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i965/vec4: Simplify reswizzle() using the swizzle utils.

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Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Francisco Jerez 2015-03-18 21:09:51 +02:00
parent 7b30493dc4
commit 05ec72d8ec
1 changed files with 11 additions and 29 deletions
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40
src/mesa/drivers/dri/i965/brw_vec4.cpp
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@ -978,43 +978,25 @@ vec4_instruction::can_reswizzle(int dst_writemask,
void
vec4_instruction::reswizzle(int dst_writemask, int swizzle)
{
int new_writemask = 0;
int new_swizzle[4] = { 0 };
/* Dot product instructions write a single result into all channels. */
/* Destination write mask doesn't correspond to source swizzle for the dot
* product and pack_bytes instructions.
*/
if (opcode != BRW_OPCODE_DP4 && opcode != BRW_OPCODE_DPH &&
opcode != BRW_OPCODE_DP3 && opcode != BRW_OPCODE_DP2) {
opcode != BRW_OPCODE_DP3 && opcode != BRW_OPCODE_DP2 &&
opcode != VEC4_OPCODE_PACK_BYTES) {
for (int i = 0; i < 3; i++) {
if (src[i].file == BAD_FILE || src[i].file == IMM)
continue;
/* Destination write mask doesn't correspond to source swizzle for the
* pack_bytes instruction.
*/
if (opcode == VEC4_OPCODE_PACK_BYTES)
continue;
for (int c = 0; c < 4; c++) {
new_swizzle[c] = BRW_GET_SWZ(src[i].swizzle, BRW_GET_SWZ(swizzle, c));
}
src[i].swizzle = BRW_SWIZZLE4(new_swizzle[0], new_swizzle[1],
new_swizzle[2], new_swizzle[3]);
src[i].swizzle = brw_compose_swizzle(swizzle, src[i].swizzle);
}
}
for (int c = 0; c < 4; c++) {
int bit = 1 << BRW_GET_SWZ(swizzle, c);
/* Skip components of the swizzle not used by the dst. */
if (!(dst_writemask & (1 << c)))
continue;
/* If we were populating this component, then populate the
* corresponding channel of the new dst.
*/
if (dst.writemask & bit)
new_writemask |= (1 << c);
}
dst.writemask = new_writemask;
/* Apply the specified swizzle and writemask to the original mask of
* written components.
*/
dst.writemask = dst_writemask &
brw_apply_swizzle_to_mask(swizzle, dst.writemask);
}
/*