Mesa (master): radeonsi: don't crash if input_usage_mask is 0 for a VS input

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Module: Mesa
Branch: master
Commit: 0464ee7f9d9383175c31192500ee9e6d9f01fe60
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=0464ee7f9d9383175c31192500ee9e6d9f01fe60

Author: Marek Olšák <marek.olsak at amd.com>
Date:   Thu Aug 13 22:12:12 2020 -0400

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 at amd.com>
Reviewed-by: Connor Abbott <cwabbott0 at gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6445>

---

 src/gallium/drivers/radeonsi/si_shader_llvm_vs.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/gallium/drivers/radeonsi/si_shader_llvm_vs.c b/src/gallium/drivers/radeonsi/si_shader_llvm_vs.c
index 62ec43cd195..f0c93ac3264 100644
--- a/src/gallium/drivers/radeonsi/si_shader_llvm_vs.c
+++ b/src/gallium/drivers/radeonsi/si_shader_llvm_vs.c
@@ -132,8 +132,14 @@ static void load_input_vs(struct si_shader_context *ctx, unsigned input_index, L
       return;
    }
 
-   /* Do multiple loads for special formats. */
    unsigned required_channels = util_last_bit(info->input_usage_mask[input_index]);
+   if (required_channels == 0) {
+      for (unsigned i = 0; i < 4; ++i)
+         out[i] = LLVMGetUndef(ctx->ac.f32);
+      return;
+   }
+
+   /* Do multiple loads for special formats. */
    LLVMValueRef fetches[4];
    unsigned num_fetches;
    unsigned fetch_stride;