[dev.ssa] cmd/compile: enhance SSA filtering, add OpConvert

Modified GOSSA{HASH.PKG} environment variable filters to
make it easier to make/run with all SSA for testing.
Disable attempts at SSA for architectures that are not
amd64 (avoid spurious errors/unimplementeds.)

Removed easy out for unimplemented features.

Add convert op for proper liveness in presence of uintptr
to/from unsafe.Pointer conversions.

Tweaked stack sizes to get a pass on windows;
1024 instead 768, was observed to pass at least once.

Change-Id: Ida3800afcda67d529e3b1cf48ca4a3f0fa48b2c5
Reviewed-on: https://go-review.googlesource.com/16201
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: David Chase <drchase@google.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/test/nosplit.go b/test/nosplit.go
index e5c2a9f30e..70e8fced86 100644
--- a/test/nosplit.go
+++ b/test/nosplit.go
@@ -9,6 +9,7 @@ package main
 
 import (
 	"bytes"
+	"cmd/internal/obj"
 	"fmt"
 	"io/ioutil"
 	"log"
@@ -285,12 +286,13 @@ TestCases:
 				// Instead of rewriting the test cases above, adjust
 				// the first stack frame to use up the extra bytes.
 				if i == 0 {
-					size += 512 - 128
+					size += (obj.StackGuard - 128) - 128
 					// Noopt builds have a larger stackguard.
-					// See ../cmd/dist/buildruntime.go:stackGuardMultiplier
+					// See ../src/cmd/dist/buildruntime.go:stackGuardMultiplier
+					// This increase is included in obj.StackGuard
 					for _, s := range strings.Split(os.Getenv("GO_GCFLAGS"), " ") {
 						if s == "-N" {
-							size += 640
+							size += obj.StackGuard
 						}
 					}
 				}