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cell: optimize unpack_colors() function, saving 12 cycles

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This commit is contained in:
Brian Paul
2009-01-11 15:28:38 -07:00
parent 6324c77e01
commit 516dd9b361
1 changed files with 38 additions and 35 deletions
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src/gallium/drivers/cell/ppu/cell_gen_fragment.c
+38 -35
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@@ -291,61 +291,61 @@ unpack_colors(struct spe_function *f,
int fbRGBA_reg,
int fbR_reg, int fbG_reg, int fbB_reg, int fbA_reg)
{
int mask_reg = spe_allocate_available_register(f);
int mask0_reg = spe_allocate_available_register(f);
int mask1_reg = spe_allocate_available_register(f);
int mask2_reg = spe_allocate_available_register(f);
int mask3_reg = spe_allocate_available_register(f);
/* mask = {0x000000ff, 0x000000ff, 0x000000ff, 0x000000ff} */
spe_load_int(f, mask_reg, 0xff);
spe_load_int(f, mask0_reg, 0xff);
spe_load_int(f, mask1_reg, 0xff00);
spe_load_int(f, mask2_reg, 0xff0000);
spe_load_int(f, mask3_reg, 0xff000000);
spe_comment(f, 0, "Unpack framebuffer colors, convert to floats");
/* XXX there may be more clever ways to implement the following code */
switch (color_format) {
case PIPE_FORMAT_A8R8G8B8_UNORM:
/* fbB = fbB & mask */
spe_and(f, fbB_reg, fbRGBA_reg, mask_reg);
/* mask = mask << 8 */
spe_roti(f, mask_reg, mask_reg, 8);
/* fbB = fbRGBA & mask */
spe_and(f, fbB_reg, fbRGBA_reg, mask0_reg);
/* fbG = fbRGBA & mask */
spe_and(f, fbG_reg, fbRGBA_reg, mask_reg);
/* fbG = fbG >> 8 */
spe_roti(f, fbG_reg, fbG_reg, -8);
/* mask = mask << 8 */
spe_roti(f, mask_reg, mask_reg, 8);
spe_and(f, fbG_reg, fbRGBA_reg, mask1_reg);
/* fbR = fbRGBA & mask */
spe_and(f, fbR_reg, fbRGBA_reg, mask_reg);
/* fbR = fbR >> 16 */
spe_roti(f, fbR_reg, fbR_reg, -16);
/* mask = mask << 8 */
spe_roti(f, mask_reg, mask_reg, 8);
spe_and(f, fbR_reg, fbRGBA_reg, mask2_reg);
/* fbA = fbRGBA & mask */
spe_and(f, fbA_reg, fbRGBA_reg, mask_reg);
spe_and(f, fbA_reg, fbRGBA_reg, mask3_reg);
/* fbG = fbG >> 8 */
spe_roti(f, fbG_reg, fbG_reg, -8);
/* fbR = fbR >> 16 */
spe_roti(f, fbR_reg, fbR_reg, -16);
/* fbA = fbA >> 24 */
spe_roti(f, fbA_reg, fbA_reg, -24);
break;
case PIPE_FORMAT_B8G8R8A8_UNORM:
/* fbA = fbA & mask */
spe_and(f, fbA_reg, fbRGBA_reg, mask_reg);
/* mask = mask << 8 */
spe_roti(f, mask_reg, mask_reg, 8);
/* fbA = fbRGBA & mask */
spe_and(f, fbA_reg, fbRGBA_reg, mask0_reg);
/* fbR = fbRGBA & mask */
spe_and(f, fbR_reg, fbRGBA_reg, mask_reg);
/* fbR = fbR >> 8 */
spe_roti(f, fbR_reg, fbR_reg, -8);
/* mask = mask << 8 */
spe_roti(f, mask_reg, mask_reg, 8);
spe_and(f, fbR_reg, fbRGBA_reg, mask1_reg);
/* fbG = fbRGBA & mask */
spe_and(f, fbG_reg, fbRGBA_reg, mask_reg);
/* fbG = fbG >> 16 */
spe_roti(f, fbG_reg, fbG_reg, -16);
/* mask = mask << 8 */
spe_roti(f, mask_reg, mask_reg, 8);
spe_and(f, fbG_reg, fbRGBA_reg, mask2_reg);
/* fbB = fbRGBA & mask */
spe_and(f, fbB_reg, fbRGBA_reg, mask_reg);
spe_and(f, fbB_reg, fbRGBA_reg, mask3_reg);
/* fbR = fbR >> 8 */
spe_roti(f, fbR_reg, fbR_reg, -8);
/* fbG = fbG >> 16 */
spe_roti(f, fbG_reg, fbG_reg, -16);
/* fbB = fbB >> 24 */
spe_roti(f, fbB_reg, fbB_reg, -24);
break;
@@ -360,7 +360,10 @@ unpack_colors(struct spe_function *f,
spe_cuflt(f, fbB_reg, fbB_reg, 8);
spe_cuflt(f, fbA_reg, fbA_reg, 8);
spe_release_register(f, mask_reg);
spe_release_register(f, mask0_reg);
spe_release_register(f, mask1_reg);
spe_release_register(f, mask2_reg);
spe_release_register(f, mask3_reg);
}