From 7240c6cb970bd395e7005988b4ce6af73a8e59c0 Mon Sep 17 00:00:00 2001
From: Xiaolin Zhao <zhaoxiaolin@loongson.cn>
Date: Thu, 31 Oct 2024 15:11:05 +0800
Subject: [PATCH] cmd/asm: add support for loong64 CRC32 instructions

This patch is a copy of CL 478595.
Co-authored-by: WANG Xuerui <git@xen0n.name>

Change-Id: Ifb6e8183c83a5dfe5dec84e173a74d5de62692a0
Reviewed-on: https://go-review.googlesource.com/c/go/+/623875
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
---
 .../asm/internal/asm/testdata/loong64enc1.s   | 10 ++++++++
 src/cmd/internal/obj/loong64/a.out.go         | 10 ++++++++
 src/cmd/internal/obj/loong64/anames.go        |  8 ++++++
 src/cmd/internal/obj/loong64/asm.go           | 25 ++++++++++++++++++-
 4 files changed, 52 insertions(+), 1 deletion(-)

diff --git a/src/cmd/asm/internal/asm/testdata/loong64enc1.s b/src/cmd/asm/internal/asm/testdata/loong64enc1.s
index fd3cdcb753..2239fe0c68 100644
--- a/src/cmd/asm/internal/asm/testdata/loong64enc1.s
+++ b/src/cmd/asm/internal/asm/testdata/loong64enc1.s
@@ -208,6 +208,16 @@ lable2:
 	MASKEQZ	R4, R5, R6		// a6101300
 	MASKNEZ	R4, R5, R6		// a6901300
 
+	// CRC32
+	CRCWBW	R4, R5, R6		// a6102400
+	CRCWHW	R4, R5, R6		// a6902400
+	CRCWWW	R4, R5, R6		// a6102500
+	CRCWVW	R4, R5, R6		// a6902500
+	CRCCWBW	R4, R5, R6		// a6102600
+	CRCCWHW	R4, R5, R6		// a6902600
+	CRCCWWW	R4, R5, R6		// a6102700
+	CRCCWVW	R4, R5, R6		// a6902700
+
 	MOVFD	F4, F5			// 85241901
 	MOVDF	F4, F5			// 85181901
 	MOVWF	F4, F5			// 85101d01
diff --git a/src/cmd/internal/obj/loong64/a.out.go b/src/cmd/internal/obj/loong64/a.out.go
index 6653b7fe98..9470f9418c 100644
--- a/src/cmd/internal/obj/loong64/a.out.go
+++ b/src/cmd/internal/obj/loong64/a.out.go
@@ -477,6 +477,16 @@ const (
 	ABSTRPICKW
 	ABSTRPICKV
 
+	// 2.2.9. CRC Check Instructions
+	ACRCWBW
+	ACRCWHW
+	ACRCWWW
+	ACRCWVW
+	ACRCCWBW
+	ACRCCWHW
+	ACRCCWWW
+	ACRCCWVW
+
 	// 2.2.10. Other Miscellaneous Instructions
 	ARDTIMELW
 	ARDTIMEHW
diff --git a/src/cmd/internal/obj/loong64/anames.go b/src/cmd/internal/obj/loong64/anames.go
index 2cbf305196..28566d1504 100644
--- a/src/cmd/internal/obj/loong64/anames.go
+++ b/src/cmd/internal/obj/loong64/anames.go
@@ -199,6 +199,14 @@ var Anames = []string{
 	"BSTRINSV",
 	"BSTRPICKW",
 	"BSTRPICKV",
+	"CRCWBW",
+	"CRCWHW",
+	"CRCWWW",
+	"CRCWVW",
+	"CRCCWBW",
+	"CRCCWHW",
+	"CRCCWWW",
+	"CRCCWVW",
 	"RDTIMELW",
 	"RDTIMEHW",
 	"RDTIMED",
diff --git a/src/cmd/internal/obj/loong64/asm.go b/src/cmd/internal/obj/loong64/asm.go
index 985c054ece..3f3a352ee1 100644
--- a/src/cmd/internal/obj/loong64/asm.go
+++ b/src/cmd/internal/obj/loong64/asm.go
@@ -1234,6 +1234,14 @@ func buildop(ctxt *obj.Link) {
 
 		case AMASKEQZ:
 			opset(AMASKNEZ, r0)
+			opset(ACRCWBW, r0)
+			opset(ACRCWHW, r0)
+			opset(ACRCWWW, r0)
+			opset(ACRCWVW, r0)
+			opset(ACRCCWBW, r0)
+			opset(ACRCCWHW, r0)
+			opset(ACRCCWWW, r0)
+			opset(ACRCCWVW, r0)
 
 		case ANOOP:
 			opset(obj.AUNDEF, r0)
@@ -1949,7 +1957,22 @@ func (c *ctxt0) oprrr(a obj.As) uint32 {
 		return 0x45 << 15 // mod.d
 	case AREMVU:
 		return 0x47 << 15 // mod.du
-
+	case ACRCWBW:
+		return 0x48 << 15 // crc.w.b.w
+	case ACRCWHW:
+		return 0x49 << 15 // crc.w.h.w
+	case ACRCWWW:
+		return 0x4a << 15 // crc.w.w.w
+	case ACRCWVW:
+		return 0x4b << 15 // crc.w.d.w
+	case ACRCCWBW:
+		return 0x4c << 15 // crcc.w.b.w
+	case ACRCCWHW:
+		return 0x4d << 15 // crcc.w.h.w
+	case ACRCCWWW:
+		return 0x4e << 15 // crcc.w.w.w
+	case ACRCCWVW:
+		return 0x4f << 15 // crcc.w.d.w
 	case AJMP:
 		return 0x13 << 26 // jirl r0, rj, 0
 	case AJAL:
-- 
2.48.1