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anv: Use different logic to isolate lowest flag in anv_foreach_vk_stage

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Silences many ubsan errors like:

src/intel/vulkan/anv_shader_compile.c:609:4: runtime error: shift exponent -1 is negative

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/40230>
This commit is contained in:
Ian Romanick 2026-03-03 14:07:52 -08:00 • committed by Marge Bot
parent ea731cda12
commit 4cbf2ee3f0
1 changed files with 2 additions and 1 deletions
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3
src/intel/vulkan/anv_private.h
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@ -5304,7 +5304,8 @@ struct anv_event {
#define anv_foreach_vk_stage(stage, stage_bits) \
for (VkShaderStageFlags stage, \
__tmp = (stage_bits & ANV_VK_STAGE_MASK); \
stage = BITFIELD_BIT(__builtin_ffs(__tmp) - 1), __tmp; \
/* See util_bitcount in bitscan.h. */ \
stage = __tmp & -__tmp, __tmp; \
__tmp &= ~(stage))
struct anv_shader_upload_params {