Re: [sdcc-devel] How are local variables initialized ?

[Philipp K. K. <pk...@sp...>]

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Am 07.01.2014 12:58, schrieb Ben Shi:
> Hello,
> 
> The dumped AST info for int add(int a, int b) { int s = 1; s += a +
> b; return s; } is
> 
>> FUNCTION (_add=0x8b63770) type (int fixed) args (int fixed, int
>> fixed) (null):0:{ L1 B0 (null):0:  DECLARE SYMBOL (L1 B1
>> a=0x8b63138) type (int fixed) (null):0:  DECLARE SYMBOL (L1 B2
>> s=0x8b61b28) type (int fixed) a.c:4:  ASSIGN(=) (0x8b62cd0) type
>> (int fixed) a.c:4:    SYMBOL (L1 B2 s=0x8b62970 @ 0x8b61b28) type
>> (int fixed) a.c:4:    ADD (0x8b62c78) type (int fixed) a.c:4:
>> SYMBOL (L1 B2 s=0x8b622b0 @ 0x8b61b28) type (int fixed) a.c:4:
>> ADD (0x8b62918) type (int fixed) a.c:4:        SYMBOL (L1 B1
>> a=0x8b625b8 @ 0x8b61018) type (int fixed) a.c:4:        SYMBOL
>> (L1 B1 b=0x8b628c0 @ 0x8b61398) type (int fixed) a.c:5:  RETURN
>> (0x8b63030) type (int fixed) a.c:5:    SYMBOL (L1 B2 s=0x8b62fd8
>> @ 0x8b61b28) type (int fixed) (null):0:}
> 
> But how is s initialized to 1 ? Should there be an ASSIGN(=) for
> that ?
> 
> Ben

Looks to me as if

s = 1;
s += a + b;

has already been replaced by

s = 1 + (a + b);

Philipp


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