test/codegen: port tbz/tbnz arm64 tests

And delete them from asm_test.

Change-Id: I34fcf85ae8ce09cd146fe4ce6a0ae7616bd97e2d
Reviewed-on: https://go-review.googlesource.com/102296
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Giovanni Bajo <rasky@develer.com>

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

@@ -481,46 +481,6 @@ var linuxARM64Tests = []*asmTest{
 		pos: []string{"LSL\t\\$17"},
 		neg: []string{"CMP"},
 	},
-	{
-		fn: `
-		func $(a int32, ptr *int) {
-			if a >= 0 {
-				*ptr = 0
-			}
-		}
-		`,
-		pos: []string{"TBNZ"},
-	},
-	{
-		fn: `
-		func $(a int64, ptr *int) {
-			if a >= 0 {
-				*ptr = 0
-			}
-		}
-		`,
-		pos: []string{"TBNZ"},
-	},
-	{
-		fn: `
-		func $(a int32, ptr *int) {
-			if a < 0 {
-				*ptr = 0
-			}
-		}
-		`,
-		pos: []string{"TBZ"},
-	},
-	{
-		fn: `
-		func $(a int64, ptr *int) {
-			if a < 0 {
-				*ptr = 0
-			}
-		}
-		`,
-		pos: []string{"TBZ"},
-	},
 	// Load-combining tests.
 	{
 		fn: `

test/codegen/comparisons.go

@@ -106,3 +106,29 @@ func CmpMem5(p **int) {
 	// amd64:`CMPL\truntime.writeBarrier\(SB\), [$]0`
 	*p = nil
 }
+
+// Check tbz/tbnz are generated when comparing against zero on arm64
+
+func CmpZero1(a int32, ptr *int) {
+	if a < 0 { // arm64:"TBZ"
+		*ptr = 0
+	}
+}
+
+func CmpZero2(a int64, ptr *int) {
+	if a < 0 { // arm64:"TBZ"
+		*ptr = 0
+	}
+}
+
+func CmpZero3(a int32, ptr *int) {
+	if a >= 0 { // arm64:"TBNZ"
+		*ptr = 0
+	}
+}
+
+func CmpZero4(a int64, ptr *int) {
+	if a >= 0 { // arm64:"TBNZ"
+		*ptr = 0
+	}
+}