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very confused about single_set
- From: Kenneth Zadeck <zadeck at naturalbridge dot com>
- To: Steven Bosscher <stevenb dot gcc at gmail dot com>, "Berlin, Daniel" <dberlin at dberlin dot org>, Zdenek Dvorak <rakdver at atrey dot karlin dot mff dot cuni dot cz>, GCC <gcc at gcc dot gnu dot org>
- Date: Sun, 19 Feb 2006 09:56:23 -0500
- Subject: very confused about single_set
Steven, Zdenek
1) single_set is built on top of single_set2.
2) single_set_2 uses REG_UNUSED notes.
3) tree-ssa-loop-ivops.c:seq_cost uses single_set.
I can find no indication that rtl dfa is run here to provide the
information for single_set to produce the correct answer.
Inquiring minds want to know.
Kenny