https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38497
--- Comment #10 from Andrew Pinski ---
CLANG/LLVM does this while ICC peels off the first iteration of the loop.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38497
Richard Biener changed:
What|Removed |Added
Last reconfirmed|2010-03-03 10:57:32 |2017-6-26
--- Comment #9 from Richard B
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38497
--- Comment #8 from Andrew Pinski ---
(In reply to Richard Biener from comment #5)
> now what is left is hoisting *a_2(D) to after the call. But that's not PRE.
Yes I agree with this but hoisting was added to PRE and we still don't optimize
it
--- Comment #7 from rguenth at gcc dot gnu dot org 2010-05-05 10:30 ---
As *a_2(D) is ANTIC_OUT in bb3 (but not ANTIC_IN in bb3 because it dies in
there)
can we insert in bb3 instead of in bb5?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38497
--- Comment #6 from steven at gcc dot gnu dot org 2010-03-03 14:26 ---
Well, it is not hoisting, either.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38497
--- Comment #5 from rguenth at gcc dot gnu dot org 2010-03-03 11:03 ---
I'm not so sure. We start with
:
plaintextlen_3 = *a_2(D);
:
# i_13 = PHI
D.2725_5 = *a_2(D);
DoHuffIteration (D.2725_5);
i_6 = i_13 + 1;
if (i_6 <= )
goto ;
else
goto ;
:
goto ;
:
--- Comment #4 from steven at gcc dot gnu dot org 2010-03-03 10:57 ---
I think pinskia means we could transform the test case of comment #0 to:
void DoHuffIteration(int);
int f(int *a)
{
int i;
int plaintextlen=*a;
pretmp = plaintextlen;
for(i = 0; i< 1; i++)
{
D
--- Comment #3 from rguenth at gcc dot gnu dot org 2010-03-03 10:43 ---
This isn't PRE but code hoisting which we have a dup for.
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rguenth at gcc dot gnu dot org changed:
What|Removed |Added
---
--- Comment #2 from pinskia at gcc dot gnu dot org 2010-03-02 19:01 ---
Still happens as of today on the trunk.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38497
--- Comment #1 from pinskia at gcc dot gnu dot org 2008-12-11 23:24 ---
This is a reduced testcase from The huffman byte benchmark.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38497
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