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| author | Richard Musiol <mail@richard-musiol.de> | 2019-03-24 12:14:27 +0100 |
|---|---|---|
| committer | Richard Musiol <neelance@gmail.com> | 2019-04-04 16:10:12 +0000 |
| commit | cf8cc7f63c7ddefb666a6e8d99a4843d3277db9f (patch) | |
| tree | edc59cd956160ff6683a60e8848cacf841a20a3b /src/cmd/internal/objabi | |
| parent | 1abf3aa55bb8b346bb1575ac8db5022f215df65a (diff) | |
| download | go-cf8cc7f63c7ddefb666a6e8d99a4843d3277db9f.tar.xz | |
cmd/compile: add saturating conversions on wasm
This change adds the GOWASM option "satconv" to enable the generation
of experimental saturating (non-trapping) float-to-int conversions.
It improves the performance of the conversion by 42%.
Previously the conversions had already been augmented with helper
functions to have saturating behavior. Now Wasm.rules is always using
the new operation names and wasm/ssa.go is falling back to the helpers
if the feature is not enabled.
The feature is in phase 4 of the WebAssembly proposal process:
https://github.com/WebAssembly/meetings/blob/master/process/phases.md
More information on the feature can be found at:
https://github.com/WebAssembly/nontrapping-float-to-int-conversions/blob/master/proposals/nontrapping-float-to-int-conversion/Overview.md
Change-Id: Ic6c3688017054ede804b02b6b0ffd4a02ef33ad7
Reviewed-on: https://go-review.googlesource.com/c/go/+/170119
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Diffstat (limited to 'src/cmd/internal/objabi')
| -rw-r--r-- | src/cmd/internal/objabi/util.go | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/cmd/internal/objabi/util.go b/src/cmd/internal/objabi/util.go index 02f9d9273a..e28447d141 100644 --- a/src/cmd/internal/objabi/util.go +++ b/src/cmd/internal/objabi/util.go @@ -79,10 +79,14 @@ func goppc64() int { type gowasmFeatures struct { SignExt bool + SatConv bool } func (f *gowasmFeatures) String() string { var flags []string + if f.SatConv { + flags = append(flags, "satconv") + } if f.SignExt { flags = append(flags, "signext") } @@ -92,6 +96,8 @@ func (f *gowasmFeatures) String() string { func gowasm() (f gowasmFeatures) { for _, opt := range strings.Split(envOr("GOWASM", ""), ",") { switch opt { + case "satconv": + f.SatConv = true case "signext": f.SignExt = true case "": |