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cmd/compile: add sign-extension operators on wasm

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This change adds the GOWASM option "signext" to enable
the generation of experimental sign-extension operators.

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/sign-extension-ops/blob/master/proposals/sign-extension-ops/Overview.md

Change-Id: I6b30069390a8699fbecd9fb4d1d61e13c59b0333
Reviewed-on: https://go-review.googlesource.com/c/go/+/168882
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Richard Musiol 2019-03-23 15:25:42 +01:00 • committed by Richard Musiol
parent d23bf3daa9
commit 4d23cbc671
12 changed files with 151 additions and 7 deletions
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2
src/cmd/internal/obj/wasm/wasmobj.go
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@ -886,7 +886,7 @@ func assemble(ctxt *obj.Link, s *obj.LSym, newprog obj.ProgAlloc) {
}
switch {
case p.As < AUnreachable || p.As > AF64ReinterpretI64:
case p.As < AUnreachable || p.As >= ALast:
panic(fmt.Sprintf("unexpected assembler op: %s", p.As))
case p.As < AEnd:
w.WriteByte(byte(p.As - AUnreachable + 0x00))