Date: Fri, 22 Apr 2016 13:44:12 +0000 (UTC) From: Andriy Gapon <avg@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r298473 - head/sys/cddl/dev/dtrace/x86 Message-ID: <201604221344.u3MDiCqC042558@repo.freebsd.org>
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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),
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