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r600/sfn: check used channels when evaluating allowed mask

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Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/7878

v2: Fix ws in comment (iorn10)

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20283>
This commit is contained in:
Gert Wollny 2022-12-12 13:44:01 +01:00 • committed by Marge Bot
parent 8c30cf4443
commit edabd5cd84
1 changed files with 21 additions and 1 deletions
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22
src/gallium/drivers/r600/sfn/sfn_instr_alu.cpp
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@ -468,7 +468,27 @@ AluInstr::set_sources(SrcValues src)
uint8_t AluInstr::allowed_src_chan_mask() const
{
return 0xf;
if (m_alu_slots < 2)
return 0xf;
int chan_use_count[4] = {0};
for (auto s : m_src) {
auto r = s->as_register();
if (r)
++chan_use_count[r->chan()];
}
/* Each channel can only be loaded in one of three cycles,
* so if a channel is already used three times, we can't
* add another source with this channel.
* Since we want to move away from one channel to another, it
* is not important to know which is the old channel that will
* be freed by the channel switch.*/
int mask = 0;
for (int i = 0; i < 4; ++i) {
if (chan_use_count[i] < 3)
mask |= 1 << i;
}
return mask;
}
uint8_t