https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65010
Peter Bergner <bergner at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |bergner at gcc dot gnu.org
Last reconfirmed|2016-01-27 00:00:00 |2023-3-23
--- Comment #12 from Peter Bergner <bergner at gcc dot gnu.org> ---
(In reply to pthaugen from comment #11)
> Another example to clean up. The back to back constant load/sign extend
> sequence of rtl insns is created in each block by the block reordering pass
> (.bbo) duplicating the common return block.
>
> int foo(int in)
> {
> if (in == 1)
> return 123;
> return 0;
> }
>
>
> foo:
> .LFB0:
> .cfi_startproc
> cmpwi 0,3,1
> beq 0,.L5
> li 3,0
> extsw 3,3
> blr
> .p2align 4,,15
> .L5:
> li 3,123
> extsw 3,3
> blr
Cuurent trunk code for this is now:
foo:
cmpwi 0,3,1
beq 0,.L3
li 3,0
rldicl 3,3,0,32
blr
.p2align 4,,15
.L3:
li 3,123
rldicl 3,3,0,32
blr
It's interested that we seem to have switched from a sign extension to a zero
extension.
