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combine: Don't create REG_UNUSED notes if the reg already died (PR99927)
authorSegher Boessenkool <segher@kernel.crashing.org>
Sat, 17 Apr 2021 18:06:17 +0000 (18:06 +0000)
committerSegher Boessenkool <segher@kernel.crashing.org>
Mon, 19 Jul 2021 17:12:11 +0000 (17:12 +0000)
commit7ef9f0272258862439348dbaa57a46e9eabdc9ca
tree4e160fc19f0939fe45c02fc265a07dbc3f7828fftree
parent3cb07a1606087daa34b3b26e33903b345809e700commit | diff
combine: Don't create REG_UNUSED notes if the reg already died (PR99927)

If the register named in an existing REG_UNUSED note dies somewhere
between where the note used to be and I3, we should just drop it.

2021-04-21  Segher Boessenkool  <segher@kernel.crashing.org>

PR rtl-optimization/99927
* combine.c (distribute_notes) [REG_UNUSED]: If the register already
is dead, just drop it.
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