Hail Mary

build.sbt

@@ -40,6 +40,8 @@ ThisBuild / githubWorkflowBuildPreamble ++= Seq(
 )
 
 ThisBuild / tlCiDocCheck := false
+// ThisBuild / githubWorkflowBuildPreamble ++= nativeBrewInstallWorkflowSteps.value
+// ThisBuild / nativeBrewInstallCond := Some("matrix.project == 'rootNative'")
 
 // publish to s01.oss.sonatype.org (set to true to publish to oss.sonatype.org instead)
 ThisBuild / tlSonatypeUseLegacyHost := false
@@ -48,6 +50,7 @@ ThisBuild / tlSonatypeUseLegacyHost := false
 ThisBuild / tlSitePublishBranch := Some("main")
 ThisBuild / scalaVersion := "3.3.1"
 ThisBuild / githubWorkflowJavaVersions := Seq(JavaSpec.temurin("17"))
+ThisBuild / tlJdkRelease := Some(17)
 
 lazy val root = tlCrossRootProject.aggregate(core, tests)
 
@@ -78,7 +81,12 @@ lazy val core = crossProject(
       new NodeJSEnv(NodeJSEnv.Config().withArgs(List("--enable-source-maps")))
     }
   )
-  .nativeSettings()
+  .nativeSettings(
+    // nativeBrewFormulas += "atlas", //??
+    libraryDependencies += "org.ekrich" %%% "sblas" % "0.5.0",
+
+    nativeConfig ~= { c => c.withLinkingOptions(c.linkingOptions :+ "-latlas") },
+  )
 
 lazy val docs = project
   .in(file("site"))

core/native/src/main/scala/vecxt/array.extensions.scala

@@ -19,6 +19,8 @@ package vecxt
 import vecxt.BoundsCheck
 import vecxt.Limits.Limit
 import vecxt.Retentions.Retention
+import org.ekrich.blas.unsafe.*
+import scala.scalanative.unsafe.*
 
 type NArray = Array[Double]
 
@@ -184,12 +186,9 @@ extension (vec: Array[Double])
     out
   end -
 
-  inline def -=(vec2: Array[Double]): Unit =
-    var i = 0
-    while i < vec.length do
-      vec(i) = vec(i) - vec2(i)
-      i = i + 1
-    end while
+  inline def -=(vec2: Array[Double])(using inline boundsCheck: BoundsCheck): Unit =
+    dimCheck(vec, vec2)
+    blas.cblas_daxpy(vec.length, -1.0, vec2.at(0) , 1, vec.at(0), 1)
   end -=
 
   inline def +(vec2: Array[Double]) =

project/plugins.sbt

@@ -1,5 +1,11 @@
 addSbtPlugin("org.typelevel" % "sbt-typelevel" % "0.6.1")
 addSbtPlugin("org.typelevel" % "sbt-typelevel-site" % "0.6.1")
 addSbtPlugin("org.typelevel" % "sbt-typelevel-scalafix" % "0.6.1")
+
 addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.14.0")
 addSbtPlugin("org.scalameta" % "sbt-mdoc" % "2.3.7")
+
+// scary ...
+addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.4.16")
+addSbtPlugin("org.portable-scala" % "sbt-scala-native-crossproject" % "1.3.1")
+addSbtPlugin("com.armanbilge" % "sbt-scala-native-config-brew-github-actions" % "0.1.3")