[fpc-devel] Incomplete docs on operator precedence / Question about actual precedence

[Martin Frb]

On 03/02/2014 10:48, Sven Barth wrote:
>
> So unary minus (and also unary plus which is a valid operator as 
> well!) binds stronger than multiplication.

Just using -al

c := -a *b;
c := (-a) *b;
c := -(a *b);

The unary - is applied first. Though it makes no difference to the result.

However with the overloaded operators, it may make a difference....

# [22] c := -a *b;
     movl    U_P$PROJECT1_A,%eax
     negl    %eax
     movl    U_P$PROJECT1_B,%edx
     imull    %edx,%eax
     movl    %eax,U_P$PROJECT1_C
.Ll8:
# [23] c := (-a) *b;
     movl    U_P$PROJECT1_A,%eax
     negl    %eax
     movl    U_P$PROJECT1_B,%edx
     imull    %edx,%eax
     movl    %eax,U_P$PROJECT1_C
.Ll9:
# [24] c := -(a *b);
     movl    U_P$PROJECT1_A,%eax
     movl    U_P$PROJECT1_B,%edx
     imull    %edx,%eax
     negl    %eax
     movl    %eax,U_P$PROJECT1_C