radeonsi: don't crash if input_usage_mask is 0 for a VS input
This will start happening with the lowered IO intrinstics and new scanning code. Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com> Reviewed-by: Connor Abbott <cwabbott0@gmail.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6445>
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@ -132,8 +132,14 @@ static void load_input_vs(struct si_shader_context *ctx, unsigned input_index, L
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return;
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}
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/* Do multiple loads for special formats. */
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unsigned required_channels = util_last_bit(info->input_usage_mask[input_index]);
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if (required_channels == 0) {
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for (unsigned i = 0; i < 4; ++i)
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out[i] = LLVMGetUndef(ctx->ac.f32);
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return;
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}
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/* Do multiple loads for special formats. */
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LLVMValueRef fetches[4];
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unsigned num_fetches;
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unsigned fetch_stride;
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