• via Digitalmars-d-bugs (42/42) Oct 05 2015 https://issues.dlang.org/show_bug.cgi?id=15159

via Digitalmars-d-bugs <digitalmars-d-bugs puremagic.com> writes:

https://issues.dlang.org/show_bug.cgi?id=15159

          Issue ID: 15159
           Summary: Static nested function prevent inlining
           Product: D
           Version: D2
          Hardware: x86_64
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody puremagic.com
          Reporter: dmitry.olsh gmail.com

Turns out that even _static_ nested function prevents inlining. Testing on
DMD-v2.069 HEAD.

Test case:

int boo()
{
    pragma(inline, true);
    static int foo(int k){ return k; }
    return foo(1);
}
// needed else it will ignore inliner pass
unittest
{
   assert(boo() == 1);
}

fails:
.\boo.d(1): Error: function boo.boo cannot inline function

While this works:
static int foo(int k){ return k; }

int boo()
{
    pragma(inline, true);
    return foo(1);
}

// needed else it will ignore inliner pass
unittest
{
   assert(boo() == 1);
}

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