https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86680
--- Comment #11 from Florian La Roche
---
Below my current code that disables optimization for this one function and thus
generates ok code length.
best regards,
Florian La Roche
#if __GNUC__ > 4
#define __gcc_no_ivopts __attribute__ ((opt
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86680
--- Comment #10 from Florian La Roche
---
In my optionion the result of
"end = (__bss_end - __bss_start) * sizeof (unsigned long)"
in my last testcase should show that the compile should be
able to optimize the test code of the original submitte
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86680
--- Comment #9 from Florian La Roche ---
Puh, even introduced an error here. This one works, but is
getting complex compared to the original code:
extern unsigned long __bss_start[];
extern unsigned long __bss_end[];
void clear_bss(void)
{
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86680
--- Comment #8 from Florian La Roche ---
I've found something the compiler optimized quite nicely:
(Good for the compiler, but I'd be happy to stay with the original code
that was much easier to read for humans.)
extern unsigned long __bss_sta
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86680
--- Comment #7 from Florian La Roche ---
Hello Andrew Pinski,
shouldn't the compiler see that both must be aligned to 8 bytes
and thus also their difference must be a multiple of 8 bytes?
I haven't looked into gcc sources, but maybe this inform
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86680
--- Comment #4 from Florian La Roche ---
Right, compiling with "-O2 -fno-ivopts" resolves my issues.
best regards,
Florian La Roche
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86680
--- Comment #3 from Florian La Roche ---
Hello Martin,
I assume the two functions clear_bss1() and clear_bss2() to work on
identical aligned data and produce similar assembler output.
Yet looking at the assembler output, the first function produ
: unassigned at gcc dot gnu.org
Reporter: florian.laroche at googlemail dot com
Target Milestone: ---
Created attachment 4
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=4&action=edit
testcase
I can see this on x86_64 and aarch64. The first function is compiled wi
