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nir: Handle fp16 rounding modes at nir_type_conversion_op

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nir_type_conversion enables new operations to handle rounding modes to
convert to fp16 values. Two new opcodes are enabled nir_op_f2f16_rtne
and nir_op_f2f16_rtz.

The undefined behaviour doesn't has any effect and uses the original
nir_op_f2f16 operation.

v2: Indentation fixed (Jason Ekstrand)

v3: Use explicit case for undefined rounding and assert if
    rounding mode is used for non 16-bit float conversions
    (Jason Ekstrand)

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Jose Maria Casanova Crespo
2017-07-01 07:58:26 +02:00
parent 2af63683bc
commit 1f440d00d2
5 changed files with 28 additions and 6 deletions
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src/compiler/nir/nir_opcodes_c.py
+14 -1
View File
@@ -30,7 +30,7 @@ template = Template("""
#include "nir.h"
nir_op
nir_type_conversion_op(nir_alu_type src, nir_alu_type dst)
nir_type_conversion_op(nir_alu_type src, nir_alu_type dst, nir_rounding_mode rnd)
{
nir_alu_type src_base = (nir_alu_type) nir_alu_type_get_base_type(src);
nir_alu_type dst_base = (nir_alu_type) nir_alu_type_get_base_type(dst);
@@ -64,7 +64,20 @@ nir_type_conversion_op(nir_alu_type src, nir_alu_type dst)
switch (dst_bit_size) {
% for dst_bits in [16, 32, 64]:
case ${dst_bits}:
% if src_t == 'float' and dst_t == 'float' and dst_bits == 16:
switch(rnd) {
% for rnd_t in ['rtne', 'rtz', 'undef']:
case nir_rounding_mode_${rnd_t}:
return ${'nir_op_{0}2{1}{2}_{3}'.format(src_t[0], dst_t[0],
dst_bits, rnd_t)};
% endfor
default:
unreachable("Invalid 16-bit nir rounding mode");
}
% else:
assert(rnd == nir_rounding_mode_undef);
return ${'nir_op_{0}2{1}{2}'.format(src_t[0], dst_t[0], dst_bits)};
% endif
% endfor
default:
unreachable("Invalid nir alu bit size");