Chiebot-Mirror
/
FFmpeg
mirror of https://github.com/FFmpeg/FFmpeg.git
8
0
Fork 0
Code Issues Projects Releases Wiki Activity

Use a faster way to compute 255-val: Instead of creating a vector of

Browse Source 
all 255s, and then doing the subtraction, nor of the vector with itself: saves
one instruction and a register.
Patch by Graham Booker % gbooker A tamu P edu%

Originally committed as revision 9340 to svn://svn.ffmpeg.org/ffmpeg/trunk
pull/126/head
Graham Booker 18 years ago committed by Guillaume Poirier
parent a444671542
commit f4a02f6e9b
1 changed files with 2 additions and 4 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Unified View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 6
      libavcodec/ppc/h264_altivec.c

6
libavcodec/ppc/h264_altivec.c
Unescape View File

@ -766,7 +766,6 @@ static inline vector unsigned char h264_deblock_mask ( register vector unsigned
const vector unsigned char A0v = vec_sl(vec_splat_u8(10), vec_splat_u8(4)); \ const vector unsigned char A0v = vec_sl(vec_splat_u8(10), vec_splat_u8(4)); \
\ \
register vector unsigned char pq0bit = vec_xor(p0,q0); \ register vector unsigned char pq0bit = vec_xor(p0,q0); \
register vector unsigned char temp; \
register vector unsigned char q1minus; \ register vector unsigned char q1minus; \
register vector unsigned char p0minus; \ register vector unsigned char p0minus; \
register vector unsigned char stage1; \ register vector unsigned char stage1; \
@ -775,11 +774,10 @@ static inline vector unsigned char h264_deblock_mask ( register vector unsigned
register vector unsigned char delta; \ register vector unsigned char delta; \
register vector unsigned char deltaneg; \ register vector unsigned char deltaneg; \
\ \
temp = (vector unsigned char)vec_cmpeq(p0, p0); \ q1minus = vec_nor(q1, q1); /* 255 - q1 */ \
q1minus = vec_xor(temp, q1); /* 255 - q1 */ \
stage1 = vec_avg(p1, q1minus); /* (p1 - q1 + 256)>>1 */ \ stage1 = vec_avg(p1, q1minus); /* (p1 - q1 + 256)>>1 */ \
stage2 = vec_sr(stage1, vec_splat_u8(1)); /* (p1 - q1 + 256)>>2 = 64 + (p1 - q1) >> 2 */ \ stage2 = vec_sr(stage1, vec_splat_u8(1)); /* (p1 - q1 + 256)>>2 = 64 + (p1 - q1) >> 2 */ \
p0minus = vec_xor(temp, p0); /* 255 - p0 */ \ p0minus = vec_nor(p0, p0); /* 255 - p0 */ \
stage1 = vec_avg(q0, p0minus); /* (q0 - p0 + 256)>>1 */ \ stage1 = vec_avg(q0, p0minus); /* (q0 - p0 + 256)>>1 */ \
pq0bit = vec_and(pq0bit, vec_splat_u8(1)); \ pq0bit = vec_and(pq0bit, vec_splat_u8(1)); \
stage2 = vec_avg(stage2, pq0bit); /* 32 + ((q0 - p0)&1 + (p1 - q1) >> 2 + 1) >> 1 */ \ stage2 = vec_avg(stage2, pq0bit); /* 32 + ((q0 - p0)&1 + (p1 - q1) >> 2 + 1) >> 1 */ \

Write Preview
Loading…
Cancel
Save