cmd/internal/obj/loong64: add {,X}VSLT.{B/H/W/V}{,U} instructions support

  Go asm syntax:
	 VSLT{B,H,W,V}    V1,   V2, V3
	 VSLT{B,H,W,V}U   V1,   V2, V3
	 VSLT{B,H,W,V}    $-2,  V2, V3
	 VSLT{B,H,W,V}U   $8,   V2, V3
	XVSLT{B,H,W,V}    X1,   X2, X3
	XVSLT{B,H,W,V}U   X1,   X2, X3
	XVSLT{B,H,W,V}    $-16, X2, X3
	XVSLT{B,H,W,V}U   $31,  X2, X3

  Equivalent platform assembler syntax:
	 vslt.{b,h,w,d}    v3, v2, v1
	 vslt.{b,h,w,d}u   v3, v2, v1
	 vslti.{b,h,w,d}   v3, v2, $-2
	 vslti.{b,h,w,d}u  v3, v2, $8
	xvslt.{b,h,w,d}    x3, x2, x1
	xvslt.{b,h,w,d}u   x3, x2, x1
	xvslti.{b,h,w,d}   x3, x2, $-16
	xvslti.{b,h,w,d}u  x3, x2, $31

Change-Id: Iccfb65c0c19b62d2c5ec279a077393c68e1bf7d4
Reviewed-on: https://go-review.googlesource.com/c/go/+/721620
Reviewed-by: Mark Freeman <markfreeman@google.com>
Reviewed-by: Junyang Shao <shaojunyang@google.com>
Reviewed-by: Meidan Li <limeidan@loongson.cn>
Reviewed-by: sophie zhao <zhaoxiaolin@loongson.cn>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

3 files changed, 123 insertions, 0 deletions

diff --git a/src/cmd/internal/obj/loong64/a.out.go b/src/cmd/internal/obj/loong64/a.out.go
index 5b8bffc9f1..2eabe9bda8 100644
--- a/src/cmd/internal/obj/loong64/a.out.go
+++ b/src/cmd/internal/obj/loong64/a.out.go
@@ -912,6 +912,23 @@ const (
 	AVSEQV
 	AXVSEQV
 
+	AVSLTB
+	AVSLTH
+	AVSLTW
+	AVSLTV
+	AVSLTBU
+	AVSLTHU
+	AVSLTWU
+	AVSLTVU
+	AXVSLTB
+	AXVSLTH
+	AXVSLTW
+	AXVSLTV
+	AXVSLTBU
+	AXVSLTHU
+	AXVSLTWU
+	AXVSLTVU
+
 	// LSX and LASX integer div and mod instructions
 	AVDIVB
 	AVDIVH
diff --git a/src/cmd/internal/obj/loong64/anames.go b/src/cmd/internal/obj/loong64/anames.go
index 1749b43bf6..92e3cab950 100644
--- a/src/cmd/internal/obj/loong64/anames.go
+++ b/src/cmd/internal/obj/loong64/anames.go
@@ -400,6 +400,22 @@ var Anames = []string{
 	"XVSEQW",
 	"VSEQV",
 	"XVSEQV",
+	"VSLTB",
+	"VSLTH",
+	"VSLTW",
+	"VSLTV",
+	"VSLTBU",
+	"VSLTHU",
+	"VSLTWU",
+	"VSLTVU",
+	"XVSLTB",
+	"XVSLTH",
+	"XVSLTW",
+	"XVSLTV",
+	"XVSLTBU",
+	"XVSLTHU",
+	"XVSLTWU",
+	"XVSLTVU",
 	"VDIVB",
 	"VDIVH",
 	"VDIVW",
diff --git a/src/cmd/internal/obj/loong64/asm.go b/src/cmd/internal/obj/loong64/asm.go
index b35e49a1b6..a39a668316 100644
--- a/src/cmd/internal/obj/loong64/asm.go
+++ b/src/cmd/internal/obj/loong64/asm.go
@@ -93,6 +93,14 @@ var optab = []Optab{
 	{AXVSEQB, C_XREG, C_XREG, C_NONE, C_XREG, C_NONE, 2, 4, 0, 0},
 	{AVSEQB, C_S5CON, C_VREG, C_NONE, C_VREG, C_NONE, 22, 4, 0, 0},
 	{AXVSEQB, C_S5CON, C_XREG, C_NONE, C_XREG, C_NONE, 22, 4, 0, 0},
+
+	{AVSLTB, C_VREG, C_VREG, C_NONE, C_VREG, C_NONE, 2, 4, 0, 0},
+	{AXVSLTB, C_XREG, C_XREG, C_NONE, C_XREG, C_NONE, 2, 4, 0, 0},
+	{AVSLTB, C_S5CON, C_VREG, C_NONE, C_VREG, C_NONE, 22, 4, 0, 0},
+	{AXVSLTB, C_S5CON, C_XREG, C_NONE, C_XREG, C_NONE, 22, 4, 0, 0},
+	{AVSLTB, C_U5CON, C_VREG, C_NONE, C_VREG, C_NONE, 31, 4, 0, 0},
+	{AXVSLTB, C_U5CON, C_XREG, C_NONE, C_XREG, C_NONE, 31, 4, 0, 0},
+
 	{AVANDV, C_VREG, C_VREG, C_NONE, C_VREG, C_NONE, 2, 4, 0, 0},
 	{AVANDV, C_VREG, C_NONE, C_NONE, C_VREG, C_NONE, 2, 4, 0, 0},
 	{AXVANDV, C_XREG, C_XREG, C_NONE, C_XREG, C_NONE, 2, 4, 0, 0},
@@ -1784,6 +1792,24 @@ func buildop(ctxt *obj.Link) {
 			opset(AXVSHUFW, r0)
 			opset(AXVSHUFV, r0)
 
+		case AVSLTB:
+			opset(AVSLTH, r0)
+			opset(AVSLTW, r0)
+			opset(AVSLTV, r0)
+			opset(AVSLTBU, r0)
+			opset(AVSLTHU, r0)
+			opset(AVSLTWU, r0)
+			opset(AVSLTVU, r0)
+
+		case AXVSLTB:
+			opset(AXVSLTH, r0)
+			opset(AXVSLTW, r0)
+			opset(AXVSLTV, r0)
+			opset(AXVSLTBU, r0)
+			opset(AXVSLTHU, r0)
+			opset(AXVSLTWU, r0)
+			opset(AXVSLTVU, r0)
+
 		case AVANDB:
 			opset(AVORB, r0)
 			opset(AVXORB, r0)
@@ -3379,6 +3405,38 @@ func (c *ctxt0) oprrr(a obj.As) uint32 {
 		return 0x0e003 << 15 // vseq.d
 	case AXVSEQV:
 		return 0x0e803 << 15 // xvseq.d
+	case AVSLTB:
+		return 0x0E00C << 15 // vslt.b
+	case AVSLTH:
+		return 0x0E00D << 15 // vslt.h
+	case AVSLTW:
+		return 0x0E00E << 15 // vslt.w
+	case AVSLTV:
+		return 0x0E00F << 15 // vslt.d
+	case AVSLTBU:
+		return 0x0E010 << 15 // vslt.bu
+	case AVSLTHU:
+		return 0x0E011 << 15 // vslt.hu
+	case AVSLTWU:
+		return 0x0E012 << 15 // vslt.wu
+	case AVSLTVU:
+		return 0x0E013 << 15 // vslt.du
+	case AXVSLTB:
+		return 0x0E80C << 15 // xvslt.b
+	case AXVSLTH:
+		return 0x0E80D << 15 // xvslt.h
+	case AXVSLTW:
+		return 0x0E80E << 15 // xvslt.w
+	case AXVSLTV:
+		return 0x0E80F << 15 // xvslt.d
+	case AXVSLTBU:
+		return 0x0E810 << 15 // xvslt.bu
+	case AXVSLTHU:
+		return 0x0E811 << 15 // xvslt.hu
+	case AXVSLTWU:
+		return 0x0E812 << 15 // xvslt.wu
+	case AXVSLTVU:
+		return 0x0E813 << 15 // xvslt.du
 	case AVANDV:
 		return 0x0E24C << 15 // vand.v
 	case AVORV:
@@ -4399,6 +4457,38 @@ func (c *ctxt0) opirr(a obj.As) uint32 {
 		return 0x0ED02 << 15 // xvseqi.w
 	case AXVSEQV:
 		return 0x0ED03 << 15 // xvseqi.d
+	case AVSLTB:
+		return 0x0E50C << 15 // vslti.b
+	case AVSLTH:
+		return 0x0E50D << 15 // vslti.h
+	case AVSLTW:
+		return 0x0E50E << 15 // vslti.w
+	case AVSLTV:
+		return 0x0E50F << 15 // vslti.d
+	case AVSLTBU:
+		return 0x0E510 << 15 // vslti.bu
+	case AVSLTHU:
+		return 0x0E511 << 15 // vslti.hu
+	case AVSLTWU:
+		return 0x0E512 << 15 // vslti.wu
+	case AVSLTVU:
+		return 0x0E513 << 15 // vslti.du
+	case AXVSLTB:
+		return 0x0ED0C << 15 // xvslti.b
+	case AXVSLTH:
+		return 0x0ED0D << 15 // xvslti.h
+	case AXVSLTW:
+		return 0x0ED0E << 15 // xvslti.w
+	case AXVSLTV:
+		return 0x0ED0F << 15 // xvslti.d
+	case AXVSLTBU:
+		return 0x0ED10 << 15 // xvslti.bu
+	case AXVSLTHU:
+		return 0x0ED11 << 15 // xvslti.hu
+	case AXVSLTWU:
+		return 0x0ED12 << 15 // xvslti.wu
+	case AXVSLTVU:
+		return 0x0ED13 << 15 // xvslti.du
 	case AVROTRB:
 		return 0x1ca8<<18 | 0x1<<13 // vrotri.b
 	case AVROTRH: