r242414, for PR77881, introduces some bugs (PR78390, PR78438, PR78477). It all has the same root cause: that patch makes combine convert every lowpart subreg of a logical shift right to a zero_extract. This cannot work at all if it is not a constant shift, and it has to be a bit more careful exactly which bits it extracts. PR target/77881 PR bootstrap/78390 PR target/78438 PR bootstrap/78477 * combine.c (make_compound_operation_int): Do not convert a subreg of a non-constant logical shift right to a zero_extract. Handle the case where some zero bits have been shifted into the range covered by that subreg. From-SVN: r242757
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