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cmd/compile: rework handling of udiv on ARM

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Instead of populating the aux symbol
of CALLudiv during rewrite rules,
populate it during genssa.

This simplifies the rewrite rules.
It also removes all remaining calls
to ctxt.Lookup from any rewrite rules.
This is a first step towards removing
ctxt from ssa.Cache entirely,
and also a first step towards converting
the obj.LSym.Version field into a boolean.
It should also speed up compilation.

Also, move func udiv into package runtime.
That's where it is anyway,
and it lets udiv look and act like the rest of
the runtime support functions.

Change-Id: I41462a632c14fdc41f61b08049ec13cd80a87bfe
Reviewed-on: https://go-review.googlesource.com/41191
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This commit is contained in:
Josh Bleecher Snyder 2017-04-20 07:50:17 -07:00
parent 6e97c71cb7
commit 01b1a34aac
9 changed files with 27 additions and 38 deletions
Download patch file Download diff file Expand all files Collapse all files

5
src/cmd/compile/internal/arm/ssa.go
View file

@ -622,7 +622,10 @@ func ssaGenValue(s *gc.SSAGenState, v *ssa.Value) {
p.From.Offset = v.AuxInt
p.To.Type = obj.TYPE_REG
p.To.Reg = v.Reg()
case ssa.OpARMCALLstatic, ssa.OpARMCALLclosure, ssa.OpARMCALLinter, ssa.OpARMCALLudiv:
case ssa.OpARMCALLstatic, ssa.OpARMCALLclosure, ssa.OpARMCALLinter:
s.Call(v)
case ssa.OpARMCALLudiv:
v.Aux = gc.Udiv
s.Call(v)
case ssa.OpARMDUFFZERO:
p := s.Prog(obj.ADUFFZERO)