diff --git a/src/cmd/compile/internal/amd64/prog.go b/src/cmd/compile/internal/amd64/prog.go
index 5f4fe1c5ab..6c46f20a3b 100644
--- a/src/cmd/compile/internal/amd64/prog.go
+++ b/src/cmd/compile/internal/amd64/prog.go
@@ -165,6 +165,7 @@ var progtable = [x86.ALAST]obj.ProgInfo{
 	x86.AORW:      {Flags: gc.SizeW | gc.LeftRead | RightRdwr | gc.SetCarry},
 	x86.APOPQ:     {Flags: gc.SizeQ | gc.RightWrite},
 	x86.APUSHQ:    {Flags: gc.SizeQ | gc.LeftRead},
+	x86.APXOR:     {Flags: gc.SizeD | gc.LeftRead | RightRdwr},
 	x86.ARCLB:     {Flags: gc.SizeB | gc.LeftRead | RightRdwr | gc.ShiftCX | gc.SetCarry | gc.UseCarry},
 	x86.ARCLL:     {Flags: gc.SizeL | gc.LeftRead | RightRdwr | gc.ShiftCX | gc.SetCarry | gc.UseCarry},
 	x86.ARCLQ:     {Flags: gc.SizeQ | gc.LeftRead | RightRdwr | gc.ShiftCX | gc.SetCarry | gc.UseCarry},
diff --git a/src/cmd/compile/internal/x86/prog.go b/src/cmd/compile/internal/x86/prog.go
index ce432c17f3..8e1b7573b5 100644
--- a/src/cmd/compile/internal/x86/prog.go
+++ b/src/cmd/compile/internal/x86/prog.go
@@ -187,6 +187,7 @@ var progtable = [x86.ALAST]obj.ProgInfo{
 	x86.AORW:      {Flags: gc.SizeW | gc.LeftRead | RightRdwr | gc.SetCarry},
 	x86.APOPL:     {Flags: gc.SizeL | gc.RightWrite},
 	x86.APUSHL:    {Flags: gc.SizeL | gc.LeftRead},
+	x86.APXOR:     {Flags: gc.SizeD | gc.LeftRead | RightRdwr},
 	x86.ARCLB:     {Flags: gc.SizeB | gc.LeftRead | RightRdwr | gc.ShiftCX | gc.SetCarry | gc.UseCarry},
 	x86.ARCLL:     {Flags: gc.SizeL | gc.LeftRead | RightRdwr | gc.ShiftCX | gc.SetCarry | gc.UseCarry},
 	x86.ARCLW:     {Flags: gc.SizeW | gc.LeftRead | RightRdwr | gc.ShiftCX | gc.SetCarry | gc.UseCarry},