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I''m trying to time a function within Firefoxwith a pid$target probe [2]. e.g dtrace -Zqw -x dynvarsize=64m -x evaltime=preinit -p 13954 -s menu- construct.d -s sigcont.d elapsed: 12.7942481ms cpu : 7.7911194ms count : 40 times I''m also measuring Firefox startup time by running it arguments like this: ... file:///Users/joelr/work/mozilla/startup/startup.html#`python

...eir motivating example here: https://gcc.gnu.org/onlinedocs/gcc-4.8.4/gcc/Extended-Asm.html #define TRACE1(NUM) \ do { \ asm goto ("0: nop;" \ ".pushsection trace_table;" \ ".long 0b, %l0;" \ ".popsection" \ : : : : trace#NUM); \ if (0) { trace#NUM: trace(); } \ } while (0) #define TRACE TRACE1(__COUNTER__)...

...u.org/onlinedocs/gcc-4.8.4/gcc/Extended-Asm.html > > > > #define TRACE1(NUM) \ > > do { \ > > asm goto ("0: nop;" \ > > ".pushsection trace_table;" \ > > ".long 0b, %l0;" \ > > ".popsection" \ > > : : : : trace#NUM); \ > > if (0) { trace#NUM: trace(); } \ > > } while...

...org/onlinedocs/gcc-4.8.4/gcc/Extended-Asm.html > >   > >      #define TRACE1(NUM)                         \ > >        do {                                      \ > >          asm goto ("0: nop;"                     \ > >                    ".pushsection trace_table;"   \ > >                    ".long 0b, %l0;"              \ > >                    ".popsection"                 \ > >                    : : : : trace#NUM);           \ > >          if (0) { trace#NUM: trace(); }          \ > >        } while...

...<https://gcc.gnu.org/onlinedocs/gcc-4.8.4/gcc/Extended-Asm.html> > > #define TRACE1(NUM) \ > do { \ > asm goto ("0: nop;" \ > ".pushsection trace_table;" \ > ".long 0b, %l0;" \ > ".popsection" \ > : : : : trace#NUM); \ > if (0) { trace#NUM: trace(); } \ > } while (0) > #define TR...

Linux kernel is using the “asm goto” feature, other projects probably use it as well. I think it provides motivation to support it in LLVM. Regarding the complexity, I believe there is some infrastructure that we can at least partially reuse (the support for “indirectbr” instruction). My focus is adding “asm goto” support, the other things are indeed completely orthogonal and came up in bugs