pan/mdg: Ingest actual isub ops

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4852>
2020-04-30 15:41:10 -04:00 · 2020-04-30 15:41:10 -04:00 · f47c60b411
parent f8601110e4
commit f47c60b411
2 changed files with 3 additions and 1 deletions
--- a/src/panfrost/midgard/midgard_compile.h
+++ b/src/panfrost/midgard/midgard_compile.h
@ -38,7 +38,6 @@ midgard_compile_shader_nir(nir_shader *nir, panfrost_program *program, bool is_b

 static const nir_shader_compiler_options midgard_nir_options = {
        .lower_ffma = true,
-        .lower_sub = true,
        .lower_scmp = true,
        .lower_flrp16 = true,
        .lower_flrp32 = true,
--- a/src/panfrost/midgard/midgard_nir_algebraic.py
+++ b/src/panfrost/midgard/midgard_nir_algebraic.py
@ -37,6 +37,9 @@ algebraic_late = [

    (('ineg', a), ('isub', 0, a)),

+    # Likewise we want fsub lowered but not isub
+    (('fsub', a, b), ('fadd', a, ('fneg', b))),
+
    # These two special-cases save space/an op than the actual csel op +
    # scheduler flexibility