From 3c4c1e756bf3c042f0788e45b9d997054ce3eae2 Mon Sep 17 00:00:00 2001
From: "Kenneth Benzie (Benie)" <k.benzie@codeplay.com>
Date: Fri, 24 Nov 2023 14:50:43 +0000
Subject: [PATCH] Merge pull request #1039 from
 omarahmed1111/eliminate-usage-of-regex-in-opencl

[UR][OPENCL] Eliminate usage of regex in opencl
---
 source/adapters/opencl/common.hpp | 24 ++++++++++++++++++------
 source/adapters/opencl/kernel.cpp |  3 +++
 2 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/source/adapters/opencl/common.hpp b/source/adapters/opencl/common.hpp
index 767dc02fda..0cb19694a6 100644
--- a/source/adapters/opencl/common.hpp
+++ b/source/adapters/opencl/common.hpp
@@ -12,7 +12,6 @@
 #include <climits>
 #include <map>
 #include <mutex>
-#include <regex>
 #include <ur/ur.hpp>
 
 /**
@@ -72,12 +71,25 @@ class OpenCLVersion {
      * 'OpenCL<space><ocl_major_version.ocl_minor_version><space><vendor-specific
      * information>' for devices.
      */
-    std::regex Rx("OpenCL ([0-9]+)\\.([0-9]+)");
-    std::smatch Match;
+    std::string_view Prefix = "OpenCL ";
+    size_t VersionBegin = Version.find_first_of(" ");
+    size_t VersionEnd = Version.find_first_of(" ", VersionBegin + 1);
+    size_t VersionSeparator = Version.find_first_of(".", VersionBegin + 1);
 
-    if (std::regex_search(Version, Match, Rx) && (Match.size() == 3)) {
-      OCLMajor = strtoul(Match[1].str().c_str(), nullptr, 10);
-      OCLMinor = strtoul(Match[2].str().c_str(), nullptr, 10);
+    bool HaveOCLPrefix =
+        std::equal(Prefix.begin(), Prefix.end(), Version.begin());
+
+    if (HaveOCLPrefix && VersionBegin != std::string::npos &&
+        VersionEnd != std::string::npos &&
+        VersionSeparator != std::string::npos) {
+
+      std::string VersionMajor{Version.begin() + VersionBegin + 1,
+                               Version.begin() + VersionSeparator};
+      std::string VersionMinor{Version.begin() + VersionSeparator + 1,
+                               Version.begin() + VersionEnd};
+
+      OCLMajor = strtoul(VersionMajor.c_str(), nullptr, 10);
+      OCLMinor = strtoul(VersionMinor.c_str(), nullptr, 10);
 
       if (!isValid()) {
         OCLMajor = OCLMinor = 0;
diff --git a/source/adapters/opencl/kernel.cpp b/source/adapters/opencl/kernel.cpp
index e7c8444a17..44157b826b 100644
--- a/source/adapters/opencl/kernel.cpp
+++ b/source/adapters/opencl/kernel.cpp
@@ -9,6 +9,9 @@
 //===----------------------------------------------------------------------===//
 #include "common.hpp"
 
+#include <algorithm>
+#include <memory>
+
 UR_APIEXPORT ur_result_t UR_APICALL
 urKernelCreate(ur_program_handle_t hProgram, const char *pKernelName,
                ur_kernel_handle_t *phKernel) {