test/codegen: port direct comparisons with memory tests

And remove them from asm_test.

Change-Id: I1ca29b40546d6de06f20bfd550ed8ff87f495454
Reviewed-on: https://go-review.googlesource.com/102115
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

@@ -394,55 +394,6 @@ var linuxAMD64Tests = []*asmTest{
 		`,
 		pos: []string{"TEXT\t.*, [$]0-8"},
 	},
-	// int <-> fp moves
-	{
-		fn: `
-		func $(x uint32) bool {
-			return x > 4
-		}
-		`,
-		pos: []string{"\tSETHI\t.*\\(SP\\)"},
-	},
-	{
-		fn: `
-		func $(p int, q *int) bool {
-			return p < *q
-		}
-		`,
-		pos: []string{"CMPQ\t\\(.*\\), [A-Z]"},
-	},
-	{
-		fn: `
-		func $(p *int, q int) bool {
-			return *p < q
-		}
-		`,
-		pos: []string{"CMPQ\t\\(.*\\), [A-Z]"},
-	},
-	{
-		fn: `
-		func $(p *int) bool {
-			return *p < 7
-		}
-		`,
-		pos: []string{"CMPQ\t\\(.*\\), [$]7"},
-	},
-	{
-		fn: `
-		func $(p *int) bool {
-			return 7 < *p
-		}
-		`,
-		pos: []string{"CMPQ\t\\(.*\\), [$]7"},
-	},
-	{
-		fn: `
-		func $(p **int) {
-			*p = nil
-		}
-		`,
-		pos: []string{"CMPL\truntime.writeBarrier\\(SB\\), [$]0"},
-	},
 }
 
 var linux386Tests = []*asmTest{

test/codegen/comparisons.go

@@ -67,3 +67,42 @@ func CompareArray6(a, b unsafe.Pointer) bool {
 	// amd64:`CMPL\t\(.*\), [A-Z]`
 	return *((*[4]byte)(a)) != *((*[4]byte)(b))
 }
+
+// -------------- //
+//    Ordering    //
+// -------------- //
+
+// Test that LEAQ/ADDQconst are folded into SETx ops
+
+func CmpFold(x uint32) bool {
+	// amd64:`SETHI\t.*\(SP\)`
+	return x > 4
+}
+
+// Test that direct comparisons with memory are generated when
+// possible
+
+func CmpMem1(p int, q *int) bool {
+	// amd64:`CMPQ\t\(.*\), [A-Z]`
+	return p < *q
+}
+
+func CmpMem2(p *int, q int) bool {
+	// amd64:`CMPQ\t\(.*\), [A-Z]`
+	return *p < q
+}
+
+func CmpMem3(p *int) bool {
+	// amd64:`CMPQ\t\(.*\), [$]7`
+	return *p < 7
+}
+
+func CmpMem4(p *int) bool {
+	// amd64:`CMPQ\t\(.*\), [$]7`
+	return 7 < *p
+}
+
+func CmpMem5(p **int) {
+	// amd64:`CMPL\truntime.writeBarrier\(SB\), [$]0`
+	*p = nil
+}