https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93176
--- Comment #10 from Jens Seifert <jens.seifert at de dot ibm.com> ---
Looks like no patch in the area got delivered. I did a small test for
unsigned long long c0000FFFF00000000()
{
return 0x0000FFFF00000000ULL;
}
gcc 13.2.0:
li 3,0
ori 3,3,0xffff
sldi 3,3,32
expected:
li 3, -1
rldic 3, 3, 32, 16
All consecutive ones can be created with li + rldic.
The rotate eliminates the bits on the right and the clear the bits on the left
as described below:
li t,-1
rldic d,T,MB,63-ME
