llvm cpu features

Author: j7b

compiler/compiler.go

@@ -30,6 +30,7 @@ func init() {
 type Config struct {
 	Triple        string   // LLVM target triple, e.g. x86_64-unknown-linux-gnu (empty string means default)
 	CPU           string   // LLVM CPU name, e.g. atmega328p (empty string means default)
+	Features      []string // LLVM CPU features
 	GOOS          string   //
 	GOARCH        string   //
 	GC            string   // garbage collection strategy
@@ -101,7 +102,11 @@ func NewCompiler(pkgName string, config Config) (*Compiler, error) {
 	if err != nil {
 		return nil, err
 	}
-	c.machine = target.CreateTargetMachine(config.Triple, config.CPU, "", llvm.CodeGenLevelDefault, llvm.RelocStatic, llvm.CodeModelDefault)
+	features := ""
+	if len(config.Features) > 0 {
+		features = strings.Join(config.Features, `,`)
+	}
+	c.machine = target.CreateTargetMachine(config.Triple, config.CPU, features, llvm.CodeGenLevelDefault, llvm.RelocStatic, llvm.CodeModelDefault)
 	c.targetData = c.machine.CreateTargetData()
 
 	c.ctx = llvm.NewContext()

main.go

@@ -94,6 +94,7 @@ func Compile(pkgName, outpath string, spec *TargetSpec, config *BuildConfig, act
 	compilerConfig := compiler.Config{
 		Triple:        spec.Triple,
 		CPU:           spec.CPU,
+		Features:      spec.Features,
 		GOOS:          spec.GOOS,
 		GOARCH:        spec.GOARCH,
 		GC:            config.gc,

target.go

@@ -24,6 +24,7 @@ type TargetSpec struct {
 	Inherits   []string `json:"inherits"`
 	Triple     string   `json:"llvm-target"`
 	CPU        string   `json:"cpu"`
+	Features   []string `json:"features"`
 	GOOS       string   `json:"goos"`
 	GOARCH     string   `json:"goarch"`
 	BuildTags  []string `json:"build-tags"`
@@ -52,6 +53,7 @@ func (spec *TargetSpec) copyProperties(spec2 *TargetSpec) {
 	if spec2.CPU != "" {
 		spec.CPU = spec2.CPU
 	}
+	spec.Features = append(spec.Features, spec2.Features...)
 	if spec2.GOOS != "" {
 		spec.GOOS = spec2.GOOS
 	}