https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101200
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|tree-optimization |rtl-optimization
Keywords| |missed-optimization
Severity|normal |enhancement
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This does not make sense:
Trying 12 -> 14:
12: {r93:QI=r82:QI 0>>0x4;clobber flags:CC;}
REG_DEAD r82:QI
REG_UNUSED flags:CC
14: {r95:DI=r93:QI#0&0xf;clobber flags:CC;}
REG_UNUSED flags:CC
REG_DEAD r93:QI
Failed to match this instruction:
(parallel [
(set (reg:DI 95 [ a ])
(zero_extract:DI (subreg:HI (reg:QI 82 [ d.0_1 ]) 0)
(const_int 4 [0x4])
(const_int 4 [0x4])))
(clobber (reg:CC 17 flags))
])
How can you have a subreg of HI and then get a zero_extract of DI?
