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nir: remove dead code from copy_prop_vars

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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: 4dfa7adc10 "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>
This commit is contained in:
Caio Marcelo de Oliveira Filho 2018-12-19 15:23:28 -08:00
parent 31e4c9ce40
commit bbf9ee9b18
1 changed files with 1 additions and 1 deletions
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src/compiler/nir/nir_opt_copy_prop_vars.c
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@ -742,9 +742,9 @@ copy_prop_vars_block(struct copy_prop_var_state *state,
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)