cmd/internal/obj/loong64: remove Class C_LEXT and C_SEXT

There is no need to check whether the symbol is empty, since we have already
checked it before. In addition, it is enough to use C_ADDR to represent memory
access, C_LEXT and C_SEXT are not needed.

Change-Id: I7158d6b549482b35cd9ac5fba781648fb3f21922
Reviewed-on: https://go-review.googlesource.com/c/go/+/565615
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: abner chenc <chenguoqi@loongson.cn>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: sophie zhao <zhaoxiaolin@loongson.cn>
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
Reviewed-by: Qiqi Huang <huangqiqi@loongson.cn>

3 files changed, 13 insertions, 57 deletions

diff --git a/src/cmd/internal/obj/loong64/a.out.go b/src/cmd/internal/obj/loong64/a.out.go
index 29ee1bb282..cf5c74fde2 100644
--- a/src/cmd/internal/obj/loong64/a.out.go
+++ b/src/cmd/internal/obj/loong64/a.out.go
@@ -204,19 +204,17 @@ const (
 	C_UCON // 32 bit signed, low 12 bits 0
 	C_ADD0CON
 	C_AND0CON
-	C_ADDCON // -0x800 <= v < 0
-	C_ANDCON // 0 < v <= 0xFFF
-	C_LCON   // other 32
-	C_DCON   // other 64 (could subdivide further)
-	C_SACON  // $n(REG) where n <= int12
-	C_LACON // $n(REG) where int12 < n <= int32
+	C_ADDCON  // -0x800 <= v < 0
+	C_ANDCON  // 0 < v <= 0xFFF
+	C_LCON    // other 32
+	C_DCON    // other 64 (could subdivide further)
+	C_SACON   // $n(REG) where n <= int12
+	C_LACON   // $n(REG) where int12 < n <= int32
 	C_EXTADDR // external symbol address
-	C_DACON // $n(REG) where int32 < n
+	C_DACON   // $n(REG) where int32 < n
 	C_BRAN
 	C_SAUTO
 	C_LAUTO
-	C_SEXT
-	C_LEXT
 	C_ZOREG
 	C_SOREG
 	C_LOREG
diff --git a/src/cmd/internal/obj/loong64/asm.go b/src/cmd/internal/obj/loong64/asm.go
index 1e4dd111f1..0636ec1862 100644
--- a/src/cmd/internal/obj/loong64/asm.go
+++ b/src/cmd/internal/obj/loong64/asm.go
@@ -92,11 +92,6 @@ var optab = []Optab{
 	{AMOVF, C_FREG, C_NONE, C_NONE, C_FREG, C_NONE, 9, 4, 0, 0},
 	{AMOVD, C_FREG, C_NONE, C_NONE, C_FREG, C_NONE, 9, 4, 0, 0},
 
-	{AMOVW, C_REG, C_NONE, C_NONE, C_SEXT, C_NONE, 7, 4, 0, 0},
-	{AMOVWU, C_REG, C_NONE, C_NONE, C_SEXT, C_NONE, 7, 4, 0, 0},
-	{AMOVV, C_REG, C_NONE, C_NONE, C_SEXT, C_NONE, 7, 4, 0, 0},
-	{AMOVB, C_REG, C_NONE, C_NONE, C_SEXT, C_NONE, 7, 4, 0, 0},
-	{AMOVBU, C_REG, C_NONE, C_NONE, C_SEXT, C_NONE, 7, 4, 0, 0},
 	{AMOVW, C_REG, C_NONE, C_NONE, C_SAUTO, C_NONE, 7, 4, REGSP, 0},
 	{AMOVWU, C_REG, C_NONE, C_NONE, C_SAUTO, C_NONE, 7, 4, REGSP, 0},
 	{AMOVV, C_REG, C_NONE, C_NONE, C_SAUTO, C_NONE, 7, 4, REGSP, 0},
@@ -110,11 +105,6 @@ var optab = []Optab{
 	{ASC, C_REG, C_NONE, C_NONE, C_SOREG, C_NONE, 7, 4, REGZERO, 0},
 	{ASCV, C_REG, C_NONE, C_NONE, C_SOREG, C_NONE, 7, 4, REGZERO, 0},
 
-	{AMOVW, C_SEXT, C_NONE, C_NONE, C_REG, C_NONE, 8, 4, 0, 0},
-	{AMOVWU, C_SEXT, C_NONE, C_NONE, C_REG, C_NONE, 8, 4, 0, 0},
-	{AMOVV, C_SEXT, C_NONE, C_NONE, C_REG, C_NONE, 8, 4, 0, 0},
-	{AMOVB, C_SEXT, C_NONE, C_NONE, C_REG, C_NONE, 8, 4, 0, 0},
-	{AMOVBU, C_SEXT, C_NONE, C_NONE, C_REG, C_NONE, 8, 4, 0, 0},
 	{AMOVW, C_SAUTO, C_NONE, C_NONE, C_REG, C_NONE, 8, 4, REGSP, 0},
 	{AMOVWU, C_SAUTO, C_NONE, C_NONE, C_REG, C_NONE, 8, 4, REGSP, 0},
 	{AMOVV, C_SAUTO, C_NONE, C_NONE, C_REG, C_NONE, 8, 4, REGSP, 0},
@@ -128,11 +118,6 @@ var optab = []Optab{
 	{ALL, C_SOREG, C_NONE, C_NONE, C_REG, C_NONE, 8, 4, REGZERO, 0},
 	{ALLV, C_SOREG, C_NONE, C_NONE, C_REG, C_NONE, 8, 4, REGZERO, 0},
 
-	{AMOVW, C_REG, C_NONE, C_NONE, C_LEXT, C_NONE, 35, 12, 0, 0},
-	{AMOVWU, C_REG, C_NONE, C_NONE, C_LEXT, C_NONE, 35, 12, 0, 0},
-	{AMOVV, C_REG, C_NONE, C_NONE, C_LEXT, C_NONE, 35, 12, 0, 0},
-	{AMOVB, C_REG, C_NONE, C_NONE, C_LEXT, C_NONE, 35, 12, 0, 0},
-	{AMOVBU, C_REG, C_NONE, C_NONE, C_LEXT, C_NONE, 35, 12, 0, 0},
 	{AMOVW, C_REG, C_NONE, C_NONE, C_LAUTO, C_NONE, 35, 12, REGSP, 0},
 	{AMOVWU, C_REG, C_NONE, C_NONE, C_LAUTO, C_NONE, 35, 12, REGSP, 0},
 	{AMOVV, C_REG, C_NONE, C_NONE, C_LAUTO, C_NONE, 35, 12, REGSP, 0},
@@ -155,11 +140,6 @@ var optab = []Optab{
 	{AMOVB, C_REG, C_NONE, C_NONE, C_TLS_LE, C_NONE, 53, 16, 0, 0},
 	{AMOVBU, C_REG, C_NONE, C_NONE, C_TLS_LE, C_NONE, 53, 16, 0, 0},
 
-	{AMOVW, C_LEXT, C_NONE, C_NONE, C_REG, C_NONE, 36, 12, 0, 0},
-	{AMOVWU, C_LEXT, C_NONE, C_NONE, C_REG, C_NONE, 36, 12, 0, 0},
-	{AMOVV, C_LEXT, C_NONE, C_NONE, C_REG, C_NONE, 36, 12, 0, 0},
-	{AMOVB, C_LEXT, C_NONE, C_NONE, C_REG, C_NONE, 36, 12, 0, 0},
-	{AMOVBU, C_LEXT, C_NONE, C_NONE, C_REG, C_NONE, 36, 12, 0, 0},
 	{AMOVW, C_LAUTO, C_NONE, C_NONE, C_REG, C_NONE, 36, 12, REGSP, 0},
 	{AMOVWU, C_LAUTO, C_NONE, C_NONE, C_REG, C_NONE, 36, 12, REGSP, 0},
 	{AMOVV, C_LAUTO, C_NONE, C_NONE, C_REG, C_NONE, 36, 12, REGSP, 0},
@@ -251,17 +231,11 @@ var optab = []Optab{
 	{AJMP, C_NONE, C_NONE, C_NONE, C_ZOREG, C_NONE, 18, 4, REGZERO, 0}, // jirl r0, rj, 0
 	{AJAL, C_NONE, C_NONE, C_NONE, C_ZOREG, C_NONE, 18, 4, REGLINK, 0}, // jirl r1, rj, 0
 
-	{AMOVW, C_SEXT, C_NONE, C_NONE, C_FREG, C_NONE, 27, 4, 0, 0},
-	{AMOVF, C_SEXT, C_NONE, C_NONE, C_FREG, C_NONE, 27, 4, 0, 0},
-	{AMOVD, C_SEXT, C_NONE, C_NONE, C_FREG, C_NONE, 27, 4, 0, 0},
 	{AMOVF, C_SAUTO, C_NONE, C_NONE, C_FREG, C_NONE, 27, 4, REGSP, 0},
 	{AMOVD, C_SAUTO, C_NONE, C_NONE, C_FREG, C_NONE, 27, 4, REGSP, 0},
 	{AMOVF, C_SOREG, C_NONE, C_NONE, C_FREG, C_NONE, 27, 4, REGZERO, 0},
 	{AMOVD, C_SOREG, C_NONE, C_NONE, C_FREG, C_NONE, 27, 4, REGZERO, 0},
 
-	{AMOVW, C_LEXT, C_NONE, C_NONE, C_FREG, C_NONE, 27, 12, 0, 0},
-	{AMOVF, C_LEXT, C_NONE, C_NONE, C_FREG, C_NONE, 27, 12, 0, 0},
-	{AMOVD, C_LEXT, C_NONE, C_NONE, C_FREG, C_NONE, 27, 12, 0, 0},
 	{AMOVF, C_LAUTO, C_NONE, C_NONE, C_FREG, C_NONE, 27, 12, REGSP, 0},
 	{AMOVD, C_LAUTO, C_NONE, C_NONE, C_FREG, C_NONE, 27, 12, REGSP, 0},
 	{AMOVF, C_LOREG, C_NONE, C_NONE, C_FREG, C_NONE, 27, 12, REGZERO, 0},
@@ -269,17 +243,11 @@ var optab = []Optab{
 	{AMOVF, C_ADDR, C_NONE, C_NONE, C_FREG, C_NONE, 51, 8, 0, 0},
 	{AMOVD, C_ADDR, C_NONE, C_NONE, C_FREG, C_NONE, 51, 8, 0, 0},
 
-	{AMOVW, C_FREG, C_NONE, C_NONE, C_SEXT, C_NONE, 28, 4, 0, 0},
-	{AMOVF, C_FREG, C_NONE, C_NONE, C_SEXT, C_NONE, 28, 4, 0, 0},
-	{AMOVD, C_FREG, C_NONE, C_NONE, C_SEXT, C_NONE, 28, 4, 0, 0},
 	{AMOVF, C_FREG, C_NONE, C_NONE, C_SAUTO, C_NONE, 28, 4, REGSP, 0},
 	{AMOVD, C_FREG, C_NONE, C_NONE, C_SAUTO, C_NONE, 28, 4, REGSP, 0},
 	{AMOVF, C_FREG, C_NONE, C_NONE, C_SOREG, C_NONE, 28, 4, REGZERO, 0},
 	{AMOVD, C_FREG, C_NONE, C_NONE, C_SOREG, C_NONE, 28, 4, REGZERO, 0},
 
-	{AMOVW, C_FREG, C_NONE, C_NONE, C_LEXT, C_NONE, 28, 12, 0, 0},
-	{AMOVF, C_FREG, C_NONE, C_NONE, C_LEXT, C_NONE, 28, 12, 0, 0},
-	{AMOVD, C_FREG, C_NONE, C_NONE, C_LEXT, C_NONE, 28, 12, 0, 0},
 	{AMOVF, C_FREG, C_NONE, C_NONE, C_LAUTO, C_NONE, 28, 12, REGSP, 0},
 	{AMOVD, C_FREG, C_NONE, C_NONE, C_LAUTO, C_NONE, 28, 12, REGSP, 0},
 	{AMOVF, C_FREG, C_NONE, C_NONE, C_LOREG, C_NONE, 28, 12, REGZERO, 0},
@@ -661,17 +629,14 @@ func (c *ctxt0) aclass(a *obj.Addr) int {
 				break
 			}
 			c.instoffset = a.Offset
-			if a.Sym != nil { // use relocation
-				if a.Sym.Type == objabi.STLSBSS {
-					if c.ctxt.Flag_shared {
-						return C_TLS_IE
-					} else {
-						return C_TLS_LE
-					}
+			if a.Sym.Type == objabi.STLSBSS {
+				if c.ctxt.Flag_shared {
+					return C_TLS_IE
+				} else {
+					return C_TLS_LE
 				}
-				return C_ADDR
 			}
-			return C_LEXT
+			return C_ADDR
 
 		case obj.NAME_AUTO:
 			if a.Reg == REGSP {
@@ -950,11 +915,6 @@ func cmp(a int, b int) bool {
 			return true
 		}
 
-	case C_LEXT:
-		if b == C_SEXT {
-			return true
-		}
-
 	case C_LAUTO:
 		if b == C_SAUTO {
 			return true
diff --git a/src/cmd/internal/obj/loong64/cnames.go b/src/cmd/internal/obj/loong64/cnames.go
index 02b18272ca..8e103b888f 100644
--- a/src/cmd/internal/obj/loong64/cnames.go
+++ b/src/cmd/internal/obj/loong64/cnames.go
@@ -27,8 +27,6 @@ var cnames0 = []string{
 	"BRAN",
 	"SAUTO",
 	"LAUTO",
-	"SEXT",
-	"LEXT",
 	"ZOREG",
 	"SOREG",
 	"LOREG",