radeonsi: lower ffma in nir to mad.

This lowers ffma to a * b + c.

This seems like it should keep Marek happiest, so
we'd never get to the fma instruction emission code.

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/src/gallium/drivers/radeonsi/si_pipe.c b/src/gallium/drivers/radeonsi/si_pipe.c
index 82ed3d7..5b5f83a 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_pipe.c
+++ b/src/gallium/drivers/radeonsi/si_pipe.c
@@ -795,6 +795,7 @@ static const struct nir_shader_compiler_options nir_options = {
        .lower_fsat = true,
        .lower_fdiv = true,
        .lower_sub = true,
+       .lower_ffma = true,
        .lower_pack_snorm_2x16 = true,
        .lower_pack_snorm_4x8 = true,
        .lower_pack_unorm_2x16 = true,