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Richard Earnshaw f6af9c21fd [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.

	PR target/91386
	* config/aarch64/aarch64.c (aarch64_gen_adjusted_ldpstp): Use copy_rtx
	to preserve the contents of the original insns.

From-SVN: r274238
2019-08-09 16:14:59 +00:00
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gcc [aarch64] PR target/91386 Use copy_rtx to avoid modifying original insns in peep2 pattern 2019-08-09 16:14:59 +00:00
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