Displaying 3 results from an estimated 3 matches for "0aint".
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saint
2018 Apr 03
1
Ineffective code after loop unrolling with -O3, ok with -Os
...bilities of
LLVM's opt.
Seems like LLVM generates slower code with -O3 since it wrongly decides to
unroll a simple loop.
With option -Os, no loop unrolling, the output looks well.
Code:
https://godbolt.org/#g:!((g:!((g:!((h:codeEditor,i:(j:1,lang:c%2B%2B,source:'%23include+%3Ccstdio%3E%0A%0Aint+f(void)%0A%7B%0A++int+n+%3D+100%3B%0A++while+(--n)+%7B%0A++++++puts(%22a%22)%3B%0A++%7D%0A++return+0%3B%0A%7D%0A%0Aint+main(void)+%7B%0A++++f()%3B%0A++++return+0%3B%0A%7D'),l:'5
',n:'0',o:'C%2B%2B+source+%231',t:'0')),k:33.61947345592715,l:'4',n:'0...
2020 Jul 10
2
Understand alias-analysis results
...t _value_ we obtain from pointer `x` by dereferencing it
`*x`, but that bears no relevance to aliasing here). Perhaps this can
help illustrate the scenario (assuming the URL doesn't get mangled):
http://www.pythontutor.com/cpp.html#code=void%20MUSTALIAS%28void%20*p,%20void%20*q%29%20%7B%7D%0A%0Aint%20main%28%29%7B%0A%0A%20%20int%20**a,%20*b,%20*x%20,c%3B%0A%20%20c%20%3D%2010%3B%0A%20%20a%20%3D%20%26b%3B%0A%20%20b%20%3D%20%26c%3B%0A%20%20x%20%3D%20*a%3B%0A%20%20int%20y%20%3D%20*x%3B%0A%20%20MUSTALIAS%28x,%26c%29%3B%0A%20%20MUSTALIAS%28x,b%29%3B%0A%20%20return%200%3B%0A%7D&curInstr=12&m...
2020 Jul 09
2
Understand alias-analysis results
Hi again!
Replying in chronological order:
> On Thu, Jul 9, 2020 at 6:51 PM Shuai Wang <wangshuai901 at gmail.com
> <mailto:wangshuai901 at gmail.com>> wrote:
>
> Hey Matt,
>
> That's awesome. Thank you very much for all the information and
> clarification! Just a few follow up questions. Could you kindly shed
> some lights on it? Thank