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| author | Paul E. Murphy <murp@ibm.com> | 2020-08-20 15:06:23 -0500 |
|---|---|---|
| committer | Lynn Boger <laboger@linux.vnet.ibm.com> | 2020-08-27 20:10:15 +0000 |
| commit | 7615b20d06500fe5c95c061f6ff32e0c97639a60 (patch) | |
| tree | 6c9b3f6f529db38b69d45dc915a5e32fd0e478cf /src/cmd/compile/internal/ppc64 | |
| parent | 2013f70256e55f5f6f826757333aae42b4667561 (diff) | |
| download | go-7615b20d06500fe5c95c061f6ff32e0c97639a60.tar.gz go-7615b20d06500fe5c95c061f6ff32e0c97639a60.zip | |
cmd/compile: generate subfic on ppc64
This merges an lis + subf into subfic, and for 32b constants
lwa + subf into oris + ori + subf.
The carry bit is no longer used in code generation, therefore
I think we can clobber it as needed. Note, lowered borrow/carry
arithmetic is self-contained and thus is not affected.
A few extra rules are added to ensure early transformations to
SUBFCconst don't trip up earlier rules, fold constant operations,
or otherwise simplify lowering. Likewise, tests are added to
ensure all rules are hit. Generic constant folding catches
trivial cases, however some lowering rules insert arithmetic
which can introduce new opportunities (e.g BitLen or Slicemask).
I couldn't find a specific benchmark to demonstrate noteworthy
improvements, but this is generating subfic in many of the default
bent test binaries, so we are at least saving a little code space.
Change-Id: Iad7c6e5767eaa9dc24dc1c989bd1c8cfe1982012
Reviewed-on: https://go-review.googlesource.com/c/go/+/249461
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Carlos Eduardo Seo <cseo@linux.vnet.ibm.com>
Diffstat (limited to 'src/cmd/compile/internal/ppc64')
| -rw-r--r-- | src/cmd/compile/internal/ppc64/ssa.go | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ppc64/ssa.go b/src/cmd/compile/internal/ppc64/ssa.go index 9c4c01e935..f8d9ac2379 100644 --- a/src/cmd/compile/internal/ppc64/ssa.go +++ b/src/cmd/compile/internal/ppc64/ssa.go @@ -649,6 +649,14 @@ func ssaGenValue(s *gc.SSAGenState, v *ssa.Value) { p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() + case ssa.OpPPC64SUBFCconst: + p := s.Prog(v.Op.Asm()) + p.SetFrom3(obj.Addr{Type: obj.TYPE_CONST, Offset: v.AuxInt}) + p.From.Type = obj.TYPE_REG + p.From.Reg = v.Args[0].Reg() + p.To.Type = obj.TYPE_REG + p.To.Reg = v.Reg() + case ssa.OpPPC64ANDCCconst: p := s.Prog(v.Op.Asm()) p.Reg = v.Args[0].Reg() |