test/codegen: port all small memmove tests to codegen

This change ports all the remaining tests checking that small memmoves
are replaced with MOVs to the new codegen test harness, and deletes
them from the asm_test file.

Change-Id: I01c94b441e27a5d61518035af62d62779dafeb56
Reviewed-on: https://go-review.googlesource.com/100476
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

src/cmd/compile/internal/gc/asm_test.go

@@ -630,36 +630,6 @@ var linuxAMD64Tests = []*asmTest{
 		`,
 		pos: []string{"\tANDQ\t\\$4095,"},
 	},
-	{
-		// Test that small memmove was replaced with direct movs
-		fn: `
-                func $() {
-                       x := [...]byte{1, 2, 3, 4, 5, 6, 7}
-                       copy(x[1:], x[:])
-                }
-		`,
-		neg: []string{"memmove"},
-	},
-	{
-		// Same as above but with different size
-		fn: `
-                func $() {
-                       x := [...]byte{1, 2, 3, 4}
-                       copy(x[1:], x[:])
-                }
-		`,
-		neg: []string{"memmove"},
-	},
-	{
-		// Same as above but with different size
-		fn: `
-                func $() {
-                       x := [...]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}
-                       copy(x[1:], x[:])
-                }
-		`,
-		neg: []string{"memmove"},
-	},
 	{
 		fn: `
 		func $(p int, q *int) bool {
@@ -765,26 +735,6 @@ var linux386Tests = []*asmTest{
 		`,
 		pos: []string{"\tANDL\t\\$4095,"},
 	},
-	{
-		// Test that small memmove was replaced with direct movs
-		fn: `
-                func $() {
-                       x := [...]byte{1, 2, 3, 4, 5, 6, 7}
-                       copy(x[1:], x[:])
-                }
-		`,
-		neg: []string{"memmove"},
-	},
-	{
-		// Same as above but with different size
-		fn: `
-                func $() {
-                       x := [...]byte{1, 2, 3, 4}
-                       copy(x[1:], x[:])
-                }
-		`,
-		neg: []string{"memmove"},
-	},
 }
 
 var linuxS390XTests = []*asmTest{

test/codegen/movesmall.go

@@ -6,7 +6,28 @@
 
 package codegen
 
-func movesmall() {
+// These tests check that memmoves calls on small data are replaced
+// with MOVs
+
+func movesmall4() {
+	x := [...]byte{1, 2, 3, 4}
+	// 386:-".*memmove"
+	// amd64:-".*memmove"
+	// arm:-".*memmove"
+	// arm64:-".*memmove"
+	copy(x[1:], x[:])
+}
+
+func movesmall7() {
 	x := [...]byte{1, 2, 3, 4, 5, 6, 7}
-	copy(x[1:], x[:]) // arm64:-".*memmove"
+	// 386:-".*memmove"
+	// amd64:-".*memmove"
+	// arm64:-".*memmove"
+	copy(x[1:], x[:])
+}
+
+func movesmall16() {
+	x := [...]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}
+	// amd64:-".*memmove"
+	copy(x[1:], x[:])
 }