Public bug reported:
I think gcc (4.6.3-1ubuntu5, amd64) generates incorrect code with the
attached test case.
The expected output is "m = 8241071186". However, when compiled with
"-O3", it outputs "m = 1". Looking further, it seems that the following
lines:
*m = 1UL;
ularith_div_2ul_ul_ul_r (m, 0UL, 1UL, s);
are being swapped in the assembly output.
The output is correct when compiled with "-O2" or with "-O3 -fno-tree-
cselim".
On Debian (version 4.6.3-1), the output is always correct. I have
reports that the output is correct with upstream gcc compiled on Ubuntu,
so this behaviour looks Ubuntu-specific.
** Affects: gcc-4.6 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1029454
Title:
cselim tree optimizer generates incorrect code
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