From 0256b035ac8b8c37d3ac40cbb179dfff47a587a4 Mon Sep 17 00:00:00 2001
From: Martin Kroeker <martin@ruby.chemie.uni-freiburg.de>
Date: Tue, 3 Nov 2026 19:04:07 +0100
Subject: [PATCH] Restore pre-5573 bf16to32 conversion to recover performance
 of non-hardware assisted SBGEMM

---
 kernel/generic/conversion_macros.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/kernel/generic/conversion_macros.h b/kernel/generic/conversion_macros.h
index 69f8520128..37fd77cc67 100644
--- a/kernel/generic/conversion_macros.h
+++ b/kernel/generic/conversion_macros.h
@@ -31,9 +31,19 @@
 static float
 bfloat16tof32 (bfloat16 value)
 {
+#if 0
   blasint one = 1;
   float result;
   sbf16tos_(&one, &value, &one, &result, &one);
+#else
+  float result = 0;
+  unsigned short* q = (unsigned short*) &result;
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+  q[0] = value;
+#else
+  q[1] = value;
+#endif
+#endif
   return result;
 }