There is no requirement on the mode of the location operand, so any
supported integer mode is valid. We can relax extract location
operand mode requirement of other patterns involving zero_extract RTX.
2023-02-15 Uroš Bizjak
gcc/ChangeLog:
* config/i386/i386.md (*cmpqi_ext_1): Use
in
Combine pass simplifies zero-extend of a zero-extract to:
Trying 16 -> 6:
16: r86:QI#0=zero_extract(r87:HI,0x8,0x8)
REG_DEAD r87:HI
6: r84:SI=zero_extend(r86:QI)
REG_DEAD r86:QI
Failed to match this instruction:
(set (reg:SI 84 [ s.e2 ])
(zero_extract:SI (reg:HI 87)
