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nir: Turn imov/fmov of undef into undef

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Reverting the previous attempt at this a5502a721f resulted in
the following Vulkan test failing.

dEQP-VK.glsl.return.return_in_dynamic_loop_dynamic_vertex

This time we use the num_components from the alu dest rather than
num_inputs to the op to determine the size of the undef.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Cc: "13.0" <mesa-stable@lists.freedesktop.org>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=99100
This commit is contained in:
Timothy Arceri 2016-12-16 10:17:33 +11:00
parent 08fc74663b
commit 3421b3f5a3
1 changed files with 6 additions and 6 deletions
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12
src/compiler/nir/nir_opt_undef.c
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@ -79,22 +79,22 @@ opt_undef_vecN(nir_builder *b, nir_alu_instr *alu)
{
if (alu->op != nir_op_vec2 &&
alu->op != nir_op_vec3 &&
alu->op != nir_op_vec4)
alu->op != nir_op_vec4 &&
alu->op != nir_op_fmov &&
alu->op != nir_op_imov)
return false;
assert(alu->dest.dest.is_ssa);
unsigned num_components = nir_op_infos[alu->op].num_inputs;
for (unsigned i = 0; i < num_components; i++) {
for (unsigned i = 0; i < nir_op_infos[alu->op].num_inputs; i++) {
if (!alu->src[i].src.is_ssa ||
alu->src[i].src.ssa->parent_instr->type != nir_instr_type_ssa_undef)
return false;
}
b->cursor = nir_before_instr(&alu->instr);
nir_ssa_def *undef =
nir_ssa_undef(b, num_components, nir_dest_bit_size(alu->dest.dest));
nir_ssa_def *undef = nir_ssa_undef(b, alu->dest.dest.ssa.num_components,
nir_dest_bit_size(alu->dest.dest));
nir_ssa_def_rewrite_uses(&alu->dest.dest.ssa, nir_src_for_ssa(undef));
return true;