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cmd/compile: intrinsics for trunc, floor, ceil on ppc64x

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This implements trunc, floor, and ceil in the math package
as intrinsics on ppc64x.  Significant improvement mainly due
to avoiding call overhead of args and return value.

BenchmarkCeil-16                    5.95          0.69          -88.40%
BenchmarkFloor-16                   5.95          0.69          -88.40%
BenchmarkTrunc-16                   5.82          0.69          -88.14%

Updates #21390

Change-Id: I951e182694f6e0c431da79c577272b81fb0ebad0
Reviewed-on: https://go-review.googlesource.com/54654
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Carlos Eduardo Seo <cseo@linux.vnet.ibm.com>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Lynn Boger 2017-08-09 13:53:34 -04:00
parent 3cb41be817
commit 0f19e24da7
7 changed files with 125 additions and 2 deletions
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5
src/cmd/compile/internal/ssa/gen/genericOps.go
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@ -255,7 +255,10 @@ var genericOps = []opData{
{name: "PopCount32", argLength: 1}, // Count bits in arg[0]
{name: "PopCount64", argLength: 1}, // Count bits in arg[0]
{name: "Sqrt", argLength: 1}, // sqrt(arg0), float64 only
{name: "Sqrt", argLength: 1}, // sqrt(arg0), float64 only
{name: "Floor", argLength: 1}, // floor(arg0), float64 only
{name: "Ceil", argLength: 1}, // ceil(arg0), float64 only
{name: "Trunc", argLength: 1}, // trunc(arg0), float64 only
// Data movement, max argument length for Phi is indefinite so just pick
// a really large number