diff --git a/src/cmd/compile/internal/gc/gsubr.go b/src/cmd/compile/internal/gc/gsubr.go
index fd536ee06da..d1c012baeda 100644
--- a/src/cmd/compile/internal/gc/gsubr.go
+++ b/src/cmd/compile/internal/gc/gsubr.go
@@ -30,10 +30,7 @@
 
 package gc
 
-import (
-	"cmd/internal/obj"
-	"fmt"
-)
+import "cmd/internal/obj"
 
 func Prog(as obj.As) *obj.Prog {
 	var p *obj.Prog
@@ -314,9 +311,5 @@ func Gins(as obj.As, f, t *Node) *obj.Prog {
 	p := Prog(as)
 	Naddr(&p.From, f)
 	Naddr(&p.To, t)
-
-	if Debug['g'] != 0 {
-		fmt.Printf("%v\n", p)
-	}
 	return p
 }
diff --git a/src/cmd/compile/internal/gc/main.go b/src/cmd/compile/internal/gc/main.go
index c5ae7d3fba3..edb37c2c742 100644
--- a/src/cmd/compile/internal/gc/main.go
+++ b/src/cmd/compile/internal/gc/main.go
@@ -155,10 +155,7 @@ func Main() {
 	obj.Flagcount("E", "debug symbol export", &Debug['E'])
 	obj.Flagfn1("I", "add `directory` to import search path", addidir)
 	obj.Flagcount("K", "debug missing line numbers", &Debug['K'])
-	obj.Flagcount("M", "debug move generation", &Debug['M'])
 	obj.Flagcount("N", "disable optimizations", &Debug['N'])
-	obj.Flagcount("P", "debug peephole optimizer", &Debug['P'])
-	obj.Flagcount("R", "debug register optimizer", &Debug['R'])
 	obj.Flagcount("S", "print assembly listing", &Debug['S'])
 	obj.Flagfn0("V", "print compiler version", doversion)
 	obj.Flagcount("W", "debug parse tree after type checking", &Debug['W'])
@@ -168,7 +165,6 @@ func Main() {
 	flag.StringVar(&debugstr, "d", "", "print debug information about items in `list`")
 	obj.Flagcount("e", "no limit on number of errors reported", &Debug['e'])
 	obj.Flagcount("f", "debug stack frames", &Debug['f'])
-	obj.Flagcount("g", "debug code generation", &Debug['g'])
 	obj.Flagcount("h", "halt on error", &Debug['h'])
 	obj.Flagcount("i", "debug line number stack", &Debug['i'])
 	obj.Flagfn1("importmap", "add `definition` of the form source=actual to import map", addImportMap)
@@ -191,7 +187,6 @@ func Main() {
 	obj.Flagcount("v", "increase debug verbosity", &Debug['v'])
 	obj.Flagcount("w", "debug type checking", &Debug['w'])
 	flag.BoolVar(&use_writebarrier, "wb", true, "enable write barrier")
-	obj.Flagcount("x", "debug lexer", &Debug['x'])
 	var flag_shared bool
 	var flag_dynlink bool
 	if supportsDynlink(Thearch.LinkArch.Arch) {
@@ -309,10 +304,6 @@ func Main() {
 	timings.Start("fe", "parse")
 	lexlineno0 := lexlineno
 	for _, infile = range flag.Args() {
-		if trace && Debug['x'] != 0 {
-			fmt.Printf("--- %s ---\n", infile)
-		}
-
 		linehistpush(infile)
 		block = 1
 		iota_ = -1000000
diff --git a/src/cmd/compile/internal/gc/parser.go b/src/cmd/compile/internal/gc/parser.go
index 641dcb65d03..8f630183ef5 100644
--- a/src/cmd/compile/internal/gc/parser.go
+++ b/src/cmd/compile/internal/gc/parser.go
@@ -12,8 +12,6 @@ package gc
 // Semicolons are inserted by the lexer. The parser uses one-token look-ahead
 // to handle optional commas and semicolons before a closing ) or } .
 
-const trace = false // if set, parse tracing can be enabled with -x
-
 func mkname(sym *Sym) *Node {
 	n := oldname(sym)
 	if n.Name != nil && n.Name.Pack != nil {