Adding upstream version 1.21.8.upstream/1.21.8

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/src/reflect/float32reg_riscv64.s b/src/reflect/float32reg_riscv64.s
new file mode 100644
index 0000000..8fcf3ba
--- /dev/null
+++ b/src/reflect/float32reg_riscv64.s
@@ -0,0 +1,27 @@
+// Copyright 2022 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "textflag.h"
+
+// riscv64 allows 32-bit floats to live in the bottom
+// part of the register, it expects them to be NaN-boxed.
+// These functions are needed to ensure correct conversions
+// on riscv64.
+
+// Convert float32->uint64
+TEXT ·archFloat32ToReg(SB),NOSPLIT,$0-16
+	MOVF	val+0(FP), F1
+	MOVD	F1, ret+8(FP)
+	RET
+
+// Convert uint64->float32
+TEXT ·archFloat32FromReg(SB),NOSPLIT,$0-12
+	// Normally a float64->float32 conversion
+	// would need rounding, but riscv64 store valid
+	// float32 in the lower 32 bits, thus we only need to
+	// unboxed the NaN-box by store a float32.
+	MOVD	reg+0(FP), F1
+	MOVF	F1, ret+8(FP)
+	RET
+