This function will be used to implement read_invocation (by specifying a
specific channel) and read_first_invocation (by not specifying a
channel).
---
src/intel/compiler/brw_fs_builder.h | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/src/intel/compiler/brw_fs_builder.h
b/src/intel/compiler/brw_fs_builder.h
index 87394bc17b..144ee54916 100644
--- a/src/intel/compiler/brw_fs_builder.h
+++ b/src/intel/compiler/brw_fs_builder.h
@@ -393,7 +393,7 @@ namespace brw {
* Copy any live channel from \p src to the first channel of the result.
*/
src_reg
- emit_uniformize(const src_reg &src) const
+ emit_uniformize(const src_reg &src, dst_reg chan_index = dst_reg()) const
{
/* FIXME: We use a vector chan_index and dst to allow constant and
* copy propagration to move result all the way into the consuming
@@ -403,10 +403,13 @@ namespace brw {
* should go back to scalar destinations here.
*/
const fs_builder ubld = exec_all();
- const dst_reg chan_index = vgrf(BRW_REGISTER_TYPE_UD);
const dst_reg dst = vgrf(src.type);
- ubld.emit(SHADER_OPCODE_FIND_LIVE_CHANNEL, chan_index);
+ if (chan_index.file == BAD_FILE) {
+ chan_index = vgrf(BRW_REGISTER_TYPE_UD);
+ ubld.emit(SHADER_OPCODE_FIND_LIVE_CHANNEL, chan_index);
+ }
+
ubld.emit(SHADER_OPCODE_BROADCAST, dst, src, component(chan_index,
0));
return src_reg(component(dst, 0));
--
2.13.0
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