cmd/asm: add missing x86 instructions

Instructions added: CLDEMOTE, CLWB, TPAUSE, UMWAIT, UMONITOR.

Change-Id: I1ba550d4d5acc41a2fd97068ff5834e0412d3bcf
Reviewed-on: https://go-review.googlesource.com/c/go/+/183225
Run-TryBot: Cherry Zhang <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>
Reviewed-by: Cherry Zhang <[email protected]>

Author: Artem Alekseev

src/cmd/asm/internal/asm/testdata/amd64enc_extra.s

@@ -1049,5 +1049,11 @@ TEXT asmtest(SB),DUPOK|NOSPLIT,$0
 	VADDPD Z2, Z9, Z21 // 62e1b54858ea
 	VADDPD Z21, Z2, Z9 // 6231ed4858cd
 	VADDPD Z9, Z21, Z2 // 62d1d54058d1
+
+	CLWB (BX) // 660fae33
+	CLDEMOTE (BX) // 0f1c03
+	TPAUSE BX // 660faef3
+	UMONITOR BX // f30faef3
+	UMWAIT BX // f20faef3
 	// End of tests.
 	RET

src/cmd/asm/internal/asm/testdata/amd64error.s

@@ -132,4 +132,12 @@ TEXT errors(SB),$0
 	VADDPD.BCST X3, X2, K1, X1       // ERROR "illegal broadcast without memory argument"
 	VADDPD.BCST X3, X2, K1, X1       // ERROR "illegal broadcast without memory argument"
 	VADDPD.BCST X3, X2, K1, X1       // ERROR "illegal broadcast without memory argument"
+	// CLWB instuctions:
+	CLWB BX                          // ERROR "invalid instruction"
+	// CLDEMOTE instructions:
+	CLDEMOTE BX                      // ERROR "invalid instruction"
+	// WAITPKG instructions:
+	TPAUSE (BX)                      // ERROR "invalid instruction"
+	UMONITOR (BX)                    // ERROR "invalid instruction"
+	UMWAIT (BX)                      // ERROR "invalid instruction"
 	RET

src/cmd/internal/obj/x86/aenum.go

@@ -983,10 +983,12 @@ var optab =
 	{ACLAC, ynone, Pm, opBytes{01, 0xca}},
 	{ACLC, ynone, Px, opBytes{0xf8}},
 	{ACLD, ynone, Px, opBytes{0xfc}},
+	{ACLDEMOTE, yclflush, Pm, opBytes{0x1c, 00}},
 	{ACLFLUSH, yclflush, Pm, opBytes{0xae, 07}},
 	{ACLFLUSHOPT, yclflush, Pq, opBytes{0xae, 07}},
 	{ACLI, ynone, Px, opBytes{0xfa}},
 	{ACLTS, ynone, Pm, opBytes{0x06}},
+	{ACLWB, yclflush, Pq, opBytes{0xae, 06}},
 	{ACMC, ynone, Px, opBytes{0xf5}},
 	{ACMOVLCC, yml_rl, Pm, opBytes{0x43}},
 	{ACMOVLCS, yml_rl, Pm, opBytes{0x42}},
@@ -1500,13 +1502,15 @@ var optab =
 	{ATESTL, ytestl, Px, opBytes{0xa9, 0xf7, 00, 0x85, 0x85}},
 	{ATESTQ, ytestl, Pw, opBytes{0xa9, 0xf7, 00, 0x85, 0x85}},
 	{ATESTW, ytestl, Pe, opBytes{0xa9, 0xf7, 00, 0x85, 0x85}},
+	{ATPAUSE, ywrfsbase, Pq, opBytes{0xae, 06}},
 	{obj.ATEXT, ytext, Px, opBytes{}},
 	{AUCOMISD, yxm, Pe, opBytes{0x2e}},
 	{AUCOMISS, yxm, Pm, opBytes{0x2e}},
 	{AUNPCKHPD, yxm, Pe, opBytes{0x15}},
 	{AUNPCKHPS, yxm, Pm, opBytes{0x15}},
 	{AUNPCKLPD, yxm, Pe, opBytes{0x14}},
 	{AUNPCKLPS, yxm, Pm, opBytes{0x14}},
+	{AUMONITOR, ywrfsbase, Pf3, opBytes{0xae, 06}},
 	{AVERR, ydivl, Pm, opBytes{0x00, 04}},
 	{AVERW, ydivl, Pm, opBytes{0x00, 05}},
 	{AWAIT, ynone, Px, opBytes{0x9b}},
@@ -1691,11 +1695,11 @@ var optab =
 	{AMOVDDUP, yxm, Pf2, opBytes{0x12}},
 	{AMOVSHDUP, yxm, Pf3, opBytes{0x16}},
 	{AMOVSLDUP, yxm, Pf3, opBytes{0x12}},
-
 	{ARDTSCP, ynone, Pm, opBytes{0x01, 0xf9, 0}},
 	{ASTAC, ynone, Pm, opBytes{0x01, 0xcb, 0}},
 	{AUD1, ynone, Pm, opBytes{0xb9, 0}},
 	{AUD2, ynone, Pm, opBytes{0x0b, 0}},
+	{AUMWAIT, ywrfsbase, Pf2, opBytes{0xae, 06}},
 	{ASYSENTER, ynone, Px, opBytes{0x0f, 0x34, 0}},
 	{ASYSENTER64, ynone, Pw, opBytes{0x0f, 0x34, 0}},
 	{ASYSEXIT, ynone, Px, opBytes{0x0f, 0x35, 0}},

src/cmd/internal/obj/x86/anames.go

@@ -1136,8 +1136,10 @@ func stacksplit(ctxt *obj.Link, cursym *obj.LSym, p *obj.Prog, newprog obj.ProgA
 var unaryDst = map[obj.As]bool{
 	ABSWAPL:     true,
 	ABSWAPQ:     true,
+	ACLDEMOTE:   true,
 	ACLFLUSH:    true,
 	ACLFLUSHOPT: true,
+	ACLWB:       true,
 	ACMPXCHG16B: true,
 	ACMPXCHG8B:  true,
 	ADECB:       true,