From: Xiaolin Zhao <zhaoxiaolin@loongson.cn>
Date: Fri, 13 Sep 2024 07:32:03 +0000 (+0800)
Subject: cmd/internal/obj/loong64: add support for instructions FSCALEB{F/D} and FLOGB{F/D}
X-Git-Tag: go1.24rc1~909
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=b895dd56308304bedcea17852c01dc0cd794bfb8;p=gostls13.git

cmd/internal/obj/loong64: add support for instructions FSCALEB{F/D} and FLOGB{F/D}

Go asm syntax:
	FSCALEB{F/D}	FK, FJ, FD
	FLOGB{F/D}	FJ, FD

Equivalent platform assembler syntax:
	fscaleb.{s/d}	fd, fj, fk
	flogb.{s/d}	fd, fj

Ref: https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html

Change-Id: I6cd75c7605adbb572dae86d6470ec7cf20ce0f6c
Reviewed-on: https://go-review.googlesource.com/c/go/+/612975
Auto-Submit: abner chenc <chenguoqi@loongson.cn>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Tim King <taking@google.com>
Reviewed-by: Meidan Li <limeidan@loongson.cn>
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
---

diff --git a/src/cmd/asm/internal/asm/testdata/loong64enc1.s b/src/cmd/asm/internal/asm/testdata/loong64enc1.s
index 45256beb7c..2688f7f22c 100644
--- a/src/cmd/asm/internal/asm/testdata/loong64enc1.s
+++ b/src/cmd/asm/internal/asm/testdata/loong64enc1.s
@@ -351,3 +351,8 @@ lable2:
 	BSTRPICKV	$0, R4, $0, R5	// 8500c000
 	BSTRPICKV	$63, R4, $0, R5	// 8500ff00
 	BSTRPICKV	$15, R4, $6, R5	// 8518cf00
+
+	FSCALEBF	F4, F5, F6	// a6901001
+	FSCALEBD	F4, F5, F6	// a6101101
+	FLOGBF		F4, F5		// 85241401
+	FLOGBD		F4, F5		// 85281401
diff --git a/src/cmd/internal/obj/loong64/a.out.go b/src/cmd/internal/obj/loong64/a.out.go
index 60b0a62180..a2a809cbc0 100644
--- a/src/cmd/internal/obj/loong64/a.out.go
+++ b/src/cmd/internal/obj/loong64/a.out.go
@@ -462,6 +462,10 @@ const (
 	// 3.2.1.7
 	AFCOPYSGF
 	AFCOPYSGD
+	AFSCALEBF
+	AFSCALEBD
+	AFLOGBF
+	AFLOGBD
 
 	// 3.2.1.8
 	AFCLASSF
diff --git a/src/cmd/internal/obj/loong64/anames.go b/src/cmd/internal/obj/loong64/anames.go
index ddf13eec6e..2dc6319c4b 100644
--- a/src/cmd/internal/obj/loong64/anames.go
+++ b/src/cmd/internal/obj/loong64/anames.go
@@ -191,6 +191,10 @@ var Anames = []string{
 	"FMAXD",
 	"FCOPYSGF",
 	"FCOPYSGD",
+	"FSCALEBF",
+	"FSCALEBD",
+	"FLOGBF",
+	"FLOGBD",
 	"FCLASSF",
 	"FCLASSD",
 	"FFINTFW",
diff --git a/src/cmd/internal/obj/loong64/asm.go b/src/cmd/internal/obj/loong64/asm.go
index 4e5bc15d33..926b9952a2 100644
--- a/src/cmd/internal/obj/loong64/asm.go
+++ b/src/cmd/internal/obj/loong64/asm.go
@@ -1042,6 +1042,8 @@ func buildop(ctxt *obj.Link) {
 			opset(ASQRTD, r0)
 			opset(AFCLASSF, r0)
 			opset(AFCLASSD, r0)
+			opset(AFLOGBF, r0)
+			opset(AFLOGBD, r0)
 
 		case AMOVVF:
 			opset(AMOVVD, r0)
@@ -1096,6 +1098,8 @@ func buildop(ctxt *obj.Link) {
 			opset(AFMAXD, r0)
 			opset(AFCOPYSGF, r0)
 			opset(AFCOPYSGD, r0)
+			opset(AFSCALEBF, r0)
+			opset(AFSCALEBD, r0)
 
 		case AAND:
 			opset(AOR, r0)
@@ -1969,6 +1973,10 @@ func (c *ctxt0) oprrr(a obj.As) uint32 {
 		return 0x211 << 15 // fmax.s
 	case AFMAXD:
 		return 0x212 << 15 // fmax.d
+	case AFSCALEBF:
+		return 0x221 << 15 // fscaleb.s
+	case AFSCALEBD:
+		return 0x222 << 15 // fscaleb.d
 	case AFCOPYSGF:
 		return 0x225 << 15 // fcopysign.s
 	case AFCOPYSGD:
@@ -2071,6 +2079,10 @@ func (c *ctxt0) oprr(a obj.As) uint32 {
 		return 0x4511 << 10
 	case ASQRTD:
 		return 0x4512 << 10
+	case AFLOGBF:
+		return 0x4509 << 10 // flogb.s
+	case AFLOGBD:
+		return 0x450a << 10 // flogb.d
 	case AFCLASSF:
 		return 0x450d << 10 // fclass.s
 	case AFCLASSD: