A wild guess. The code needs the return value of second printf as its
return value, if 2nd printf is the last statement.
2010/10/6 Fred Chow <frdc...@gmail.com>:
> We just generate the WHIRL according to what is given to us in GNU
> tree/spin. So it is GNU's C front-end that has this discrepancy.
>
> Fred
>
> On 10/06/2010 01:34 AM, "C. Bergström" wrote:
>> I'm forwarding this question..
>>
>> ELSE block removed to shorten the example..
>> ----------
>>
>> when I have code like this:
>>
>> int i = rand();
>> printf("i = %i\n", i);
>> if (i)
>> printf("i = %i\n", i);
>>
>> (a subset of ) the generated whirl code is:
>>
>> U8LDA 0<1,44,(8_bytes)_"i_=_%i\n\000"> T<50,anon_ptr.,8>
>> U8PARM 2 T<44,anon_ptr.,8> # by_value
>> I4I4LDID 0<2,3,i> T<4,.predef_I4,4>
>> I4PARM 2 T<4,.predef_I4,4> # by_value
>> VCALL 126<1,43,printf> # flags 0x7e
>>
>> IF
>> I4I4LDID 0<2,3,i> T<4,.predef_I4,4>
>> I4INTCONST 0 (0x0)
>> I4I4NE
>> THEN
>> BLOCK
>> BLOCK
>> U8LDA 0<1,44,(8_bytes)_"i_=_%i\n\000"> T<50,anon_ptr.,8>
>> U8PARM 2 T<44,anon_ptr.,8> # by_value
>> I4I4LDID 0<2,3,i> T<4,.predef_I4,4>
>> I4PARM 2 T<4,.predef_I4,4> # by_value
>> I4CALL 126<1,43,printf> # flags 0x7e
>> END_BLOCK
>> I4I4LDID -1<1,40,.preg_return_val> T<4,.predef_I4,4>
>> I4COMMA
>> EVAL
>> END_BLOCK
>>
>>
>> What I don't understand is why there is a difference between the first and
>> second
>> printf calls. The second call is loading the return value of the function
>> being
>> called while the second one ignores that. It also enforces evaluation via
>> eval node. Why? What is the difference between plain printf() and printf()
>> in if-block ?
>>
>> ---------
>>
>> Thanks
>>
>> ./C
>>
>> ------------------------------------------------------------------------------
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>>
>
>
> ------------------------------------------------------------------------------
> Beautiful is writing same markup. Internet Explorer 9 supports
> standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3.
> Spend less time writing and rewriting code and more time creating great
> experiences on the web. Be a part of the beta today.
> http://p.sf.net/sfu/beautyoftheweb
> _______________________________________________
> Open64-devel mailing list
> Open64-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/open64-devel
>
--
Thanks.
Handong
------------------------------------------------------------------------------
Beautiful is writing same markup. Internet Explorer 9 supports
standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3.
Spend less time writing and rewriting code and more time creating great
experiences on the web. Be a part of the beta today.
http://p.sf.net/sfu/beautyoftheweb
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