https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102162
--- Comment #10 from Andrew Pinski ---
So I looked into this a little bit and it works on aarch64 with -O1
-mstrict-align but if you remove -mstrict-align we get an unaligned access
which I think it is expected.
The gimple level is the same in
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102162
--- Comment #9 from deller at gmx dot de ---
On 9/1/21 11:25 PM, deller at gmx dot de wrote:
> The "ldh" loads only the first two bytes, and extends it into the upper 32bits
> with "extrw,s".
> So, only 16bits instead of 32bits are loaded from
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102162
--- Comment #8 from deller at gmx dot de ---
On 9/1/21 11:19 PM, dave.anglin at bell dot net wrote:
>> I think the problem with your testcase is, that the compiler doesn't know the
>> alignment of the parameter "p" in your f_unaligned()
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102162
--- Comment #7 from dave.anglin at bell dot net ---
On 2021-09-01 4:52 p.m., deller at gmx dot de wrote:
> I think the problem with your testcase is, that the compiler doesn't know the
> alignment of the parameter "p" in your f_unaligned()
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102162
--- Comment #6 from deller at gmx dot de ---
> So, it seems the __aligned__ attribute is ignored:
> extern u32 output_len __attribute__((__aligned__(1)));
I think the aligned attribute is not relevant here. Even
u32 output_len;
will
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102162
--- Comment #5 from dave.anglin at bell dot net ---
On 2021-09-01 4:52 p.m., deller at gmx dot de wrote:
> I think the problem with your testcase is, that the compiler doesn't know the
> alignment of the parameter "p" in your f_unaligned()
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102162
--- Comment #4 from dave.anglin at bell dot net ---
On 2021-09-01 4:14 p.m., arnd at linaro dot org wrote:
> Any idea what the difference is between the working version and your broken
> one?
Not really. My original test case worked as well.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102162
--- Comment #3 from deller at gmx dot de ---
Hi Arnd,
I think the problem with your testcase is, that the compiler doesn't know the
alignment of the parameter "p" in your f_unaligned() function.
So it will generate byte-accesses.
If you
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102162
Arnd Bergmann changed:
What|Removed |Added
CC||arnd at linaro dot org
--- Comment #2
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102162
--- Comment #1 from John David Anglin ---
Created attachment 51395
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51395=edit
Second test case
Changing the optimization of get_unaligned_le32 to 0 results in correct
code generation. We
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