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v[al]: add SYNC (memory barrier)

--- a/sys/src/cmd/va/lex.c

+++ b/sys/src/cmd/va/lex.c

@@ -343,6 +343,7 @@

 	"REMU",		LTYPE6, AREMU,

 	"RET",		LTYPE4, ARET,

 	"SYSCALL",	LTYPE4, ASYSCALL,

+	"SYNC",		LTYPE4, ASYNC,

 	"TLBP",		LTYPE4, ATLBP,

 	"TLBR",		LTYPE4, ATLBR,

 	"TLBWI",	LTYPE4, ATLBWI,

--- a/sys/src/cmd/vc/v.out.h

+++ b/sys/src/cmd/vc/v.out.h

@@ -157,6 +157,7 @@

 	ALL,

 	ASC,

+	ASYNC,

 	ALAST,

 };

--- a/sys/src/cmd/vl/asm.c

+++ b/sys/src/cmd/vl/asm.c

@@ -1360,6 +1360,7 @@

 	case ABREAK:	return OP(1,5);

 	case ASYSCALL:	return OP(1,4);

+	case ASYNC:	return OP(1,7);

 	case ATLBP:	return MMU(1,0);

 	case ATLBR:	return MMU(0,1);

 	case ATLBWI:	return MMU(0,2);

--- a/sys/src/cmd/vl/optab.c

+++ b/sys/src/cmd/vl/optab.c

@@ -229,7 +229,7 @@

 	{ ABCASE,	C_LCON,	C_NONE,	C_LBRA,		 46, 4, 0 },

 	{ ALL,		C_REG,	C_NONE,	C_SOREG,	 7, 4, REGZERO },

-	{ ASC,		C_REG,	C_NONE,	C_SOREG,	 7, 4, REGZERO }, 

+	{ ASC,		C_REG,	C_NONE,	C_SOREG,	 7, 4, REGZERO },

 	{ AXXX,		C_NONE,	C_NONE,	C_NONE,		 0, 4, 0 },

 };

--- a/sys/src/cmd/vl/span.c

+++ b/sys/src/cmd/vl/span.c

@@ -584,6 +584,7 @@

 			oprange[ATLBR] = oprange[r];

 			oprange[ATLBWI] = oprange[r];

 			oprange[ATLBWR] = oprange[r];

+			oprange[ASYNC] = oprange[r];

 			break;

 		case ACMPEQF:

 			oprange[ACMPGTF] = oprange[r];

-- 

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