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Provide a streamlined '#define curthread __curthread()' for amd64 to avoid
the compiler having to parse and optimize the PCPU_GET(curthread) so often. __curthread() is an inline optimized version of PCPU_GET(curthread) that knows that pc_curthread is at offset zero in the pcpu struct. Add a CTASSERT() to catch any possible changes to this. This accounts for just over a 1% wall clock speedup for total kernel compile/link time, and 20% compile time speedup on some specific files depending on which compile options are used. Approved by: re (jhb)
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=122930
@ -121,6 +121,9 @@ __FBSDID("$FreeBSD$");
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#include <sys/ptrace.h>
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#include <machine/sigframe.h>
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/* Sanity check for __curthread() */
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CTASSERT(offsetof(struct pcpu, pc_curthread) == 0);
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extern u_int64_t hammer_time(u_int64_t, u_int64_t);
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extern void dblfault_handler(void);
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@ -159,6 +159,16 @@ extern struct pcpu *pcpup;
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#define PCPU_PTR(member) __PCPU_PTR(pc_ ## member)
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#define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val)
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static __inline struct thread *
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__curthread(void)
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{
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struct thread *td;
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__asm __volatile("movq %%gs:0,%0" : "=r" (td));
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return (td);
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}
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#define Xurthread (__curthread())
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#else
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#error gcc or lint is required to use this file
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#endif
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