Rhys Perry
65a54b4ec4
If we have NIR such as:
32x4 %48 = @load_vulkan_descriptor (%47) (desc_type=SSBO)
32x4 %76 = deref_cast (tint_symbol_11 *)%48 (ssbo tint_symbol_11) (ptr_stride=0, align_mul=4, align_offset=0)
32x4 %77 = deref_struct &%76->tint_symbol_10 (ssbo int) // &((tint_symbol_11 *)%48)->tint_symbol_10
A single nir_rematerialize_deref_in_use_blocks() will rematerialize the
deref_struct and then it's deref_cast. However,
nir_foreach_instr_reverse_safe is not safe if the next iteration's
instruction is removed. This can result in the instruction loop exiting
and the load_vulkan_descriptor never having an LCSSA phi.
Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Fixes: 439e8c42cc ("nir/lcssa: Fix rematerializing derefs")
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/11770
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32225>
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