nir/opt_algebraic: lower 64-bit fmin3/fmax3/fmed3

This unconditionally lowers 64-bit fmin3/fmax3/fmed3 because
AMD hardware doesn't have native instructions, and no drivers
except RADV uses these instructions.

Fixes dEQP-VK.spirv_assembly.instruction.amd_trinary_minmax.*.f64.*
with ACO.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4570>

diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py
index 69f804783b20827dfb12c5c52942b8f28a902151..00d18402bd1aa399df49493e5ee186987e92d07d 100644 (file)
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -1076,6 +1076,10 @@ optimizations.extend([
 
    (('bcsel', ('ine', a, -1), ('ifind_msb', a), -1), ('ifind_msb', a)),
 
+   (('fmin3@64', a, b, c), ('fmin@64', a, ('fmin@64', b, c))),
+   (('fmax3@64', a, b, c), ('fmax@64', a, ('fmax@64', b, c))),
+   (('fmed3@64', a, b, c), ('fmax@64', ('fmin@64', ('fmax@64', a, b), c), ('fmin@64', a, b))),
+
    # Misc. lowering
    (('fmod', a, b), ('fsub', a, ('fmul', b, ('ffloor', ('fdiv', a, b)))), 'options->lower_fmod'),
    (('frem', a, b), ('fsub', a, ('fmul', b, ('ftrunc', ('fdiv', a, b)))), 'options->lower_fmod'),