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compiler/nir: add lowering for 16-bit ldexp

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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.pohjolainen@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Iago Toral Quiroga 2018-05-24 09:54:45 +02:00 • committed by Juan A. Suarez Romero
parent 3766334923
commit 763c8aabed
1 changed files with 7 additions and 2 deletions
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9
src/compiler/nir/nir_opt_algebraic.py
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@ -851,7 +851,9 @@ 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))
@ -869,7 +871,9 @@ 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)
@ -889,6 +893,7 @@ 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'),
]