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On 2/7/14, 10:24 AM, Andrew Trick wrote: > > On Feb 5, 2014, at 12:54 AM, Mehdi Amini <mehdi.amini at silkan.com > <mailto:mehdi.amini at silkan.com>> wrote: > >> Hi, >> >> I was looking at some bugs to play with, and I started with >> http://llvm.org/bugs/show_bug.cgi?id=18606 >> >> As I commented there, a loop is unrolled and exhibit this pattern: &gt...

This code is essentially from an LTP test ( http://ltp.sourceforge.net/ <http://ltp.sourceforge.net/> ). #include <stdlib.h> int main() { void *curr; do { curr = malloc(1); } while (curr); return 0; } If you compile it with no optimization, it will keep the malloc calls. If you compile it with -O2, it will create an infinite loop, i.e. assuming that malloc

Hi, I was looking at some bugs to play with, and I started with http://llvm.org/bugs/show_bug.cgi?id=18606 As I commented there, a loop is unrolled and exhibit this pattern: %mul.1 = mul i32 %mul, %mul %mul.2 = mul i32 %mul.1, %mul.1 .... With an unroll factor of 32, the last multiply has 2^32 terms in its SCEV expression. (I mean I expect it would have those terms if I was patient

On 1 October 2012 18:34, reed kotler <rkotler at mips.com> wrote: > This code is essentially from an LTP test ( http://ltp.sourceforge.net/). > > > #include <stdlib.h> > > int main() { > void *curr; > > do { > curr = malloc(1); > } while (curr); > > return 0; > > } > > If you compile it with no optimization, it will keep

...stract location which is tested later by some optimization phases to avoid too much liberal optimizations, like the one above. Anyway, this is an interesting limit case to discuss tonight at the LLVM Bay-area Social. :-) -- Ronan KERYELL |\/ Phone: +1 408 658 9453 SILKAN Wild Systems |/) 4962 El Camino Real #201 K Ronan.Keryell at silkan.com Los Altos, CA 94022 |\ skype:keryell USA | \ http://silkan.com

Hi, Le 02/10/2012 19:29, Hal Finkel a écrit : > On Mon, 01 Oct 2012 22:56:50 -0700 > Chris Lattner <clattner at apple.com> wrote: >> On Oct 1, 2012, at 10:37 PM, Hal Finkel <hfinkel at anl.gov> wrote: >>> On Mon, 01 Oct 2012 21:26:54 -0700 >>> Chris Lattner <clattner at apple.com> wrote: >>>> On Oct 1, 2012, at 6:16 PM, greened at

On Mon, 01 Oct 2012 22:56:50 -0700 Chris Lattner <clattner at apple.com> wrote: > > On Oct 1, 2012, at 10:37 PM, Hal Finkel <hfinkel at anl.gov> wrote: > > > On Mon, 01 Oct 2012 21:26:54 -0700 > > Chris Lattner <clattner at apple.com> wrote: > > > >> > >> On Oct 1, 2012, at 6:16 PM, greened at obbligato.org wrote: > >>