Hello, This is a followup on a suggestion made along the thread at
http://gcc.gnu.org/ml/gcc-patches/2010-09/msg00967.html where we were observing the middle-end setting invalid REG_EQUIV notes on set(mem) insns. At the time we had fixed specific locations where this was happening via explicit calls to set_unique_reg_note. Steven suggested to add some code to set_unique_reg_note as well. This patch implements this suggestion. We (AdaCore) have been using it without problem for a while now, it turned out useful to prevent a real case in the gcc-4.5 series and we never saw the original issue resurface again since then. Bootstrapped and regtested on x86_64-suse-linux OK to commit ? Thanks in advance, With Kind Regards, Olivier 2012-04-12 Olivier Hainque <hain...@adacore.com> * emit-rtl.c (set_unique_reg_note): Don't add REG_EQUAL or REG_EQUIV on a SET if the destination isn't a REG or a SUBREG of REG.