tailcall VM only for x64

Author: henderkes

Zend/tests/vm_kind_tailcall_clang_windows.phpt

@@ -1,8 +1,9 @@
 --TEST--
-Tailcall VM is selected when compiled with Clang >= 19 on Windows
+Tailcall VM is selected when compiled with Clang >= 19 on Windows x64
 --SKIPIF--
 <?php
 if (PHP_OS_FAMILY !== 'Windows') die('skip Windows only');
+if (php_uname('m') !== 'AMD64') die('skip x64 only');
 
 ob_start();
 phpinfo(INFO_GENERAL);

Zend/zend_vm_gen.php

@@ -2497,7 +2497,7 @@ function gen_vm_opcodes_header(
         $str .= "# define ZEND_VM_KIND\t\tZEND_VM_KIND_HYBRID\n";
     }
     if ($GLOBALS["vm_kind_name"][ZEND_VM_GEN_KIND] === "ZEND_VM_KIND_HYBRID" || $GLOBALS["vm_kind_name"][ZEND_VM_GEN_KIND] === "ZEND_VM_KIND_CALL") {
-        $str .= "#elif defined(HAVE_MUSTTAIL) && defined(HAVE_PRESERVE_NONE) && (defined(__x86_64__) || defined(_M_X64) || defined(__aarch64__) || defined(_M_ARM64))\n";
+        $str .= "#elif defined(HAVE_MUSTTAIL) && defined(HAVE_PRESERVE_NONE) && (defined(__x86_64__) || defined(_M_X64) || defined(__aarch64__))\n";
         $str .= "# define ZEND_VM_KIND\t\tZEND_VM_KIND_TAILCALL\n";
         $str .= "#else\n";
         $str .= "# define ZEND_VM_KIND\t\tZEND_VM_KIND_CALL\n";

Zend/zend_vm_opcodes.h

@@ -3375,7 +3375,7 @@ function toolset_setup_common_cflags()
 		var vc_ver = probe_binary(PATH_PROG('cl', null));
 		ADD_FLAG("CFLAGS"," -fms-compatibility -fms-compatibility-version=" + vc_ver + " -fms-extensions");
 
-        if (CLANGVERS >= 1900 && (TARGET_ARCH === 'x64' || TARGET_ARCH === 'arm64')) {
+        if (CLANGVERS >= 1900 && TARGET_ARCH === 'x64') {
             AC_DEFINE('HAVE_PRESERVE_NONE', 1, 'Whether the compiler supports __attribute__((preserve_none))');
         }
 	}