Mesa (main): pan/bi: Lower swizzles on MUX.v2i16

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Module: Mesa
Branch: main
Commit: 62533a6e643a1531ae19ec4a6bc5b615ce2a6820
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=62533a6e643a1531ae19ec4a6bc5b615ce2a6820

Author: Alyssa Rosenzweig <alyssa at collabora.com>
Date:   Wed Jan  5 17:39:07 2022 -0500

pan/bi: Lower swizzles on MUX.v2i16

We'll generate this in a moment.

Signed-off-by: Alyssa Rosenzweig <alyssa at collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14576>

---

 src/panfrost/bifrost/bi_lower_swizzle.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/panfrost/bifrost/bi_lower_swizzle.c b/src/panfrost/bifrost/bi_lower_swizzle.c
index b7549b0f385..ddb8d1854cd 100644
--- a/src/panfrost/bifrost/bi_lower_swizzle.c
+++ b/src/panfrost/bifrost/bi_lower_swizzle.c
@@ -84,6 +84,13 @@ bi_lower_swizzle_16(bi_context *ctx, bi_instr *ins, unsigned src)
             else
                     break;
 
+        /* For some reason MUX.v2i16 allows swaps but not replication */
+        case BI_OPCODE_MUX_V2I16:
+                if (ins->src[src].swizzle == BI_SWIZZLE_H10)
+                        return;
+                else
+                        break;
+
         /* We don't want to deal with reswizzling logic in modifier prop. Move
          * the swizzle outside, it's easier for clamp propagation. */
         case BI_OPCODE_FCLAMP_V2F16: