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intel/fs: Don't copy-propagate stride=0 sources into ddx/ddy

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This can come up if, for instance, the shader does a derivative of a
uniform or flat input.  Ideally, NIR would use divergence analysis to
get rid of the derivative in this case but it doesn't right now.  This
fixes a crash in F1 2017.

Cc: mesa-stable@lists.freedesktop.org
Reported-by: Marcin Ślusarz <marcin.slusarz@intel.com>
Tested-by: Marcin Ślusarz <marcin.slusarz@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6564>
This commit is contained in:
Jason Ekstrand
2020-09-02 10:13:16 -05:00
committed by Marge Bot
parent 95415a54c0
commit 8e8701b43a
1 changed files with 1 additions and 1 deletions
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src/intel/compiler/brw_fs_copy_propagation.cpp
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@@ -524,7 +524,7 @@ fs_visitor::try_copy_propagate(fs_inst *inst, int arg, acp_entry *entry)
*/
const unsigned entry_stride = (entry->src.file == FIXED_GRF ? 1 :
entry->src.stride);
if (instruction_requires_packed_data(inst) && entry_stride > 1)
if (instruction_requires_packed_data(inst) && entry_stride != 1)
return false;
/* Bail if the result of composing both strides would exceed the