From 2e6a8496ed1ae1802df25d8068c1d3749d3ae4d1 Mon Sep 17 00:00:00 2001
From: Andreas Beckmann <anbe@debian.org>
Date: Tue, 8 Apr 2025 07:32:27 +0200
Subject: [PATCH] add support for a GENERIC cpu type that uses llvm defaults

Forwarded: not-needed


Gbp-Pq: Name generic-cpu.patch
---
 cmake/LLVM.cmake               | 12 ++++++++++--
 lib/CL/devices/common.c        |  3 +++
 lib/kernel/host/CMakeLists.txt |  5 +++++
 3 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/cmake/LLVM.cmake b/cmake/LLVM.cmake
index 5ad997b..a9d94bc 100644
--- a/cmake/LLVM.cmake
+++ b/cmake/LLVM.cmake
@@ -709,17 +709,25 @@ endif()
 # Some architectures have -march and -mcpu reversed
 if(NOT DEFINED CLANG_MARCH_FLAG)
   message(STATUS "Checking clang -march vs. -mcpu flag")
-  custom_try_compile_clang_silent("" "return 0;" RES ${CLANG_TARGET_OPTION}${LLC_TRIPLE} -march=${SELECTED_HOST_CPU})
+ if(LLC_HOST_CPU STREQUAL "GENERIC" AND NOT KERNELLIB_HOST_CPU_VARIANTS STREQUAL "distro")
+  set(CLANG_MARCH_FLAG "-None=")
+ else()
+  set(LLC_HOST_CPU_TEST "${SELECTED_HOST_CPU}")
+  if(LLC_HOST_CPU STREQUAL "GENERIC")
+    set(LLC_HOST_CPU_TEST "${LLC_HOST_CPU_AUTO}")
+  endif()
+  custom_try_compile_clang_silent("" "return 0;" RES ${CLANG_TARGET_OPTION}${LLC_TRIPLE} -march=${LLC_HOST_CPU_TEST})
   if(NOT RES)
     set(CLANG_MARCH_FLAG "-march=")
   else()
-    custom_try_compile_clang_silent("" "return 0;" RES ${CLANG_TARGET_OPTION}${LLC_TRIPLE} -mcpu=${SELECTED_HOST_CPU})
+    custom_try_compile_clang_silent("" "return 0;" RES ${CLANG_TARGET_OPTION}${LLC_TRIPLE} -mcpu=${LLC_HOST_CPU_TEST})
     if(NOT RES)
       set(CLANG_MARCH_FLAG "-mcpu=")
     else()
       message(FATAL_ERROR "Could not determine whether to use -march or -mcpu with clang")
     endif()
   endif()
+ endif()
   message(STATUS "  Using ${CLANG_MARCH_FLAG}")
 
   set(CLANG_MARCH_FLAG ${CLANG_MARCH_FLAG} CACHE INTERNAL "Clang option used to specify the target cpu")
diff --git a/lib/CL/devices/common.c b/lib/CL/devices/common.c
index 892e3c3..c2f29ec 100644
--- a/lib/CL/devices/common.c
+++ b/lib/CL/devices/common.c
@@ -1737,6 +1737,9 @@ pocl_init_default_device_infos (cl_device_id dev,
   dev->kernellib_subdir = "host";
   dev->llvm_abi = pocl_get_llvm_cpu_abi ();
 
+  if(dev->llvm_cpu && (!strcmp(dev->llvm_cpu, "GENERIC")))
+    dev->llvm_cpu = NULL;
+
 #else /* No compiler, no CPU info */
   dev->kernellib_name = NULL;
   dev->kernellib_fallback_name = NULL;
diff --git a/lib/kernel/host/CMakeLists.txt b/lib/kernel/host/CMakeLists.txt
index 871fa77..8acf4d9 100644
--- a/lib/kernel/host/CMakeLists.txt
+++ b/lib/kernel/host/CMakeLists.txt
@@ -588,6 +588,11 @@ else()
   set(LLC_CPUFLAGS "-mcpu=${VARIANT}")
 endif()
 
+if("${VARIANT}" STREQUAL "GENERIC")
+  set(CLANG_CPUFLAGS "")
+  set(LLC_CPUFLAGS "")
+endif()
+
 separate_arguments(CLANG_CPUFLAGS)
 separate_arguments(LLC_CPUFLAGS)
 set(CLANG_FLAGS ${HOST_CLANG_FLAGS} ${CLANG_CPUFLAGS}
-- 
2.30.2