test/codegen: port comparisons tests to codegen

And delete them from asm_test.

Change-Id: I64c512bfef3b3da6db5c5d29277675dade28b8ab
Reviewed-on: https://go-review.googlesource.com/101595
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

@@ -224,7 +224,7 @@ var allAsmTests = []*asmTests{
 	{
 		arch:    "amd64",
 		os:      "linux",
-		imports: []string{"unsafe", "runtime"},
+		imports: []string{"runtime"},
 		tests:   linuxAMD64Tests,
 	},
 	{
@@ -338,80 +338,6 @@ var linuxAMD64Tests = []*asmTest{
 		}`,
 		pos: []string{"\tADDQ\t[A-Z]"},
 	},
-	// Check that compare to constant string uses 2/4/8 byte compares
-	{
-		fn: `
-		func f65(a string) bool {
-		    return a == "xx"
-		}`,
-		pos: []string{"\tCMPW\t\\(.*\\), [$]"},
-	},
-	{
-		fn: `
-		func f66(a string) bool {
-		    return a == "xxxx"
-		}`,
-		pos: []string{"\tCMPL\t\\(.*\\), [$]"},
-	},
-	{
-		fn: `
-		func f67(a string) bool {
-		    return a == "xxxxxxxx"
-		}`,
-		pos: []string{"\tCMPQ\t[A-Z]"},
-	},
-	// Check that array compare uses 2/4/8 byte compares
-	{
-		fn: `
-		func f68(a,b [2]byte) bool {
-		    return a == b
-		}`,
-		pos: []string{"\tCMPW\t\"\"[.+_a-z0-9]+\\(SP\\), [A-Z]"},
-	},
-	{
-		fn: `
-		func f69(a,b [3]uint16) bool {
-		    return a == b
-		}`,
-		pos: []string{
-			"\tCMPL\t\"\"[.+_a-z0-9]+\\(SP\\), [A-Z]",
-			"\tCMPW\t\"\"[.+_a-z0-9]+\\(SP\\), [A-Z]",
-		},
-	},
-	{
-		fn: `
-		func $(a,b [3]int16) bool {
-		    return a == b
-		}`,
-		pos: []string{
-			"\tCMPL\t\"\"[.+_a-z0-9]+\\(SP\\), [A-Z]",
-			"\tCMPW\t\"\"[.+_a-z0-9]+\\(SP\\), [A-Z]",
-		},
-	},
-	{
-		fn: `
-		func $(a,b [12]int8) bool {
-		    return a == b
-		}`,
-		pos: []string{
-			"\tCMPQ\t\"\"[.+_a-z0-9]+\\(SP\\), [A-Z]",
-			"\tCMPL\t\"\"[.+_a-z0-9]+\\(SP\\), [A-Z]",
-		},
-	},
-	{
-		fn: `
-		func f70(a,b [15]byte) bool {
-		    return a == b
-		}`,
-		pos: []string{"\tCMPQ\t\"\"[.+_a-z0-9]+\\(SP\\), [A-Z]"},
-	},
-	{
-		fn: `
-		func f71(a,b unsafe.Pointer) bool { // This was a TODO in mapaccess1_faststr
-		    return *((*[4]byte)(a)) != *((*[4]byte)(b))
-		}`,
-		pos: []string{"\tCMPL\t\\(.*\\), [A-Z]"},
-	},
 	{
 		// make sure assembly output has matching offset and base register.
 		fn: `

test/codegen/comparisons.go

+// asmcheck
+
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package codegen
+
+import "unsafe"
+
+// This file contains code generation tests related to the comparison
+// operators.
+
+// -------------- //
+//    Equality    //
+// -------------- //
+
+// Check that compare to constant string use 2/4/8 byte compares
+
+func CompareString1(s string) bool {
+	// amd64:`CMPW\t\(.*\), [$]`
+	return s == "xx"
+}
+
+func CompareString2(s string) bool {
+	// amd64:`CMPL\t\(.*\), [$]`
+	return s == "xxxx"
+}
+
+func CompareString3(s string) bool {
+	// amd64:`CMPQ\t\(.*\), [A-Z]`
+	return s == "xxxxxxxx"
+}
+
+// Check that arrays compare use 2/4/8 byte compares
+
+func CompareArray1(a, b [2]byte) bool {
+	// amd64:`CMPW\t""[.+_a-z0-9]+\(SP\), [A-Z]`
+	return a == b
+}
+
+func CompareArray2(a, b [3]uint16) bool {
+	// amd64:`CMPL\t""[.+_a-z0-9]+\(SP\), [A-Z]`
+	// amd64:`CMPW\t""[.+_a-z0-9]+\(SP\), [A-Z]`
+	return a == b
+}
+
+func CompareArray3(a, b [3]int16) bool {
+	// amd64:`CMPL\t""[.+_a-z0-9]+\(SP\), [A-Z]`
+	// amd64:`CMPW\t""[.+_a-z0-9]+\(SP\), [A-Z]`
+	return a == b
+}
+
+func CompareArray4(a, b [12]int8) bool {
+	// amd64:`CMPQ\t""[.+_a-z0-9]+\(SP\), [A-Z]`
+	// amd64:`CMPL\t""[.+_a-z0-9]+\(SP\), [A-Z]`
+	return a == b
+}
+
+func CompareArray5(a, b [15]byte) bool {
+	// amd64:`CMPQ\t""[.+_a-z0-9]+\(SP\), [A-Z]`
+	return a == b
+}
+
+// This was a TODO in mapaccess1_faststr
+func CompareArray6(a, b unsafe.Pointer) bool {
+	// amd64:`CMPL\t\(.*\), [A-Z]`
+	return *((*[4]byte)(a)) != *((*[4]byte)(b))
+}