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anv/apply_dynamic_offsets: Use rewrite_src instead of a regular assignment

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Originally we removed the instruction, changed the source, and then
re-inserted it.  This works, but nir_instr_rewrite_src is a bit more
obviously correct.
This commit is contained in:
Jason Ekstrand
2016-05-14 14:53:11 -07:00
parent c29ffea6d1
commit 23090b51e0
1 changed files with 5 additions and 4 deletions
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9
src/intel/vulkan/anv_nir_apply_dynamic_offsets.c
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@@ -81,18 +81,19 @@ apply_dynamic_offsets_block(nir_block *block, nir_builder *b,
nir_builder_instr_insert(b, &offset_load->instr);
nir_src *offset_src = nir_get_io_offset_src(intrin);
nir_ssa_def *new_offset = nir_iadd(b, offset_src->ssa,
&offset_load->dest.ssa);
nir_ssa_def *old_offset = nir_ssa_for_src(b, *offset_src, 1);
nir_ssa_def *new_offset = nir_iadd(b, old_offset, &offset_load->dest.ssa);
nir_instr_rewrite_src(&intrin->instr, offset_src,
nir_src_for_ssa(new_offset));
/* In order to avoid out-of-bounds access, we predicate */
nir_ssa_def *pred = nir_uge(b, nir_channel(b, &offset_load->dest.ssa, 1),
offset_src->ssa);
old_offset);
nir_if *if_stmt = nir_if_create(b->shader);
if_stmt->condition = nir_src_for_ssa(pred);
nir_cf_node_insert(b->cursor, &if_stmt->cf_node);
nir_instr_remove(&intrin->instr);
*offset_src = nir_src_for_ssa(new_offset);
nir_instr_insert_after_cf_list(&if_stmt->then_list, &intrin->instr);
if (intrin->intrinsic != nir_intrinsic_store_ssbo) {