff_t FT_PtrDist;
u.i.bx = bx;
u.i.by = by;
- a = _mm_load_si128( &u.vec.a );
- b = _mm_load_si128( &u.vec.b );
+ q = _mm_load_si128( &u.vec.b );
+ r = _mm_load_si128( &u.vec.a );
- r = _mm_slli_epi64( a, 33 - 2 * shift );
- q = _mm_slli_epi64( b, 33 - shift );
- q2 = _mm_slli_epi64( a, 32 - 2 * shift );
-
- q = _mm_add_epi64( q2, q );
+ q = _mm_slli_epi64( q, shift + 17);
+ r = _mm_slli_epi64( r, shift + shift );
+ q = _mm_add_epi64( q, r );
+ r = _mm_add_epi64( r, r );
v.i.px_lo = 0;
v.i.px_hi = p0.x;
@@ -1195,7 +1192,7 @@ typedef ptrdiff_t FT_PtrDist;
p = _mm_load_si128( &v.vec );
- for ( count = 1U << shift; count > 0; count-- )
+ do
{
p = _mm_add_epi64( p, q );
q = _mm_add_epi64( q, r );
@@ -1203,22 +1200,25 @@ typedef ptrdiff_t FT_PtrDist;
_mm_store_si128( &v.vec, p );
gray_render_line( RAS_VAR_ v.i.px_hi, v.i.py_hi );
- }
+ } while ( --count );
return;
}
#endif /* FT_SSE2 */
- rx = LEFT_SHIFT( ax, 33 - 2 * shift );
- ry = LEFT_SHIFT( ay, 33 - 2 * shift );
+ rx = LEFT_SHIFT( ax, shift + shift );
+ ry = LEFT_SHIFT( ay, shift + shift );
+
+ qx = LEFT_SHIFT( bx, shift + 17 ) + rx;
+ qy = LEFT_SHIFT( by, shift + 17 ) + ry;
- qx = LEFT_SHIFT( bx, 33 - shift ) + LEFT_SHIFT( ax, 32 - 2 * shift );
- qy = LEFT_SHIFT( by, 33 - shift ) + LEFT_SHIFT( ay, 32 - 2 * shift );
+ rx *= 2;
+ ry *= 2;
px = LEFT_SHIFT( p0.x, 32 );
py = LEFT_SHIFT( p0.y, 32 );
- for ( count = 1U << shift; count > 0; count-- )
+ do
{
px += qx;
py += qy;
@@ -1227,7 +1227,7 @@ typedef ptrdiff_t FT_PtrDist;
gray_render_line( RAS_VAR_ (FT_Pos)( px >> 32 ),
(FT_Pos)( py >> 32 ) );
- }
+ } while ( --count );
}
#else /* !BEZIER_USE_DDA */
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- [freetype2] master 7b308a29d: * src/smooth/ftgrays.c (gray_render_conic) [SSE2]: Improve flow.,
Werner Lemberg <=