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I was a bit surprised when my newly-added define_peephole2 didn't match, but it was because it was expected to partially match the generated output of a previous define_peephole2, which matched and modified the last insn of a sequence to be matched. I had assumed that the algorithm backed-up the size of the match-buffer, thereby exposing newly created opportunities *with sufficient context* to all define_peephole2's. While things can change in that direction, let's start with documenting the current state. * doc/md.texi (define_peephole2): Document order of scanning.
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