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nir/sink,nir/move: move/sink nir_op_mov

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Can uncover opportunities to move other instructions. This can increase
register usage, but that doesn't seem to actually happen.

This optimizes a pattern of a load_per_vertex_input followed by several
moves and then a store_output in a different block.

v2: add nir_move_copies to make it optional

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Acked-by: Jason Ekstrand <jason@jlekstrand.net> (v1)
Acked-by: Rob Clark <robdclark@chromium.org>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/2420>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/2420>
This commit is contained in:
Rhys Perry
2019-10-14 17:15:04 +01:00
committed by Marge Bot
parent 04fac72ec7
commit d8e05edbd9
2 changed files with 6 additions and 0 deletions
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1
src/compiler/nir/nir.h
View File

@@ -4217,6 +4217,7 @@ typedef enum {
nir_move_load_ubo = (1 << 1),
nir_move_load_input = (1 << 2),
nir_move_comparisons = (1 << 3),
nir_move_copies = (1 << 4),
} nir_move_options;
bool nir_can_move_instr(nir_instr *instr, nir_move_options options);

5
src/compiler/nir/nir_opt_sink.c
View File

@@ -59,6 +59,11 @@ nir_can_move_instr(nir_instr *instr, nir_move_options options)
return true;
}
if ((options & nir_move_copies) && instr->type == nir_instr_type_alu &&
nir_instr_as_alu(instr)->op == nir_op_mov) {
return true;
}
if ((options & nir_move_comparisons) && instr->type == nir_instr_type_alu &&
nir_alu_instr_is_comparison(nir_instr_as_alu(instr))) {
return true;