[Bug 103241] Anv crashes when using 64-bit vertex inputs

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103241

            Bug ID: 103241
           Summary: Anv crashes when using 64-bit vertex inputs
           Product: Mesa
           Version: git
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Vulkan/intel
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: joseph.kucia at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org
                CC: jason at jlekstrand.net

"elem_count" isn't calculated correctly for 64bit vertex inputs in
emit_vertex_input(). This leads to crash/assert() in the driver code.

The problem is that vs_prog_data->inputs_read may contain only parts of
varyings mark as used (see try_mask_partial_io() in
src/compiler/nir/nir_gather_info.c). On the other hand, for
vs_prog_data->double_inputs_read whole variables are always marked as used. The
element count is computed as _builtin_popcount(elements) -
_builtin_popcount(elements_double) / 2, but popcount(elements_double) / 2 >
popcount(elements) when only portions of double variables are mark as used.     

This can be reproduced using the
VkPositiveLayerTest.CreatePipeline64BitAttributesPositive test from
Vulkan-LoaderAndValidationLayers: 

./vk_layer_validation_tests
--gtest_filter='VkPositiveLayerTest.CreatePipeline64BitAttributesPositive'
Note: Google Test filter =
VkPositiveLayerTest.CreatePipeline64BitAttributesPositive
[==========] Running 1 test from 1 test case.
[----------] Global test environment set-up.
[----------] 1 test from VkPositiveLayerTest
[ RUN      ] VkPositiveLayerTest.CreatePipeline64BitAttributesPositive
vk_layer_validation_tests: ./genxml/gen9_pack.h:66: __gen_uint: Assertion `v <=
max' failed.
Aborted

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