[Git][freetype/freetype][master] * src/smooth/ftgrays.c (gray_render_conic) [SSE2]: Improve flow.

[Alexei Podtelezhnikov (@apodtele)]

Alexei Podtelezhnikov pushed to branch master at FreeType / FreeType

Commits:

• 7b308a29
  by Alexei Podtelezhnikov at 2023-09-28T22:56:15-04:00

  * src/smooth/ftgrays.c (gray_render_conic) [SSE2]: Improve flow.
  

1 changed file:

• src/smooth/ftgrays.c

Changes:

src/smooth/ftgrays.c

---

...	...	@@ -1095,16 +1095,17 @@ typedef ptrdiff_t FT_PtrDist;
1095	1095	return;
1096	1096	}
1097	1097
1098		- /* We can calculate the number of necessary bisections because */
	1098	+ /* We can calculate the number of necessary segments because */
1099	1099	/* each bisection predictably reduces deviation exactly 4-fold. */
1100	1100	/* Even 32-bit deviation would vanish after 16 bisections. */
1101		- shift = 0;
	1101	+ shift = 16;
1102	1102	do
1103	1103	{
1104		- dx >>= 2;
1105		- shift += 1;
	1104	+ dx >>= 2;
	1105	+ shift--;
1106	1106
1107	1107	} while ( dx > ONE_PIXEL / 4 );
	1108	+ count = 0x10000U >> shift;
1108	1109
1109	1110	/*
1110	1111	* The (P0,P1,P2) arc equation, for t in [0,1] range:
...	...	@@ -1151,9 +1152,8 @@ typedef ptrdiff_t FT_PtrDist;
1151	1152	*/
1152	1153
1153	1154	#if FT_SSE2
1154		- /* Experience shows that for small shift values, */
1155		- /* SSE2 is actually slower. */
1156		- if ( shift > 2 )
	1155	+ /* Experience shows that for small counts, SSE2 is actually slower. */
	1156	+ if ( count > 4 )
1157	1157	{
1158	1158	union
1159	1159	{
...	...	@@ -1169,9 +1169,7 @@ typedef ptrdiff_t FT_PtrDist;
1169	1169
1170	1170	} v;
1171	1171
1172		- __m128i a, b;
1173		- __m128i r, q, q2;
1174		- __m128i p;
	1172	+ __m128i p, q, r;
1175	1173
1176	1174
1177	1175	u.i.ax = ax;
...	...	@@ -1179,14 +1177,13 @@ typedef ptrdiff_t FT_PtrDist;
1179	1177	u.i.bx = bx;
1180	1178	u.i.by = by;
1181	1179
1182		- a = _mm_load_si128( &u.vec.a );
1183		- b = _mm_load_si128( &u.vec.b );
	1180	+ q = _mm_load_si128( &u.vec.b );
	1181	+ r = _mm_load_si128( &u.vec.a );
1184	1182
1185		- r = _mm_slli_epi64( a, 33 - 2 * shift );
1186		- q = _mm_slli_epi64( b, 33 - shift );
1187		- q2 = _mm_slli_epi64( a, 32 - 2 * shift );
1188		-
1189		- q = _mm_add_epi64( q2, q );
	1183	+ q = _mm_slli_epi64( q, shift + 17);
	1184	+ r = _mm_slli_epi64( r, shift + shift );
	1185	+ q = _mm_add_epi64( q, r );
	1186	+ r = _mm_add_epi64( r, r );
1190	1187
1191	1188	v.i.px_lo = 0;
1192	1189	v.i.px_hi = p0.x;
...	...	@@ -1195,7 +1192,7 @@ typedef ptrdiff_t FT_PtrDist;
1195	1192
1196	1193	p = _mm_load_si128( &v.vec );
1197	1194
1198		- for ( count = 1U << shift; count > 0; count-- )
	1195	+ do
1199	1196	{
1200	1197	p = _mm_add_epi64( p, q );
1201	1198	q = _mm_add_epi64( q, r );
...	...	@@ -1203,22 +1200,25 @@ typedef ptrdiff_t FT_PtrDist;
1203	1200	_mm_store_si128( &v.vec, p );
1204	1201
1205	1202	gray_render_line( RAS_VAR_ v.i.px_hi, v.i.py_hi );
1206		- }
	1203	+ } while ( --count );
1207	1204
1208	1205	return;
1209	1206	}
1210	1207	#endif /* FT_SSE2 */
1211	1208
1212		- rx = LEFT_SHIFT( ax, 33 - 2 * shift );
1213		- ry = LEFT_SHIFT( ay, 33 - 2 * shift );
	1209	+ rx = LEFT_SHIFT( ax, shift + shift );
	1210	+ ry = LEFT_SHIFT( ay, shift + shift );
	1211	+
	1212	+ qx = LEFT_SHIFT( bx, shift + 17 ) + rx;
	1213	+ qy = LEFT_SHIFT( by, shift + 17 ) + ry;
1214	1214
1215		- qx = LEFT_SHIFT( bx, 33 - shift ) + LEFT_SHIFT( ax, 32 - 2 * shift );
1216		- qy = LEFT_SHIFT( by, 33 - shift ) + LEFT_SHIFT( ay, 32 - 2 * shift );
	1215	+ rx *= 2;
	1216	+ ry *= 2;
1217	1217
1218	1218	px = LEFT_SHIFT( p0.x, 32 );
1219	1219	py = LEFT_SHIFT( p0.y, 32 );
1220	1220
1221		- for ( count = 1U << shift; count > 0; count-- )
	1221	+ do
1222	1222	{
1223	1223	px += qx;
1224	1224	py += qy;
...	...	@@ -1227,7 +1227,7 @@ typedef ptrdiff_t FT_PtrDist;
1227	1227
1228	1228	gray_render_line( RAS_VAR_ (FT_Pos)( px >> 32 ),
1229	1229	(FT_Pos)( py >> 32 ) );
1230		- }
	1230	+ } while ( --count );
1231	1231	}
1232	1232
1233	1233	#else /* !BEZIER_USE_DDA */

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