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cmd/compile: move constant divide strength reduction to SSA rules

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Currently the conversion from constant divides to multiplies is mostly
done during the walk pass.  This is suboptimal because SSA can
determine that the value being divided by is constant more often
(e.g. after inlining).

Change-Id: If1a9b993edd71be37396b9167f77da271966f85f
Reviewed-on: https://go-review.googlesource.com/37015
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
This commit is contained in:
Keith Randall 2017-02-13 16:00:09 -08:00
parent 794f1ebff7
commit 708ba22a0c
26 changed files with 2469 additions and 819 deletions
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1
src/cmd/compile/fmt_test.go
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@ -596,6 +596,7 @@ var knownFormats = map[string]string{
"*cmd/internal/obj.Prog %s": "",
"*cmd/internal/obj.Prog %v": "",
"*math/big.Int %#x": "",
"*math/big.Int %s": "",
"[16]byte %x": "",
"[]*cmd/compile/internal/gc.Node %v": "",
"[]*cmd/compile/internal/gc.Sig %#v": "",