[Mesa-dev] [PATCH v2 09/18] intel/compiler: lower some 16-bit integer operations to 32-bit
Iago Toral Quiroga
itoral at igalia.com
Mon Apr 30 14:18:17 UTC 2018
These are not supported in hardware for 16-bit integers.
We do the lowering pass after the optimization loop to ensure that we
lower ALU operations injected by algebraic optimizations too.
---
src/intel/compiler/brw_nir.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/src/intel/compiler/brw_nir.c b/src/intel/compiler/brw_nir.c
index 16b0d86814..fb5e08fb33 100644
--- a/src/intel/compiler/brw_nir.c
+++ b/src/intel/compiler/brw_nir.c
@@ -590,6 +590,25 @@ brw_nir_optimize(nir_shader *nir, const struct brw_compiler *compiler,
return nir;
}
+static unsigned
+lower_bit_size_callback(const nir_alu_instr *alu, void *data)
+{
+ assert(alu->dest.dest.is_ssa);
+ if (alu->dest.dest.ssa.bit_size != 16)
+ return 0;
+
+ switch (alu->op) {
+ case nir_op_idiv:
+ case nir_op_imod:
+ case nir_op_irem:
+ case nir_op_udiv:
+ case nir_op_umod:
+ return 32;
+ default:
+ return 0;
+ }
+}
+
/* Does some simple lowering and runs the standard suite of optimizations
*
* This is intended to be called more-or-less directly after you get the
@@ -643,6 +662,8 @@ brw_preprocess_nir(const struct brw_compiler *compiler, nir_shader *nir)
nir = brw_nir_optimize(nir, compiler, is_scalar);
+ nir_lower_bit_size(nir, lower_bit_size_callback, NULL);
+
if (is_scalar) {
OPT(nir_lower_load_const_to_scalar);
}
--
2.14.1
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