On Wed, Dec 18, 2024 at 12:59:11AM -0300, Alexandre Oliva wrote:
> * gcc.dg/field-merge-16.c: New.
Note the test FAILs on i686-linux or on x86_64-linux with -m32. The IL
is identical before ifcombine, but -m64 to -m32 ifcombine dump shows
-optimizing two comparisons to (_10 & 18446462598732
> Am 18.12.2024 um 05:00 schrieb Alexandre Oliva :
>
> When a loaded field is sign extended, masked and compared, we used to
> drop from the mask the bits past the original field width, which is
> not correct.
>
> Take note of the fact that the mask covered copies of the sign bit,
> before cl
