Unfortunately some int64 lowerings generate more int64 operations, so we
need to call this function a few times. Also call
nir_lower_alu_to_scalar() beforehand to make more int64 operations
available for lowering.
---
src/intel/compiler/brw_nir.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/src/intel/compiler/brw_nir.c b/src/intel/compiler/brw_nir.c
index f61baee230a..066724c58a6 100644
--- a/src/intel/compiler/brw_nir.c
+++ b/src/intel/compiler/brw_nir.c
@@ -670,12 +670,16 @@ brw_preprocess_nir(const struct brw_compiler *compiler,
nir_shader *nir)
*/
OPT(nir_opt_algebraic);
+ if (is_scalar) {
+ OPT(nir_lower_alu_to_scalar);
+ }
+
/* Lower int64 instructions before nir_optimize so that loop unrolling
* sees their actual cost.
*/
- nir_lower_int64(nir, nir_lower_imul64 |
- nir_lower_isign64 |
- nir_lower_divmod64);
+ while (nir_lower_int64(nir, nir_lower_imul64 |
+ nir_lower_isign64 |
+ nir_lower_divmod64));
nir = brw_nir_optimize(nir, compiler, is_scalar, true);
--
2.16.4
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