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In d8487c949ad5, MODE_PARTIAL_INT modes were changed from having an unknown number of undefined bits, to having a known number of undefined bits, however the documentation on using SUBREG expressions with MODE_PARTIAL_INT modes was not updated to reflect this. gcc/ChangeLog: * doc/rtl.texi (subreg): Fix documentation to state there is a known number of undefined bits in regs and subregs of MODE_PARTIAL_INT modes.
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