[Bug rtl-optimization/128448] RTL if-converter can produce a better select between x and -1 for RISC-V and perhaps other targets

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128448

Drea Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2026-11-05
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Drea Pinski <pinskia at gcc dot gnu.org> ---
li        a4,33685504
addi      t0,a4,514
slli      a5,t0,32
add       t1,a5,t0
seqz      t2,a2
Neg.      T2,t2
Or.       T1,t2

That is:
-(c==0)|CST

So when c is 0, you get -1 and when c is nonzero you get CST.