Module: Mesa Branch: main Commit: 61c7e1bf48f620cc81b6273cbaf595b7e27d80b7 URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=61c7e1bf48f620cc81b6273cbaf595b7e27d80b7
Author: Alyssa Rosenzweig <[email protected]> Date: Thu Dec 29 18:04:40 2022 -0500 agx: Peephole select after opt_preamble Reduces control flow in Dolphin uber shaders, which saves us a few cycles. Signed-off-by: Alyssa Rosenzweig <[email protected]> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20597> --- src/asahi/compiler/agx_compile.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/src/asahi/compiler/agx_compile.c b/src/asahi/compiler/agx_compile.c index 9c7a41624b4..bd15c59f03b 100644 --- a/src/asahi/compiler/agx_compile.c +++ b/src/asahi/compiler/agx_compile.c @@ -1702,6 +1702,14 @@ agx_optimize_nir(nir_shader *nir, unsigned *preamble_size) NIR_PASS_V(nir, nir_lower_int64); NIR_PASS_V(nir, agx_nir_opt_preamble, preamble_size); + + /* Forming preambles may dramatically reduce the instruction count + * in certain blocks, causing some if-else statements to become + * trivial. We want to peephole select those, given that control flow + * prediction instructions are costly. + */ + NIR_PASS_V(nir, nir_opt_peephole_select, 64, false, true); + NIR_PASS_V(nir, nir_opt_algebraic_late); NIR_PASS_V(nir, nir_opt_constant_folding);
