Just don't emit the transform array at all if there are no transforms
for a state, and avoid trying to walk over it.
Original patch by Connor Abbott. Updated with suggestions by
Dylan Baker.
---
src/compiler/nir/nir_algebraic.py | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/src/compiler/nir/nir_algebraic.py
b/src/compiler/nir/nir_algebraic.py
index 6db749e..da5e39c 100644
--- a/src/compiler/nir/nir_algebraic.py
+++ b/src/compiler/nir/nir_algebraic.py
@@ -993,11 +993,13 @@ static const uint16_t CONST_STATE = 1;
% endfor
% for state_id, state_xforms in enumerate(automaton.state_patterns):
+% if state_xforms: # avoid emitting a 0-length array for MSVC
static const struct transform ${pass_name}_state${state_id}_xforms[] = {
% for i in state_xforms:
{ ${xforms[i].search.c_ptr(cache)}, ${xforms[i].replace.c_value_ptr(cache)},
${xforms[i].condition_index} },
% endfor
};
+% endif
% endfor
static const struct per_op_table ${pass_name}_table[nir_num_search_ops] = {
@@ -1080,7 +1082,8 @@ ${pass_name}_block(nir_builder *build, nir_block *block,
switch (states[alu->dest.dest.ssa.index]) {
% for i in range(len(automaton.state_patterns)):
case ${i}:
- for (unsigned i = 0; i < ARRAY_SIZE(${pass_name}_state${i}_xforms);
i++) {
+ % if automaton.state_patterns[i]:
+ for (unsigned i = 0; i < ${len(automaton.state_patterns[i])}; i++) {
const struct transform *xform = &${pass_name}_state${i}_xforms[i];
if (condition_flags[xform->condition_offset] &&
nir_replace_instr(build, alu, xform->search, xform->replace)) {
@@ -1088,6 +1091,7 @@ ${pass_name}_block(nir_builder *build, nir_block *block,
break;
}
}
+ % endif
break;
% endfor
default: assert(0);
--
2.7.4
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