From 3c0bf423818858f88bed9a0c252c0f8bdac734b2 Mon Sep 17 00:00:00 2001
From: David Heidelberg <david@ixit.cz>
Date: Thu, 3 Oct 2024 00:13:46 +0900
Subject: [PATCH] util: add aarch64 fast half-float to float conversion

Reviewed-by: Christian Gmeiner <cgmeiner@igalia.com>
Signed-off-by: David Heidelberg <david@ixit.cz>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31564>
---
 src/util/half_float.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/util/half_float.h b/src/util/half_float.h
index 779cf08bccd..a74d9a632dc 100644
--- a/src/util/half_float.h
+++ b/src/util/half_float.h
@@ -81,6 +81,16 @@ _mesa_half_to_float(uint16_t val)
       __asm volatile("vcvtph2ps %1, %0" : "=v"(out) : "v"(in));
       return out[0];
    }
+#elif defined(USE_AARCH64_ASM)
+   float result;
+   uint16_t in = val;
+
+   __asm volatile(
+     "fcvt %s0, %h1\n"
+     : "=w"(result)
+     : "w"(in)
+   );
+   return result;
 #endif
    return _mesa_half_to_float_slow(val);
 }