Mesa (master): nir/divergence: improve DA of shuffle
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Tue Nov 12 17:59:15 UTC 2019
Module: Mesa
Branch: master
Commit: c877f4d320b431f64634b8cda057311ea17c9a26
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=c877f4d320b431f64634b8cda057311ea17c9a26
Author: Rhys Perry <pendingchaos02 at gmail.com>
Date: Tue Nov 12 15:29:45 2019 +0000
nir/divergence: improve DA of shuffle
If the data is uniform, then it's really a uniform copy. If the index is
uniform, then it's really a read_invocation.
Signed-off-by: Rhys Perry <pendingchaos02 at gmail.com>
Reviewed-by: Daniel Schürmann <daniel at schuermann.dev>
---
src/compiler/nir/nir_divergence_analysis.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/src/compiler/nir/nir_divergence_analysis.c b/src/compiler/nir/nir_divergence_analysis.c
index 301d7a4820b..9b8f9cb6349 100644
--- a/src/compiler/nir/nir_divergence_analysis.c
+++ b/src/compiler/nir/nir_divergence_analysis.c
@@ -200,7 +200,6 @@ visit_intrinsic(bool *divergent, nir_intrinsic_instr *instr,
case nir_intrinsic_ballot_find_lsb:
case nir_intrinsic_ballot_find_msb:
case nir_intrinsic_ballot_bit_count_reduce:
- case nir_intrinsic_shuffle:
case nir_intrinsic_shuffle_xor:
case nir_intrinsic_shuffle_up:
case nir_intrinsic_shuffle_down:
@@ -247,6 +246,11 @@ visit_intrinsic(bool *divergent, nir_intrinsic_instr *instr,
break;
}
+ case nir_intrinsic_shuffle:
+ is_divergent = divergent[instr->src[0].ssa->index] &&
+ divergent[instr->src[1].ssa->index];
+ break;
+
/* Intrinsics which are always divergent */
case nir_intrinsic_load_color0:
case nir_intrinsic_load_color1:
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