Add Explicit TSX support (#16)

* Add Explicit TSX support

See #15

Also updates test set and updates private package.

* Remove Go 1.3 and 1.4 checks.

Author: klauspost

.travis.yml

@@ -1,8 +1,24 @@
 language: go
 
+sudo: false
+
+os:
+  - linux
+  - osx  
 go:
-  - 1.3
-  - 1.4
-  - 1.5
-  - 1.6
-  - tip
+  - 1.5.x
+  - 1.6.x
+  - 1.7.x
+  - 1.8.x
+  - master
+
+script: 
+ - go vet ./...
+ - go test -v ./...
+ - go test -race ./...
+ - diff <(gofmt -d .) <("") 
+
+matrix:
+  allow_failures:
+    - go: 'master'
+  fast_finish: true 

cpuid.go

@@ -192,7 +192,7 @@ func Detect() {
 	CPU.CacheLine = cacheLine()
 	CPU.Family, CPU.Model = familyModel()
 	CPU.Features = support()
-	CPU.SGX = sgx(CPU.Features&SGX != 0)
+	CPU.SGX = hasSGX(CPU.Features&SGX != 0)
 	CPU.ThreadsPerCore = threadsPerCore()
 	CPU.LogicalCores = logicalCores()
 	CPU.PhysicalCores = physicalCores()
@@ -437,14 +437,22 @@ func (c CPUInfo) ERMS() bool {
 	return c.Features&ERMS != 0
 }
 
+// RDTSCP Instruction is available.
 func (c CPUInfo) RDTSCP() bool {
 	return c.Features&RDTSCP != 0
 }
 
+// CX16 indicates if CMPXCHG16B instruction is available.
 func (c CPUInfo) CX16() bool {
 	return c.Features&CX16 != 0
 }
 
+// TSX is split into HLE (Hardware Lock Elision) and RTM (Restricted Transactional Memory) detection.
+// So TSX simply checks that.
+func (c CPUInfo) TSX() bool {
+	return c.Features&(MPX|RTM) == MPX|RTM
+}
+
 // Atom indicates an Atom processor
 func (c CPUInfo) Atom() bool {
 	return c.Features&ATOM != 0
@@ -757,7 +765,7 @@ type SGXSupport struct {
 	MaxEnclaveSize64    int64
 }
 
-func sgx(available bool) (rval SGXSupport) {
+func hasSGX(available bool) (rval SGXSupport) {
 	rval.Available = available
 
 	if !available {

cpuid_test.go

@@ -634,6 +634,16 @@ func TestVM(t *testing.T) {
 	t.Log("Vendor ID:", CPU.VM())
 }
 
+// NSC returns true if vendor is recognized as National Semiconductor
+func TestCPUInfo_TSX(t *testing.T) {
+	got := CPU.TSX()
+	expected := CPU.HLE() && CPU.RTM()
+	if got != expected {
+		t.Fatalf("TestNSC: expected %v, got %v", expected, got)
+	}
+	t.Log("TestNSC:", got)
+}
+
 // Test RTCounter function
 func TestRtCounter(t *testing.T) {
 	a := CPU.RTCounter()
@@ -676,7 +686,7 @@ func TestMaxFunction(t *testing.T) {
 
 // This example will calculate the chip/core number on Linux
 // Linux encodes numa id (<<12) and core id (8bit) into TSC_AUX.
-func ExampleCPUInfo_Ia32TscAux(t *testing.T) {
+func ExampleCPUInfo_Ia32TscAux() {
 	ecx := CPU.Ia32TscAux()
 	if ecx == 0 {
 		fmt.Println("Unknown CPU ID")

generate.go

@@ -1,3 +1,4 @@
 package cpuid
 
 //go:generate go run private-gen.go
+//go:generate gofmt -w ./private