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nir/algebraic: Add lowering for 64-bit hadd and rhadd

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v2: Rebase on 272e927d0e ("nir/spirv: initial handling of OpenCL.std
extension opcodes")

v3: Add a new lower_hadd64 flag that only applies to the 64-bit versions
of the instructions.

v4: Also enable the lowering when nir_lower_iadd64 is set.

Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com> [v3]
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/767>
This commit is contained in:
Ian Romanick 2018-09-19 01:17:09 -07:00 • committed by Marge Bot
parent ea435560ee
commit a483771045
2 changed files with 26 additions and 0 deletions
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21
src/compiler/nir/nir.h
View file

@ -2829,7 +2829,28 @@ typedef struct nir_shader_compiler_options {
/* Set if nir_lower_wpos_ytransform() should also invert gl_PointCoord. */
bool lower_wpos_pntc;
/**
* Set if nir_op_[iu]hadd and nir_op_[iu]rhadd instructions should be
* lowered to simple arithmetic.
*
* If this flag is set, the lowering will be applied to all bit-sizes of
* these instructions.
*
* \sa ::lower_hadd64
*/
bool lower_hadd;
/**
* Set if only 64-bit nir_op_[iu]hadd and nir_op_[iu]rhadd instructions
* should be lowered to simple arithmetic.
*
* If this flag is set, the lowering will be applied to only 64-bit
* versions of these instructions.
*
* \sa ::lower_hadd
*/
bool lower_hadd64;
bool lower_add_sat;
/**

5
src/compiler/nir/nir_opt_algebraic.py
View file

@ -1003,6 +1003,11 @@ optimizations.extend([
(('uhadd', a, b), ('iadd', ('iand', a, b), ('ushr', ('ixor', a, b), 1)), 'options->lower_hadd'),
(('irhadd', a, b), ('isub', ('ior', a, b), ('ishr', ('ixor', a, b), 1)), 'options->lower_hadd'),
(('urhadd', a, b), ('isub', ('ior', a, b), ('ushr', ('ixor', a, b), 1)), 'options->lower_hadd'),
(('ihadd@64', a, b), ('iadd', ('iand', a, b), ('ishr', ('ixor', a, b), 1)), 'options->lower_hadd64 || (options->lower_int64_options & nir_lower_iadd64) != 0'),
(('uhadd@64', a, b), ('iadd', ('iand', a, b), ('ushr', ('ixor', a, b), 1)), 'options->lower_hadd64 || (options->lower_int64_options & nir_lower_iadd64) != 0'),
(('irhadd@64', a, b), ('isub', ('ior', a, b), ('ishr', ('ixor', a, b), 1)), 'options->lower_hadd64 || (options->lower_int64_options & nir_lower_iadd64) != 0'),
(('urhadd@64', a, b), ('isub', ('ior', a, b), ('ushr', ('ixor', a, b), 1)), 'options->lower_hadd64 || (options->lower_int64_options & nir_lower_iadd64) != 0'),
(('uadd_sat', a, b), ('bcsel', ('ult', ('iadd', a, b), a), -1, ('iadd', a, b)), 'options->lower_add_sat'),
(('usub_sat', a, b), ('bcsel', ('ult', a, b), 0, ('isub', a, b)), 'options->lower_add_sat'),