nir: define behavior of nir_op_bfm and nir_op_u/ibfe according to SM5 spec.

[mesa.git] / src / compiler / nir / nir_opt_algebraic.py

diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py
index 36e576b7eff89edd84ce9716b13944440539716c..c7e69c0310c23084289ad4011f5cc79ce727a251 100644 (file)
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -794,18 +794,11 @@ optimizations.extend([
 
    # Alternative lowering that doesn't rely on bfi.
    (('bitfield_insert', 'base', 'insert', 'offset', 'bits'),
-    ('bcsel', ('ilt', 31, 'bits'),
-     'insert',
-     ('ior',
-      ('iand', 'base', ('inot', ('bfm', 'bits', 'offset'))),
-      ('iand', ('ishl', 'insert', 'offset'), ('bfm', 'bits', 'offset')))),
+    ('ior',
+    ('iand', 'base', ('inot', ('ishl', ('isub', ('ishl', 1, 'bits'), 1), 'offset'))),
+    ('iand', ('ishl', 'insert', 'offset'), ('ishl', ('isub', ('ishl', 1, 'bits'), 1), 'offset'))),
     'options->lower_bitfield_insert_to_shifts'),
 
-   # bfm lowering -- note that the NIR opcode is undefined if either arg is 32.
-   (('bfm', 'bits', 'offset'),
-    ('ishl', ('isub', ('ishl', 1, 'bits'), 1), 'offset'),
-    'options->lower_bfm'),
-
    (('ibitfield_extract', 'value', 'offset', 'bits'),
     ('bcsel', ('ilt', 31, 'bits'), 'value',
               ('ibfe', 'value', 'offset', 'bits')),
@@ -829,7 +822,7 @@ optimizations.extend([
      ('ushr', 'value', 'offset'),
      ('bcsel', ('ieq', 'bits', 32),
       0xffffffff,
-      ('bfm', 'bits', 0))),
+      ('isub', ('ishl', 1, 'bits'), 1))),
     'options->lower_bitfield_extract_to_shifts'),
 
    (('ifind_msb', 'value'),