[Bug target/87330] ICE in scan_rtx_reg, at regrename.c:1097

[sameerad at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87330

--- Comment #6 from sameerad at gcc dot gnu.org ---
Created attachment 44814
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44814&action=edit
the regrename pass does not rename the registers which are in notes, because of
which the REG_DEAD note had previous regname, which caused conflicting
information generated for tag collision pass.

It is better to do it in regrename_do_replace instead while
regrename_analyze, because the note information does not really
contribute into the regrename analysis, hence need not be added in the
def-use chains that are computed. regrename_do_replace is where the
decision to finally rename the register is made - where the note can
be altered with new regname.

Other notes need not be changed, as they don't hold renamed register
information.