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intel/brw: Ensure BROADCAST() value respect register alignment

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If we have a non-register-aligned source, MOV it to a new register
so that the invariant expected when generating SHADER_OPCODE_BROADCAST
is respected.

Added to ensure a later patch won't hit the `src.subnr == 0` assertion
in brw_broadcast() generation code.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31029>
This commit is contained in:
Caio Oliveira 2024-09-06 15:11:34 -07:00 • committed by Marge Bot
parent d97381efd8
commit f20df2984d
1 changed files with 7 additions and 0 deletions
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7
src/intel/compiler/brw_fs_builder.h
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@ -773,6 +773,13 @@ namespace brw {
BROADCAST(brw_reg value, brw_reg index) const
{
const brw_reg dst = vgrf(value.type);
/* Ensure that the source of a broadcast is always register aligned.
* See brw_broadcast() non-scalar case for more details.
*/
if (reg_offset(value) % (REG_SIZE * reg_unit(shader->devinfo)) != 0)
value = MOV(value);
exec_all().emit(SHADER_OPCODE_BROADCAST, dst, value, index);
return component(dst, 0);
}