GC.malloc is pure - wat

[anonymous via Digitalmars-d]

On Friday, 24 April 2015 at 15:29:59 UTC, Marc Schütz wrote:
> auto a = sin(x) * sin(x);    // sin() is called only once

Could you give a complete example of when this is done?

Two calls here (ldc2 -c -O):

real grepme(real x) pure
{
     import std.math;
     auto a = sin(x) * sin(x);
     return a;
}

0000000000000000 <_D4test6grepmeFNaeZe>:
    0:   48 83 ec 28             sub    rsp,0x28
    4:   db 6c 24 30             fld    TBYTE PTR [rsp+0x30]
    8:   d9 c0                   fld    st(0)
    a:   db 7c 24 10             fstp   TBYTE PTR [rsp+0x10]
    e:   db 3c 24                fstp   TBYTE PTR [rsp]
   11:   e8 00 00 00 00          call   16 
<_D4test6grepmeFNaeZe+0x16>
   16:   db 7c 24 1c             fstp   TBYTE PTR [rsp+0x1c]
   1a:   db 6c 24 10             fld    TBYTE PTR [rsp+0x10]
   1e:   db 3c 24                fstp   TBYTE PTR [rsp]
   21:   e8 00 00 00 00          call   26 
<_D4test6grepmeFNaeZe+0x26>
   26:   db 6c 24 1c             fld    TBYTE PTR [rsp+0x1c]
   2a:   de c9                   fmulp  st(1),st
   2c:   48 83 c4 28             add    rsp,0x28
   30:   c3                      ret