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#470: remove unproductive optimizations from row filter

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This commit is contained in:
Cameron Kaiser 2018-01-27 09:45:04 -08:00
parent 7b68aa337f
commit 8f15c68ae7
1 changed files with 2 additions and 11 deletions
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13
gfx/ycbcr/yuv_convert_ppc.cpp
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@ -29,21 +29,12 @@ void FilterRows_VMX(uint8* ybuf, const uint8* y0_ptr, const uint8* y1_ptr,
uint8 *end = ybuf + source_width;
// Compute a weighted average.
do {
vector unsigned char r0;
vector unsigned char c0 = vec_ld(0, y0_ptr);
vector unsigned char c1 = vec_ld(0, y1_ptr);
// Compute a weighted average.
// Quick trivial cases first:
// If source_y_fraction is 0, then the result is y0, etc.
if (source_y_fraction < 1) {
r0 = c0;
} else if (source_y_fraction > 255) {
r0 = c1;
// Sure would be nice to use vec_avg for 128, but it doesn't quite
// work, so here's the long case for everything else.
} else {
// another VMX annoyance: unpackh/l are SIGNED. bastard Motorola.
register vector unsigned short y0 = vec_mergeh(vector_c_zero, c0);
register vector unsigned short y1 = vec_mergeh(vector_c_zero, c1);
@ -60,7 +51,7 @@ void FilterRows_VMX(uint8* ybuf, const uint8* y0_ptr, const uint8* y1_ptr,
y2 = vec_sr(y2, vector_eight);
r0 = vec_pack(y0, y2);
}
vec_st(r0, 0, (unsigned char *)ybuf);
ybuf += 16;
y0_ptr += 16;