diff options
author | Iago Toral Quiroga <[email protected]> | 2018-05-24 09:54:45 +0200 |
---|---|---|
committer | Juan A. Suarez Romero <[email protected]> | 2019-03-25 16:08:25 +0100 |
commit | 763c8aabed3e03a67b6c7ba1388aa72f5b6044e4 (patch) | |
tree | 6b1410bff50069d40484e971e1449a8ba1acfe3f /src/compiler/nir | |
parent | 3766334923e9180c5ed98a97808dda1a2665332d (diff) |
compiler/nir: add lowering for 16-bit ldexp
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 <[email protected]>
Reviewed-by: Jason Ekstrand <[email protected]>
Diffstat (limited to 'src/compiler/nir')
-rw-r--r-- | src/compiler/nir/nir_opt_algebraic.py | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py index 78e273d0e64..5f6ae5eeccc 100644 --- a/src/compiler/nir/nir_opt_algebraic.py +++ b/src/compiler/nir/nir_opt_algebraic.py @@ -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'), ] |