[dev.ssa] cmd/compile: default compile+test with SSA

Some tests disabled, some bifurcated into _ssa and not,
with appropriate logging added to compiler.

"tests/live.go" in particular needs attention.

SSA-specific testing removed, since it's all SSA now.

Added "-run_skips" option to tests/run.go to simplify
checking whether a test still fails (or how it fails)
on a skipped platform.

The compiler now compiles with SSA by default.
If you don't want SSA, specify GOSSAHASH=n (or N) as
an environment variable.  Function names ending in "_ssa"
are always SSA-compiled.

GOSSAFUNC=fname retains its "SSA for fname, log to ssa.html"
GOSSAPKG=pkg only has an effect when GOSSAHASH=n
GOSSAHASH=10101 etc retains its name-hash-matching behavior
for purposes of debugging.

See #13068

Change-Id: I8217bfeb34173533eaeb391b5f6935483c7d6b43
Reviewed-on: https://go-review.googlesource.com/16299
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: David Chase <drchase@google.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/src/cmd/compile/internal/ssa/export_test.go b/src/cmd/compile/internal/ssa/export_test.go
index d0ba7b1c09..c37db75803 100644
--- a/src/cmd/compile/internal/ssa/export_test.go
+++ b/src/cmd/compile/internal/ssa/export_test.go
@@ -32,9 +32,11 @@ func (DummyFrontend) Auto(t Type) GCNode {
 	return nil
 }
 
-func (d DummyFrontend) Logf(msg string, args ...interface{})           { d.t.Logf(msg, args...) }
-func (d DummyFrontend) Fatalf(msg string, args ...interface{})         { d.t.Fatalf(msg, args...) }
-func (d DummyFrontend) Unimplementedf(msg string, args ...interface{}) { d.t.Fatalf(msg, args...) }
+func (d DummyFrontend) Logf(msg string, args ...interface{})            { d.t.Logf(msg, args...) }
+func (d DummyFrontend) Fatalf(msg string, args ...interface{})          { d.t.Fatalf(msg, args...) }
+func (d DummyFrontend) Unimplementedf(msg string, args ...interface{})  { d.t.Fatalf(msg, args...) }
+func (d DummyFrontend) Warnl(line int, msg string, args ...interface{}) { d.t.Logf(msg, args...) }
+func (d DummyFrontend) Debug_checknil() bool                            { return false }
 
 func (d DummyFrontend) TypeBool() Type    { return TypeBool }
 func (d DummyFrontend) TypeInt8() Type    { return TypeInt8 }