[Bug c/44376] optimiser destroys possibility of detecting overflow

[geoff at dyalog dot com]

------- Comment #1 from geoff at dyalog dot com  2010-06-02 11:09 -------
Created an attachment (id=20807)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20807&action=view)
example code to demonstrate bug

extract code using "cpio -i <code.cpio"
gcc -m64 -O3 main.c slave.c -lc
./a.out

If in slave.c you make totwidth volatile then the code works correctly.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44376