OpenHarmony/third_party_mesa3d
2
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

i965: Enable nir_opt_idiv_const for 32 and 64-bit integers

Browse Source 
The pass should work for all bit sizes but it's less clear that the
extra instructions are worth it on small integers.  Also, the hardware
doesn't do mul_high on anything other than 32-bit integers and, absent
any decent mechanism for testing the pass on 8 and 16-bit types, it's
probably best to just leave it disabled for now.

Shader-db results on Sky Lake:

    total instructions in shared programs: 15105795 -> 15111403 (0.04%)
    instructions in affected programs: 72774 -> 78382 (7.71%)
    helped: 0
    HURT: 265

Note that hurt here actually means helped because we're getting rid of
integer quotient operations (which are a send on some platforms!) and
replacing them with fairly cheap ALU ops.

Reviewed-by: Ian Romanick ian.d.romanick@intel.com
This commit is contained in:
Jason Ekstrand
2017-12-28 19:53:36 -08:00
committed by Jason Ekstrand
parent 455ec7327d
commit 9ebc00f32e
1 changed files with 3 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
src/intel/compiler/brw_nir.c
View File

@@ -570,6 +570,7 @@ brw_nir_optimize(nir_shader *nir, const struct brw_compiler *compiler,
OPT(nir_opt_cse); OPT(nir_opt_cse);
OPT(nir_opt_peephole_select, 0); OPT(nir_opt_peephole_select, 0);
OPT(nir_opt_intrinsics); OPT(nir_opt_intrinsics);
OPT(nir_opt_idiv_const, 32);
OPT(nir_opt_algebraic); OPT(nir_opt_algebraic);
OPT(nir_opt_constant_folding); OPT(nir_opt_constant_folding);
OPT(nir_opt_dead_cf); OPT(nir_opt_dead_cf);
@@ -679,7 +680,8 @@ brw_preprocess_nir(const struct brw_compiler *compiler, nir_shader *nir)
*/ */
OPT(nir_lower_int64, nir_lower_imul64 | OPT(nir_lower_int64, nir_lower_imul64 |
nir_lower_isign64 | nir_lower_isign64 |
nir_lower_divmod64); nir_lower_divmod64 |
nir_lower_imul_high64);
nir = brw_nir_optimize(nir, compiler, is_scalar, true); nir = brw_nir_optimize(nir, compiler, is_scalar, true);