Mesa (main): tu/autotune: Prevent division by zero

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Module: Mesa
Branch: main
Commit: 19682028eb0a2143c18ab2a26f3b23b7f74b2335
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=19682028eb0a2143c18ab2a26f3b23b7f74b2335

Author: Danylo Piliaiev <dpiliaiev at igalia.com>
Date:   Fri Jun 10 13:06:19 2022 +0300

tu/autotune: Prevent division by zero

src/freedreno/vulkan/tu_autotune.c:509:48: runtime error: division by zero

Signed-off-by: Danylo Piliaiev <dpiliaiev at igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16967>

---

 src/freedreno/vulkan/tu_autotune.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/freedreno/vulkan/tu_autotune.c b/src/freedreno/vulkan/tu_autotune.c
index 2446cc6a129..80c732ce972 100644
--- a/src/freedreno/vulkan/tu_autotune.c
+++ b/src/freedreno/vulkan/tu_autotune.c
@@ -504,6 +504,9 @@ estimate_drawcall_bandwidth(const struct tu_cmd_buffer *cmd,
 {
    const struct tu_cmd_state *state = &cmd->state;
 
+   if (!state->drawcall_count)
+      return 0;
+
    /* sample count times drawcall_bandwidth_per_sample */
    return (uint64_t)avg_renderpass_sample_count *
       state->drawcall_bandwidth_per_sample_sum / state->drawcall_count;