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radv: Convert instance bvh address to node in bvh build.

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So we don't have to do it in the traversal loop. Should 2 and
instructions and a 64-bit shift, so 4/8 cycles per instance node
visit.

Totals from 7 (0.01% of 134913) affected shaders:

CodeSize: 208460 -> 208292 (-0.08%)
Instrs: 38276 -> 38248 (-0.07%)
Latency: 803181 -> 803142 (-0.00%)
InvThroughput: 165384 -> 165376 (-0.00%)
Copies: 4912 -> 4905 (-0.14%)
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19706>
This commit is contained in:
Bas Nieuwenhuizen
2022-11-13 03:13:55 +01:00
committed by Marge Bot
parent d09ed23b9a
commit 1b5dc33caa
6 changed files with 31 additions and 10 deletions
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4
src/amd/vulkan/radv_rt_common.c
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@@ -666,9 +666,7 @@ radv_build_ray_traversal(struct radv_device *device, nir_builder *b,
nir_store_deref(b, args->vars.top_stack, nir_load_deref(b, args->vars.stack), 1);
nir_store_deref(b, args->vars.bvh_base,
build_addr_to_node(
b, nir_pack_64_2x32(b, nir_channels(b, instance_data, 0x3))),
1);
nir_pack_64_2x32(b, nir_channels(b, instance_data, 0x3)), 1);
/* Push the instance root node onto the stack */
nir_store_deref(b, args->vars.current_node, nir_imm_int(b, RADV_BVH_ROOT_NODE),