class Highway < Formula
  desc "Performance-portable, length-agnostic SIMD with runtime dispatch"
  homepage "https://github.com/google/highway"
  url "https://github.com/google/highway/archive/refs/tags/1.2.0.tar.gz"
  sha256 "7e0be78b8318e8bdbf6fa545d2ecb4c90f947df03f7aadc42c1967f019e63343"
  license "Apache-2.0"
  head "https://github.com/google/highway.git", branch: "master"

  depends_on "cmake" => :build

  # These used to be bundled with `jpeg-xl`.
  link_overwrite "include/hwy/*", "lib/pkgconfig/libhwy*"

  # Avoid compiling ARM SVE on Apple Silicon
  # Issue ref: https://github.com/google/highway/issues/2317
  patch :DATA

  def install
    ENV.runtime_cpu_detection
    system "cmake", "-S", ".", "-B", "builddir",
                    "-DBUILD_SHARED_LIBS=ON",
                    "-DHWY_ENABLE_TESTS=OFF",
                    "-DHWY_ENABLE_EXAMPLES=OFF",
                    "-DCMAKE_INSTALL_RPATH=#{rpath}",
                    *std_cmake_args
    system "cmake", "--build", "builddir"
    system "cmake", "--install", "builddir"
    (share/"hwy").install "hwy/examples"
  end

  test do
    system ENV.cxx, "-std=c++11", "-I#{share}", "-I#{include}",
                    share/"hwy/examples/benchmark.cc", "-L#{lib}", "-lhwy"
    system "./a.out"
  end
end

__END__
diff --git a/hwy/detect_targets.h b/hwy/detect_targets.h
index a8d4a13f..e0ffb33a 100644
--- a/hwy/detect_targets.h
+++ b/hwy/detect_targets.h
@@ -223,8 +223,12 @@
 #endif

 // SVE[2] require recent clang or gcc versions.
+//
+// SVE is not supported on Apple arm64 CPUs and also crashes the compiler:
+// https://github.com/llvm/llvm-project/issues/97198
 #if (HWY_COMPILER_CLANG && HWY_COMPILER_CLANG < 1100) || \
-    (HWY_COMPILER_GCC_ACTUAL && HWY_COMPILER_GCC_ACTUAL < 1000)
+    (HWY_COMPILER_GCC_ACTUAL && HWY_COMPILER_GCC_ACTUAL < 1000) || \
+    (HWY_OS_APPLE && HWY_ARCH_ARM_A64)
 #define HWY_BROKEN_SVE (HWY_SVE | HWY_SVE2 | HWY_SVE_256 | HWY_SVE2_128)
 #else
 #define HWY_BROKEN_SVE 0