diff options
| author | Vasily Khoruzhick <[email protected]> | 2020-03-10 01:30:14 -0700 |
|---|---|---|
| committer | Vasily Khoruzhick <[email protected]> | 2020-03-16 16:28:33 -0700 |
| commit | 2756b629171f61ca8e162be7b332e91a62c5c978 (patch) | |
| tree | 052810b07014c013f15891064401bc0925f3ffe5 /src/gallium/drivers/lima/ir | |
| parent | b7d89476f1e7d0f3b9e751887f42b750a5ec216e (diff) | |
lima/gpir: add better lowering for ftrunc
GP doesn't support ftrunc natively and unfortunately one in generic
opt_algebraic is not GP-friendly either. Introduce our own lowering
that utilizes fsign() that GP supports:
ftrunc(a) = fmul(fsign(a), ffloor(fmax(a, -a)))
Tested-by: Andreas Baierl <[email protected]>
Reviewed-by: Andreas Baierl <[email protected]>
Signed-off-by: Vasily Khoruzhick <[email protected]>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4126>
Diffstat (limited to 'src/gallium/drivers/lima/ir')
| -rw-r--r-- | src/gallium/drivers/lima/ir/lima_ir.h | 1 | ||||
| -rw-r--r-- | src/gallium/drivers/lima/ir/lima_nir_algebraic.py | 7 |
2 files changed, 8 insertions, 0 deletions
diff --git a/src/gallium/drivers/lima/ir/lima_ir.h b/src/gallium/drivers/lima/ir/lima_ir.h index b160dc96738..8bd72c55abe 100644 --- a/src/gallium/drivers/lima/ir/lima_ir.h +++ b/src/gallium/drivers/lima/ir/lima_ir.h @@ -65,6 +65,7 @@ struct ra_regs *ppir_regalloc_init(void *mem_ctx); void lima_nir_lower_uniform_to_scalar(nir_shader *shader); bool lima_nir_scale_trig(nir_shader *shader); +bool lima_nir_lower_ftrunc(nir_shader *shader); bool lima_nir_split_load_input(nir_shader *shader); #endif diff --git a/src/gallium/drivers/lima/ir/lima_nir_algebraic.py b/src/gallium/drivers/lima/ir/lima_nir_algebraic.py index 86f769587aa..db0ccc75bf5 100644 --- a/src/gallium/drivers/lima/ir/lima_nir_algebraic.py +++ b/src/gallium/drivers/lima/ir/lima_nir_algebraic.py @@ -32,6 +32,11 @@ scale_trig = [ (('fcos', 'a'), ('fcos', ('fmul', 'a', 1.0 / (2.0 * pi)))), ] +# GP has fsign op, so we can use cheaper lowering than one in generic opt_algebraic +lower_ftrunc = [ + (('ftrunc', 'a'), ('fmul', ('fsign', 'a'), ('ffloor', ('fmax', 'a', ('fneg', 'a'))))) +] + def main(): parser = argparse.ArgumentParser() parser.add_argument('-p', '--import-path', required=True) @@ -47,6 +52,8 @@ def run(): print(nir_algebraic.AlgebraicPass("lima_nir_scale_trig", scale_trig).render()) + print(nir_algebraic.AlgebraicPass("lima_nir_lower_ftrunc", + lower_ftrunc).render()) if __name__ == '__main__': main() |