fdo-mirrors/mesa
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/mesa/mesa.git synced 2026-05-06 13:48:06 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

nir: Don't use ffma in nir_lower_wpos_ytransform().

Browse source 
ffma is an explicitly fused multiply add with higher precision.
The optimizer will take care of promoting mul/add to fma when
it's beneficial to do so.

This fixes failures on Gen4-5 when using this pass, as those platforms
don't actually implement fma().

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Kenneth Graunke 2016-05-18 12:14:02 -07:00
parent b8b1b1c34c
commit 12ab7fc6ac
1 changed files with 8 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

20
src/compiler/nir/nir_lower_wpos_ytransform.c
View file

@ -123,19 +123,15 @@ emit_wpos_adjustment(lower_wpos_ytransform_state *state,
* inversion/identity, or the other way around if we're drawing to an FBO.
*/
if (invert) {
/* MAD wpos_temp.y, wpos_input, wpostrans.xxxx, wpostrans.yyyy
*/
wpos_temp_y = nir_ffma(b,
nir_channel(b, wpos_temp, 1),
nir_channel(b, wpostrans, 0),
nir_channel(b, wpostrans, 1));
/* wpos_temp.y = wpos_input * wpostrans.xxxx + wpostrans.yyyy */
wpos_temp_y = nir_fadd(b, nir_fmul(b, nir_channel(b, wpos_temp, 1),
nir_channel(b, wpostrans, 0)),
nir_channel(b, wpostrans, 1));
} else {
/* MAD wpos_temp.y, wpos_input, wpostrans.zzzz, wpostrans.wwww
*/
wpos_temp_y = nir_ffma(b,
nir_channel(b, wpos_temp, 1),
nir_channel(b, wpostrans, 2),
nir_channel(b, wpostrans, 3));
/* wpos_temp.y = wpos_input * wpostrans.zzzz + wpostrans.wwww */
wpos_temp_y = nir_fadd(b, nir_fmul(b, nir_channel(b, wpos_temp, 1),
nir_channel(b, wpostrans, 2)),
nir_channel(b, wpostrans, 3));
}
wpos_temp = nir_vec4(b,