I can answer this with much zeal and vigor. (Or I just wanted to use those two words.)

Use the B::Terse module, I made the following check: 
jeffp@friday [10:44am] parsers #264> perl -MO=Terse
sub a { print 1 }
sub b { print 2 }
$c = a() + b();
- syntax OK
LISTOP (0x13b940) pp_leave
    OP (0x130ef8) pp_enter
    COP (0x13b970) pp_nextstate
    BINOP (0x142ce0) pp_sassign
        BINOP (0x142d00) pp_add [3]
            UNOP (0x142c20) pp_entersub [1]
                UNOP (0x13b9d0) pp_null [141]
                    OP (0x130f58) pp_pushmark
                    UNOP (0x142c40) pp_null [17]
                        GVOP (0x142c60) pp_gv  GV (0x12dbac) *a
            UNOP (0x142d20) pp_entersub [2]
                UNOP (0x13ba90) pp_null [141]
                    OP (0x130f70) pp_pushmark
                    UNOP (0x142d40) pp_null [17]
                        GVOP (0x142d60) pp_gv  GV (0x14bbc4) *b
        UNOP (0x12ea00) pp_null [15]
            GVOP (0xbed00) pp_gvsv  GV (0xc6304) *c

[download]
Yes, Perl will call a() before it calls b(). That's why you can safely say: ($a,$b) = (shift, shift) to get the first two values from @_, IN THE RIGHT ORDER. (But you'd use splice(), really.)

In reply to Re: order of evaluation of operands by japhy
in thread order of evaluation of operands by jlistf

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