Commit c0740fed authored by Keith Randall's avatar Keith Randall

cmd/compile: more ssa config flags

To turn ssa compilation on or off altogether, use
-ssa=1 or -ssa=0.  Default is on.

To turn on or off consistency checks, do
-d=ssa/check/on or -d=ssa/check/off.  Default is on for now.

Change-Id: I277e0311f538981c8b9c62e7b7382a0c8755ce4c
Reviewed-on: https://go-review.googlesource.com/20217Reviewed-by: default avatarDavid Chase <drchase@google.com>
parent 7f13fbf7
......@@ -231,6 +231,7 @@ func Main() {
obj.Flagstr("cpuprofile", "write cpu profile to `file`", &cpuprofile)
obj.Flagstr("memprofile", "write memory profile to `file`", &memprofile)
obj.Flagint64("memprofilerate", "set runtime.MemProfileRate to `rate`", &memprofilerate)
flag.BoolVar(&ssaEnabled, "ssa", true, "use SSA backend to generate code")
obj.Flagparse(usage)
if flag_dynlink {
......
......@@ -17,6 +17,8 @@ import (
"cmd/internal/obj/x86"
)
var ssaEnabled = true
// Smallest possible faulting page at address zero.
const minZeroPage = 4096
......@@ -36,6 +38,9 @@ func shouldssa(fn *Node) bool {
if Thearch.Thestring != "amd64" {
return false
}
if !ssaEnabled {
return false
}
// Environment variable control of SSA CG
// 1. IF GOSSAFUNC == current function name THEN
......
......@@ -40,7 +40,9 @@ func Compile(f *Func) {
// Run all the passes
printFunc(f)
f.Config.HTML.WriteFunc("start", f)
checkFunc(f)
if checkEnabled {
checkFunc(f)
}
const logMemStats = false
for _, p := range passes {
if !f.Config.optimize && !p.required {
......@@ -93,7 +95,9 @@ func Compile(f *Func) {
f.logStat("TIME(ns):BYTES:ALLOCS", time, nBytes, nAllocs)
}
}
checkFunc(f)
if checkEnabled {
checkFunc(f)
}
}
// Squash error printing defer
......@@ -112,6 +116,9 @@ type pass struct {
test int // pass-specific ad-hoc option, perhaps useful in development
}
// Run consistency checker between each phase
var checkEnabled = true
// PhaseOption sets the specified flag in the specified ssa phase,
// returning empty string if this was successful or a string explaining
// the error if it was not. A version of the phase name with "_"
......@@ -120,6 +127,14 @@ type pass struct {
// GO_GCFLAGS=-d=ssa/generic_cse/time,ssa/generic_cse/stats,ssa/generic_cse/debug=3 ./make.bash ...
//
func PhaseOption(phase, flag string, val int) string {
if phase == "check" && flag == "on" {
checkEnabled = val != 0
return ""
}
if phase == "check" && flag == "off" {
checkEnabled = val == 0
return ""
}
underphase := strings.Replace(phase, "_", " ", -1)
for i, p := range passes {
if p.name == phase || p.name == underphase {
......
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