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libmach: add DPPD decoding for amd64

reference: https://www.felixcloutier.com/x86/dppd

--- a/sys/src/libmach/8db.c

+++ b/sys/src/libmach/8db.c

@@ -378,6 +378,10 @@

 [0x81]	RM,0,		"INVVPID %r,%e",

 };

+static Optable optab660F3A[128] = {

+[0x41]	RM,Ib,		"DPPD	%i,%x,%X",

+};

+

 static Optable optab660F71[8]=

 {

 [0x02]	Ib,0,		"PSRLW	%i,%x",

@@ -406,6 +410,7 @@

 [0x2E]	RM,0,		"UCOMISD	%x,%X",

 [0x2F]	RM,0,		"COMISD	%x,%X",

 [0x38]	AUX,0,		optab660F38,

+[0x3A]	AUXMM,0,	optab660F3A,		/* SSE4 */

 [0x5A]	RM,0,		"CVTPD2PS	%x,%X",

 [0x5B]	RM,0,		"CVTPS2PL	%x,%X",

 [0x6A]	RM,0,		"PUNPCKHLQ %x,%X",

-- 

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