means that we only care about the low bits of the result.
However, on most machines (those with neither BYTE_LOADS_ZERO_EXTEND
- nor BYTES_LOADS_SIGN_EXTEND defined), we cannot perform a
+ nor BYTE_LOADS_SIGN_EXTEND defined), we cannot perform a
narrower operation that requested since the high-order bits will
be undefined. On machine where BYTE_LOADS_*_EXTEND is defined,
however, this transformation is safe as long as M1 and M2 have