svn commit: r298473 - head/sys/cddl/dev/dtrace/x86

[Andriy Gapon]

Author: avg
Date: Fri Apr 22 13:44:12 2016
New Revision: 298473
URL: https://svnweb.freebsd.org/changeset/base/298473

Log:
  lahf/sahf are supported on some amd64 processors
  
  While the instructions were not included into the original instruction
  set, their support can be indicated by a special feature bit.
  For example:
    CPU: AMD Phenom(tm) II X4 955 Processor (3214.71-MHz K8-class CPU)
    ...
      AMD Features2=0x37ff<LAHF, ...>
  
  Clang 3.8 uses lahf/sahf as a faster alternative to pushf/popf where
  possible.
  
  MFC after:	2 weeks

Modified:
  head/sys/cddl/dev/dtrace/x86/dis_tables.c

Modified: head/sys/cddl/dev/dtrace/x86/dis_tables.c
==============================================================================
--- head/sys/cddl/dev/dtrace/x86/dis_tables.c	Fri Apr 22 13:00:27 2016	(r298472)
+++ head/sys/cddl/dev/dtrace/x86/dis_tables.c	Fri Apr 22 13:44:12 2016	(r298473)
@@ -1931,7 +1931,7 @@ const instable_t dis_distable[16][16] = 
 /* [9,0] */	TNS("nop",NORM),	TS("xchg",RA),		TS("xchg",RA),		TS("xchg",RA),
 /* [9,4] */	TS("xchg",RA),		TS("xchg",RA),		TS("xchg",RA),		TS("xchg",RA),
 /* [9,8] */	TNS("cXtX",CBW),	TNS("cXtX",CWD),	TNSx("lcall",SO),	TNS("fwait",NORM),
-/* [9,C] */	TSZy("pushf",IMPLMEM,4),TSZy("popf",IMPLMEM,4),	TNSx("sahf",NORM),	TNSx("lahf",NORM),
+/* [9,C] */	TSZy("pushf",IMPLMEM,4),TSZy("popf",IMPLMEM,4),	TNS("sahf",NORM),	TNS("lahf",NORM),
 }, {
 /* [A,0] */	TNS("movb",OA),		TS("mov",OA),		TNS("movb",AO),		TS("mov",AO),
 /* [A,4] */	TNSZ("movsb",SD,1),	TS("movs",SD),		TNSZ("cmpsb",SD,1),	TS("cmps",SD),