From 4eeb49ea71e47899f5d9a51b8f3e1fd9762fa7ad Mon Sep 17 00:00:00 2001 From: =?utf8?q?Daniel=20Sch=C3=BCrmann?= Date: Fri, 25 Jan 2019 13:56:49 +0100 Subject: [PATCH] nir/algebraic: Remove unnecessary iand of [iu]bfe and bfm sources The [iu]bfe and bfm instructions are defined to only use the five least significant bits. This optimizes a common pattern from D3D -> SPIR-V translation. Reviewed-by: Connor Abbott --- src/compiler/nir/nir_opt_algebraic.py | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py index c7e69c0..6e660df 100644 --- a/src/compiler/nir/nir_opt_algebraic.py +++ b/src/compiler/nir/nir_opt_algebraic.py @@ -809,6 +809,14 @@ optimizations.extend([ ('ubfe', 'value', 'offset', 'bits')), 'options->lower_bitfield_extract'), + # Note that these opcodes are defined to only use the five least significant bits of 'offset' and 'bits' + (('ubfe', 'value', 'offset', ('iand', 31, 'bits')), ('ubfe', 'value', 'offset', 'bits')), + (('ubfe', 'value', ('iand', 31, 'offset'), 'bits'), ('ubfe', 'value', 'offset', 'bits')), + (('ibfe', 'value', 'offset', ('iand', 31, 'bits')), ('ibfe', 'value', 'offset', 'bits')), + (('ibfe', 'value', ('iand', 31, 'offset'), 'bits'), ('ibfe', 'value', 'offset', 'bits')), + (('bfm', 'bits', ('iand', 31, 'offset')), ('bfm', 'bits', 'offset')), + (('bfm', ('iand', 31, 'bits'), 'offset'), ('bfm', 'bits', 'offset')), + (('ibitfield_extract', 'value', 'offset', 'bits'), ('bcsel', ('ieq', 0, 'bits'), 0, -- 2.7.4