On 23/11/18 11:49 am, Timothy Arceri wrote:
shader-db results radeonsi (VEGA):
Totals from affected shaders:
SGPRS: 7272 -> 7488 (2.97 %)
VGPRS: 4168 -> 4160 (-0.19 %)
Spilled SGPRs: 328 -> 327 (-0.30 %)
Spilled VGPRs: 0 -> 0 (0.00 %)
Private memory VGPRs: 0 -> 0 (0.00 %)
Scratch size: 0 -> 0 (0.00 %) dwords per thread
Code Size: 268212 -> 268656 (0.17 %) bytes
LDS: 0 -> 0 (0.00 %) blocks
Max Waves: 452 -> 452 (0.00 %)
Wait states: 0 -> 0 (0.00 %)
vkpipeline-db results RADV (VEGA):
Totals from affected shaders:
SGPRS: 160 -> 160 (0.00 %)
VGPRS: 88 -> 88 (0.00 %)
Spilled SGPRs: 0 -> 0 (0.00 %)
Spilled VGPRs: 0 -> 0 (0.00 %)
Private memory VGPRs: 0 -> 0 (0.00 %)
Scratch size: 0 -> 0 (0.00 %) dwords per thread
Code Size: 18268 -> 18152 (-0.63 %) bytes
LDS: 0 -> 0 (0.00 %) blocks
Max Waves: 26 -> 26 (0.00 %)
Wait states: 0 -> 0 (0.00 %)
---
src/compiler/nir/nir_opt_if.c | 60 +++++++++++++++++++++++++++++++++++
1 file changed, 60 insertions(+)
diff --git a/src/compiler/nir/nir_opt_if.c b/src/compiler/nir/nir_opt_if.c
index 8a971c43f2..b1b99b4e40 100644
--- a/src/compiler/nir/nir_opt_if.c
+++ b/src/compiler/nir/nir_opt_if.c
@@ -574,6 +574,65 @@ opt_if_evaluate_condition_use(nir_builder *b, nir_if *nif)
return progress;
}
+/* Perform optimisations based on the values we can derive from the evaluation
+ * of if-statement conditions.
+ */
+static bool
+opt_for_known_values(nir_builder *b, nir_if *nif)
+{
+ bool progress = false;
+
+ assert(nif->condition.is_ssa);
+ nir_ssa_def *if_cond = nif->condition.ssa;
+
+ if (if_cond->parent_instr->type != nir_instr_type_alu)
+ return false;
+
+ nir_alu_instr *alu = nir_instr_as_alu(if_cond->parent_instr);
+ switch (alu->op) {
+ case nir_op_feq:
+ case nir_op_ieq: {
+ nir_load_const_instr *load_const = NULL;
+ nir_ssa_def *unknown_val = NULL;
+
+ nir_ssa_def *src0 = alu->src[0].src.ssa;
+ nir_ssa_def *src1 = alu->src[1].src.ssa;
+ if (src0a->parent_instr->type == nir_instr_type_load_const) {
^--- Whoops this is fixed locally
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