pan/mdg: Lower isub in common code

No shader-db changes.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Italo Nicola <italonicola@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23769>

src/panfrost/midgard/midgard_compile.h

@@ -51,6 +51,7 @@ static const nir_shader_compiler_options midgard_nir_options = {
    .lower_ffract = true,
    .lower_fmod = true,
    .lower_fdiv = true,
+   .lower_ineg = true,
    .lower_isign = true,
    .lower_fpow = true,
    .lower_find_lsb = true,

src/panfrost/midgard/midgard_nir_algebraic.py

@@ -41,12 +41,6 @@ algebraic = [
 ]
 
 algebraic_late = [
-    # ineg must be lowered late, but only for integers; floats will try to
-    # have modifiers attached... hence why this has to be here rather than
-    # a more standard lower_negate approach
-
-    (('ineg', a), ('isub', 0, a)),
-
     # Likewise we want fsub lowered but not isub
     (('fsub', a, b), ('fadd', a, ('fneg', b))),