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On Thu, Mar 21, 2019 at 11:19:54PM +0100, Allan Sandfeld Jensen wrote:
> Hmm, I am curious. How strongly would gcc assume x is 0?
If x is not 0, then it is undefined behavior and anything can happen,
so yes, it can assume x is 0, sometimes gcc does that, sometimes not,
it is not required to do tha
On Montag, 11. März 2019 10:14:49 CET Jakub Jelinek wrote:
> On Mon, Mar 11, 2019 at 08:49:30AM +, Moritz Strübe wrote:
> > Considering that C11 6.5.7#3 ("If the value of the right operand
> > is negative or is greater than or equal to the width of the promoted
> > left operand, the be
On 3/21/19 8:53 AM, Moritz Strübe wrote:
> Hey.
>
> Am 20.03.2019 um 18:36 schrieb Andrew Haley:
>> On 3/20/19 2:08 PM, Moritz Strübe wrote:
>>> Ok, I played around a bit. Interestingly, if I set
>>> -fsanitize=udefined and -fsanitize-undefined-trap-on-error the
>>> compiler detects that it will a
On Thu, 21 Mar 2019 at 09:11, Justin Paston-Cooper
wrote:
>
> On Thu, 21 Mar 2019 at 08:23, Richard Biener
> wrote:
> >
> > On Wed, Mar 20, 2019 at 8:05 PM Tom Tromey wrote:
> > >
> > > > "Segher" == Segher Boessenkool writes:
> > >
> > > >> Section 6.2.5.2 outlines the line number informa
On Thu, 21 Mar 2019 at 08:23, Richard Biener wrote:
>
> On Wed, Mar 20, 2019 at 8:05 PM Tom Tromey wrote:
> >
> > > "Segher" == Segher Boessenkool writes:
> >
> > >> Section 6.2.5.2 outlines the line number information state machine's
> > >> opcodes. One of them is "DW_LNS_set_epilogue_begin
Hey.
Am 20.03.2019 um 18:36 schrieb Andrew Haley:
> On 3/20/19 2:08 PM, Moritz Strübe wrote:
>> Ok, I played around a bit. Interestingly, if I set
>> -fsanitize=udefined and -fsanitize-undefined-trap-on-error the
>> compiler detects that it will always trap, and optimizes the code
>> accordingly (
On Thu, Mar 21, 2019 at 9:25 AM Alexander Monakov wrote:
>
> On Thu, 21 Mar 2019, Richard Biener wrote:
> > > Maybe an example would help.
> > >
> > > Consider this code:
> > >
> > > for (int i = start; i < limit; i++) {
> > > foo(i * 5);
> > > }
> > >
> > > Should GCC be entitled to turn it int
On Thu, 21 Mar 2019, Richard Biener wrote:
> > Maybe an example would help.
> >
> > Consider this code:
> >
> > for (int i = start; i < limit; i++) {
> > foo(i * 5);
> > }
> >
> > Should GCC be entitled to turn it into
> >
> > int limit_tmp = i * 5;
> > for (int i = start * 5; i < limit_tmp; i +=
On Wed, Mar 20, 2019 at 8:05 PM Tom Tromey wrote:
>
> > "Segher" == Segher Boessenkool writes:
>
> >> Section 6.2.5.2 outlines the line number information state machine's
> >> opcodes. One of them is "DW_LNS_set_epilogue_begin". Its definition
> >> is:
>
> Segher> How should this work with sh
On Wed, Mar 20, 2019 at 6:36 PM Andrew Haley wrote:
>
> On 3/20/19 2:08 PM, Moritz Strübe wrote:
> >
> > Ok, I played around a bit. Interestingly, if I set
> > -fsanitize=udefined and -fsanitize-undefined-trap-on-error the
> > compiler detects that it will always trap, and optimizes the code
> > a
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