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nir/loop_analyze: consider instruction cost of nir_op_flrp

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Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12061>
This commit is contained in:
Daniel Schürmann
2021-07-23 12:15:57 +02:00
committed by Marge Bot
parent 572ed22494
commit 89a842b2b6
1 changed files with 12 additions and 5 deletions
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17
src/compiler/nir/nir_loop_analyze.c
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@@ -151,6 +151,14 @@ instr_cost(nir_instr *instr, const nir_shader_compiler_options *options)
nir_alu_instr *alu = nir_instr_as_alu(instr);
const nir_op_info *info = &nir_op_infos[alu->op];
unsigned cost = 1;
if (alu->op == nir_op_flrp) {
if ((options->lower_flrp16 && nir_dest_bit_size(alu->dest.dest) == 16) ||
(options->lower_flrp32 && nir_dest_bit_size(alu->dest.dest) == 32) ||
(options->lower_flrp64 && nir_dest_bit_size(alu->dest.dest) == 64))
cost *= 3;
}
/* Assume everything 16 or 32-bit is cheap.
*
@@ -159,7 +167,7 @@ instr_cost(nir_instr *instr, const nir_shader_compiler_options *options)
*/
if (nir_dest_bit_size(alu->dest.dest) < 64 &&
nir_src_bit_size(alu->src[0].src) < 64)
return 1;
return cost;
bool is_fp64 = nir_dest_bit_size(alu->dest.dest) == 64 &&
nir_alu_type_get_base_type(info->output_type) == nir_type_float;
@@ -171,7 +179,6 @@ instr_cost(nir_instr *instr, const nir_shader_compiler_options *options)
if (is_fp64) {
/* If it's something lowered normally, it's expensive. */
unsigned cost = 1;
if (options->lower_doubles_options &
nir_lower_doubles_op_to_options_mask(alu->op))
cost *= 20;
@@ -188,13 +195,13 @@ instr_cost(nir_instr *instr, const nir_shader_compiler_options *options)
if (alu->op == nir_op_idiv || alu->op == nir_op_udiv ||
alu->op == nir_op_imod || alu->op == nir_op_umod ||
alu->op == nir_op_irem)
return 100;
return cost * 100;
/* Other int64 lowering isn't usually all that expensive */
return 5;
return cost * 5;
}
return 1;
return cost;
}
}