From 372787020d48da14976fcc56387c73110c7f838b Mon Sep 17 00:00:00 2001
From: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Date: Mon, 21 Dec 2020 17:11:36 -0500
Subject: [PATCH] pan/bi: Add bi_half and bi_byte selectors

Useful for extracting out part of an index, internally implemented via a
subword swizzle.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8215>
---
 src/panfrost/bifrost/compiler.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/panfrost/bifrost/compiler.h b/src/panfrost/bifrost/compiler.h
index aa980c49707..341ad2d8ae5 100644
--- a/src/panfrost/bifrost/compiler.h
+++ b/src/panfrost/bifrost/compiler.h
@@ -479,6 +479,24 @@ bi_word(bi_index idx, unsigned component)
         return idx;
 }
 
+/* Helps construct swizzles */
+static inline bi_index
+bi_half(bi_index idx, bool upper)
+{
+        assert(idx.swizzle == BI_SWIZZLE_H01);
+        idx.swizzle = upper ? BI_SWIZZLE_H11 : BI_SWIZZLE_H00;
+        return idx;
+}
+
+static inline bi_index
+bi_byte(bi_index idx, unsigned lane)
+{
+        assert(idx.swizzle == BI_SWIZZLE_H01);
+        assert(lane < 4);
+        idx.swizzle = BI_SWIZZLE_B0000 + lane;
+        return idx;
+}
+
 static inline bool
 bi_is_null(bi_index idx)
 {