anv: get rid of ilog2_round_up

__builtin_clz(value - 1) is undefined for with value=1 (because
__builtin_clz(0) is undefined).

Because we set rt_pipeline->stack_size = 1 when a ray tracing pipeline
doesn't need any stack allocation to differentiate from a dynamic size
(rt_pipeline->stack_size = 0) we can run into this undefinied behavior
issue.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Fixes: f68d64dac015 ("anv: Add support for vkCmdSetRayTracingPipelineStackSizeKHR")
Reviewed-by: Marcin Ślusarz <marcin.slusarz@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19781>
(cherry picked from commit 440da44a84022ec63e87e2c5a55ad03a244697a4)

3 files changed, 7 insertions, 27 deletions

diff --git a/.pick_status.json b/.pick_status.json
index 789b6ea4159..0c2032d79d9 100644
--- a/.pick_status.json
+++ b/.pick_status.json
@@ -2677,7 +2677,7 @@
         "description": "anv: get rid of ilog2_round_up",
         "nominated": true,
         "nomination_type": 1,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": "f68d64dac01505560a53aabe2b8616685cace0c2"
     },
diff --git a/src/intel/vulkan/anv_allocator.c b/src/intel/vulkan/anv_allocator.c
index 57c554d63b1..12f502f40be 100644
--- a/src/intel/vulkan/anv_allocator.c
+++ b/src/intel/vulkan/anv_allocator.c
@@ -113,19 +113,6 @@
 #define PAGE_SIZE 4096
 #endif
 
-static inline uint32_t
-ilog2_round_up(uint32_t value)
-{
-   assert(value != 0);
-   return 32 - __builtin_clz(value - 1);
-}
-
-static inline uint32_t
-round_to_power_of_two(uint32_t value)
-{
-   return 1 << ilog2_round_up(value);
-}
-
 struct anv_state_table_cleanup {
    void *map;
    size_t size;
@@ -734,7 +721,7 @@ anv_fixed_size_state_pool_alloc_new(struct anv_fixed_size_state_pool *pool,
 static uint32_t
 anv_state_pool_get_bucket(uint32_t size)
 {
-   unsigned size_log2 = ilog2_round_up(size);
+   unsigned size_log2 = util_logbase2_ceil(size);
    assert(size_log2 <= ANV_MAX_STATE_SIZE_LOG2);
    if (size_log2 < ANV_MIN_STATE_SIZE_LOG2)
       size_log2 = ANV_MIN_STATE_SIZE_LOG2;
@@ -1023,7 +1010,7 @@ anv_state_stream_alloc(struct anv_state_stream *stream,
    if (offset + size > stream->block.alloc_size) {
       uint32_t block_size = stream->block_size;
       if (block_size < size)
-         block_size = round_to_power_of_two(size);
+         block_size = util_next_power_of_two(size);
 
       stream->block = anv_state_pool_alloc_no_vg(stream->state_pool,
                                                  block_size, PAGE_SIZE);
@@ -1143,7 +1130,7 @@ VkResult
 anv_bo_pool_alloc(struct anv_bo_pool *pool, uint32_t size,
                   struct anv_bo **bo_out)
 {
-   const unsigned size_log2 = size < 4096 ? 12 : ilog2_round_up(size);
+   const unsigned size_log2 = size < 4096 ? 12 : util_logbase2_ceil(size);
    const unsigned pow2_size = 1 << size_log2;
    const unsigned bucket = size_log2 - 12;
    assert(bucket < ARRAY_SIZE(pool->free_list));
@@ -1180,7 +1167,7 @@ anv_bo_pool_free(struct anv_bo_pool *pool, struct anv_bo *bo)
    VG(VALGRIND_MEMPOOL_FREE(pool, bo->map));
 
    assert(util_is_power_of_two_or_zero(bo->size));
-   const unsigned size_log2 = ilog2_round_up(bo->size);
+   const unsigned size_log2 = util_logbase2_ceil(bo->size);
    const unsigned bucket = size_log2 - 12;
    assert(bucket < ARRAY_SIZE(pool->free_list));
 
diff --git a/src/intel/vulkan/anv_cmd_buffer.c b/src/intel/vulkan/anv_cmd_buffer.c
index 8a41e0c3cd7..e116ae3746c 100644
--- a/src/intel/vulkan/anv_cmd_buffer.c
+++ b/src/intel/vulkan/anv_cmd_buffer.c
@@ -318,13 +318,6 @@ set_dirty_for_bind_map(struct anv_cmd_buffer *cmd_buffer,
       cmd_buffer->state.push_constants_dirty |= mesa_to_vk_shader_stage(stage);
 }
 
-static inline uint32_t
-ilog2_round_up(uint32_t value)
-{
-   assert(value != 0);
-   return 32 - __builtin_clz(value - 1);
-}
-
 static void
 anv_cmd_buffer_set_ray_query_buffer(struct anv_cmd_buffer *cmd_buffer,
                                     struct anv_cmd_pipeline_state *pipeline_state,
@@ -340,7 +333,7 @@ anv_cmd_buffer_set_ray_query_buffer(struct anv_cmd_buffer *cmd_buffer,
    if (ray_shadow_size > 0 &&
        (!cmd_buffer->state.ray_query_shadow_bo ||
         cmd_buffer->state.ray_query_shadow_bo->size < ray_shadow_size)) {
-      unsigned shadow_size_log2 = MAX2(ilog2_round_up(ray_shadow_size), 16);
+      unsigned shadow_size_log2 = MAX2(util_logbase2_ceil(ray_shadow_size), 16);
       unsigned bucket = shadow_size_log2 - 16;
       assert(bucket < ARRAY_SIZE(device->ray_query_shadow_bos));
 
@@ -1076,7 +1069,7 @@ void anv_CmdSetRayTracingPipelineStackSizeKHR(
 
    uint32_t stack_ids_per_dss = 2048; /* TODO */
 
-   unsigned stack_size_log2 = ilog2_round_up(pipelineStackSize);
+   unsigned stack_size_log2 = util_logbase2_ceil(pipelineStackSize);
    if (stack_size_log2 < 10)
       stack_size_log2 = 10;