https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91386
--- Comment #23 from Richard Earnshaw <rearnsha at gcc dot gnu.org> --- Author: rearnsha Date: Mon Aug 19 16:11:30 2019 New Revision: 274675 URL: https://gcc.gnu.org/viewcvs?rev=274675&root=gcc&view=rev Log: [aarch64] PR target/91386 Use copy_rtx to avoid modifying original insns in peep2 pattern PR target/91386 is a situation where a peephole2 pattern substitution is discarded late because the selected instructions contain frame-related notes that we cannot redistribute (because the pattern has more than one insn in the output). Unfortunately, the original insns were being modified during the generation, so after the undo we are left with corrupt RTL. We avoid this by ensuring that the modifications are always made on a copy, so that the original insns are never changed. Backport from mainline 2019-09-09 Richard Earnshaw <rearn...@arm.com> PR target/91386 * config/aarch64/aarch64.c (aarch64_gen_adjusted_ldpstp): Use copy_rtx to preserve the contents of the original insns. Modified: branches/gcc-9-branch/gcc/ChangeLog branches/gcc-9-branch/gcc/config/aarch64/aarch64.c
