[Bug target/94482] Inserting into vector with optimization enabled on x86 generates incorrect result

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94482

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |6.4.0
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #9 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Evan Nemerson from comment #8)
> Created attachment 48204 [details]
> Reduced test case, ASan/UBSan clean
> 
> Here is the reduced test case which works with -fsanitize=address,undefined
> -Wno-psabi -Wall -Werror.
> 
> This one is self-contained, and instead of using assert the return value is
> 0 on success and 1 on failure.

Thank you.
The git bisection revisions remain the same for the reduced test-case.
Isn't the problem right now the violation of -Wpsabi?

pr94482-v2.c: In function ‘s’:
pr94482-v2.c:8:1: warning: SSE vector return without SSE enabled changes the
ABI [-Wpsabi]
    8 | l s(__INT64_TYPE__ a) {
      | ^
pr94482-v2.c: In function ‘p’:
pr94482-v2.c:16:3: note: the ABI for passing parameters with 16-byte alignment
has changed in GCC 4.6
   16 | l p(l a, __INT64_TYPE__ i, int q) {
      |   ^
pr94482-v2.c:16:3: warning: SSE vector argument without SSE enabled changes the
ABI [-Wpsabi]