v2 (Topi):
- Make bit-size handling order be 16-bit, 32-bit, 64-bit
- Clamp lower exponent range at -28 instead of -30.
Reviewed-by: Topi Pohjolainen <topi.pohjolai...@intel.com>
Reviewed-by: Jason Ekstrand <ja...@jlekstrand.net>
---
src/compiler/nir/nir_opt_algebraic.py | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/src/compiler/nir/nir_opt_algebraic.py
b/src/compiler/nir/nir_opt_algebraic.py
index 882a4864ced..14caad6d836 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -790,7 +790,9 @@ for x, y in itertools.product(['f', 'u', 'i'], ['f', 'u',
'i']):
def fexp2i(exp, bits):
# We assume that exp is already in the right range.
- if bits == 32:
+ if bits == 16:
+ return ('i2i16', ('ishl', ('iadd', exp, 15), 10))
+ elif bits == 32:
return ('ishl', ('iadd', exp, 127), 23)
elif bits == 64:
return ('pack_64_2x32_split', 0, ('ishl', ('iadd', exp, 1023), 20))
@@ -808,7 +810,9 @@ def ldexp(f, exp, bits):
# handles a range on exp of [-252, 254] which allows you to create any
# value (including denorms if the hardware supports it) and to adjust the
# exponent of any normal value to anything you want.
- if bits == 32:
+ if bits == 16:
+ exp = ('imin', ('imax', exp, -28), 30)
+ elif bits == 32:
exp = ('imin', ('imax', exp, -252), 254)
elif bits == 64:
exp = ('imin', ('imax', exp, -2044), 2046)
@@ -828,6 +832,7 @@ def ldexp(f, exp, bits):
return ('fmul', ('fmul', f, pow2_1), pow2_2)
optimizations += [
+ (('ldexp@16', 'x', 'exp'), ldexp('x', 'exp', 16), 'options->lower_ldexp'),
(('ldexp@32', 'x', 'exp'), ldexp('x', 'exp', 32), 'options->lower_ldexp'),
(('ldexp@64', 'x', 'exp'), ldexp('x', 'exp', 64), 'options->lower_ldexp'),
]
--
2.17.1
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