_       _ _(_)_     |  A fresh approach to technical computing
  (_)     | (_) (_)    |  Documentation: http://docs.julialang.org
   _ _   _| |_  __ _   |  Type "help()" for help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 0.4.0-dev+1443 (2014-11-07 15:03 UTC)
 _/ |\__'_|_|_|\__'_|  |  Commit 0790c92* (0 days old master)
|__/                   |  x86_64-apple-darwin14.0.0

julia> f(x) = x^-2
f (generic function with 1 method)

julia> g(x) = 1/x^2
g (generic function with 1 method)

julia> h(x) = 1/x/x
h (generic function with 1 method)

julia> f(1.) == g(1.) == h(1.)
true

julia> code_llvm(f, (Float64,))

define double @"julia_f;40365"(double) {
top:
  %1 = call double @pow(double %0, double -2.000000e+00), !dbg !286
  ret double %1, !dbg !286
}

julia> code_llvm(g, (Float64,))

define double @"julia_g;40366"(double) {
top:
  %1 = fmul double %0, %0, !dbg !289
  %2 = fdiv double 1.000000e+00, %1, !dbg !289
  ret double %2, !dbg !289
}

julia> code_llvm(h, (Float64,))

define double @"julia_h;40367"(double) {
top:
  %1 = fdiv double 1.000000e+00, %0, !dbg !292
  %2 = fdiv double %1, %0, !dbg !292
  ret double %2, !dbg !292
}

julia>