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nir/constant_expressions: mind rounding mode converting from float to float16 destinations

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v2:
- Move the op-code specific knowledge to nir_opcodes.py even if it
  means a rount trip conversion (Connor).

Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Signed-off-by: Andres Gomez <agomez@igalia.com>
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
This commit is contained in:
Samuel Iglesias Gonsálvez 2019-02-04 15:10:35 +01:00 • committed by Andres Gomez
parent ef681cf971
commit 5e22f3e29a
1 changed files with 10 additions and 2 deletions
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12
src/compiler/nir/nir_constant_expressions.py
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@ -364,7 +364,11 @@ struct ${type}${width}_vec {
## Sanitize the C value to a proper NIR 0/-1 bool
_dst_val[_i].${get_const_field(output_type)} = -(int)dst;
% elif output_type == "float16":
_dst_val[_i].u16 = _mesa_float_to_half(dst);
if (nir_is_rounding_mode_rtz(execution_mode, 16)) {
_dst_val[_i].u16 = _mesa_float_to_float16_rtz(dst);
} else {
_dst_val[_i].u16 = _mesa_float_to_float16_rtne(dst);
}
% else:
_dst_val[_i].${get_const_field(output_type)} = dst;
% endif
@ -408,7 +412,11 @@ struct ${type}${width}_vec {
## Sanitize the C value to a proper NIR 0/-1 bool
_dst_val[${k}].${get_const_field(output_type)} = -(int)dst.${"xyzw"[k]};
% elif output_type == "float16":
_dst_val[${k}].u16 = _mesa_float_to_half(dst.${"xyzw"[k]});
if (nir_is_rounding_mode_rtz(execution_mode, 16)) {
_dst_val[${k}].u16 = _mesa_float_to_float16_rtz(dst.${"xyzw"[k]});
} else {
_dst_val[${k}].u16 = _mesa_float_to_float16_rtne(dst.${"xyzw"[k]});
}
% else:
_dst_val[${k}].${get_const_field(output_type)} = dst.${"xyzw"[k]};
% endif