nir: remove dead code from copy_prop_vars
When copy_prop_vars also took care of dead write handling, intrin was
used as part of store_to_entry. Now it isn't, so this assignment
isn't used really used. Add a comment clarifying what happens to
intrin.
Fixes: 4dfa7adc100 "nir: Remove handling of dead writes from copy_prop_vars"
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
diff --git a/src/compiler/nir/nir_opt_copy_prop_vars.c b/src/compiler/nir/nir_opt_copy_prop_vars.c
index 771f125..e109814 100644
--- a/src/compiler/nir/nir_opt_copy_prop_vars.c
+++ b/src/compiler/nir/nir_opt_copy_prop_vars.c
@@ -742,9 +742,9 @@
lookup_entry_for_deref(copies, src, nir_derefs_a_contains_b_bit);
struct value value;
if (try_load_from_entry(state, src_entry, b, intrin, src, &value)) {
+ /* If load works, intrin (the copy_deref) is removed. */
if (value.is_ssa) {
nir_store_deref(b, dst, value.ssa[0], 0xf);
- intrin = nir_instr_as_intrinsic(nir_builder_last_instr(b));
} else {
/* If this would be a no-op self-copy, don't bother. */
if (nir_compare_derefs(value.deref, dst) & nir_derefs_equal_bit)