reflect: implement float32 for regabi riscv64

This CL implement archFloat32FromReg and archFloat32ToReg
need for riscv64 due to differences in the way float32 are
represented in registers as compared to other platforms.

Change-Id: I5eab27df242f84b387b0c8dc7f347c93b3fd9df0
Reviewed-on: https://go-review.googlesource.com/c/go/+/403134
Run-TryBot: mzh <mzh@golangcn.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

diff --git a/src/reflect/float32reg_generic.go b/src/reflect/float32reg_generic.go
index 307c0bb33c1c7c94bc33dd45d4f4f5e73d191c21..23ad4bf285b24873342e5e565228d2c66a08203f 100644 (file)
--- a/src/reflect/float32reg_generic.go
+++ b/src/reflect/float32reg_generic.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build !ppc64 && !ppc64le
+//go:build !ppc64 && !ppc64le && !riscv64
 
 package reflect
 

diff --git a/src/reflect/float32reg_riscv64.s b/src/reflect/float32reg_riscv64.s
new file mode 100644 (file)
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
+

diff --git a/src/reflect/stubs_riscv64.go b/src/reflect/stubs_riscv64.go
new file mode 100644 (file)
index 0000000..a72ebab
--- /dev/null
+++ b/src/reflect/stubs_riscv64.go
@@ -0,0 +1,8 @@
+// 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.
+
+package reflect
+
+func archFloat32FromReg(reg uint64) float32
+func archFloat32ToReg(val float32) uint64