https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112098
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Trying 6, 7, 8 -> 9:
6: {r105:SI=r108:SI 0>>0x9;clobber flags:CC;}
REG_DEAD r108:SI
REG_UNUSED flags:CC
7: {r106:SI=r105:SI&0x1;clobber flags:CC;}
REG_DEAD r105:SI
REG_UNUSED flags:CC
8: {r107:SI=r106:SI^0x1;clobber flags:CC;}
REG_DEAD r106:SI
REG_UNUSED flags:CC
9: {r103:SI=r107:SI<<0x4;clobber flags:CC;}
REG_DEAD r107:SI
REG_UNUSED flags:CC
Failed to match this instruction:
(parallel [
(set (reg:SI 103)
(and:SI (lshiftrt:SI (xor:SI (reg:SI 108)
(const_int 512 [0x200]))
(const_int 5 [0x5]))
(const_int 16 [0x10])))
(clobber (reg:CC 17 flags))
])
The xor here maybe should have been not. But I can't remember if we allow 4->3
combining or just 4->2.
