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authorRob Clark <[email protected]>2018-01-19 16:13:09 -0500
committerRob Clark <[email protected]>2018-02-10 14:54:58 -0500
commitec8bc54ad2ce4e05ff8e3679672a616b1984be80 (patch)
treec0098b7ae77c386c4be80acaeb08ef266b5a087e /src/gallium
parenta7ea2b4eba003440e82626f025f783c8f250bd30 (diff)
freedreno/ir3: use peephole select pass
Agressively lowering all if/else to selects in some extreme cases results in much higher register pressure. Using peephole select instead with a modest threshold speeds up alu2 4x! 16 seems like a good limit, low enough to help alu2 but not too low that it penalizes everything else. With a bit better scheduling of the instruction that moves a value into a predicate register, we might be able to lower this limit a bit more in the future, but since we need 6 cycles from the move to predicate register to predicated branch, that puts some sort of lower bound on how far we can lower this threshold. Signed-off-by: Rob Clark <[email protected]>
Diffstat (limited to 'src/gallium')
-rw-r--r--src/gallium/drivers/freedreno/ir3/ir3_nir.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/gallium/drivers/freedreno/ir3/ir3_nir.c b/src/gallium/drivers/freedreno/ir3/ir3_nir.c
index 81a46be914e..e76b39b2304 100644
--- a/src/gallium/drivers/freedreno/ir3/ir3_nir.c
+++ b/src/gallium/drivers/freedreno/ir3/ir3_nir.c
@@ -97,7 +97,7 @@ ir3_optimize_loop(nir_shader *s)
progress |= OPT(s, nir_copy_prop);
progress |= OPT(s, nir_opt_dce);
progress |= OPT(s, nir_opt_cse);
- progress |= OPT(s, ir3_nir_lower_if_else);
+ progress |= OPT(s, nir_opt_peephole_select, 16);
progress |= OPT(s, nir_opt_algebraic);
progress |= OPT(s, nir_opt_constant_folding);