[Bug rtl-optimization/108826] Inefficient address generation on POWER

[kishan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108826

--- Comment #16 from Kishan Parmar <kishan at gcc dot gnu.org> ---

(In reply to Kishan Parmar from comment #11)

> 239 (set (reg:DI 130)
> 240     (plus:DI (and:DI (ashift:DI (lshiftrt:DI (subreg:DI (reg:SI 125 [
> var ]) 0)
> 241                     (const_int 6 [0x6]))
> 242                 (const_int 2 [0x2]))
> 243             (const_int 20 [0x14]))
> 244         (const_int 800 [0x320])))
> 

After simplifying above expression to 

> 239 (set (reg:DI 130)
> 240     (plus:DI (and:DI (lshiftrt:DI (subreg:DI (reg:SI 125 [ var ]) 0)
> 241                 (const_int 4 [0x4]))
> 242             (const_int 20 [0x14]))
> 243         (const_int 800 [0x320])))
> 

We can split above insn.
Basically,

9 : B = A >> 6
11: C = B & 5
13: D = C + 200
14: E = D << 2

Can be transformed to,

B = A >> 4
C = B & 20
D = C + 800