From 7fea91ec5bc6a821e5e2b0126090bb027dcf4280 Mon Sep 17 00:00:00 2001
From: Andreas Beckmann <anbe@debian.org>
Date: Tue, 16 Feb 2021 10:00:57 +0000
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/CL/pocl_llvm_build.cc      |  2 +-
 lib/kernel/host/CMakeLists.txt |  5 +++++
 4 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/cmake/LLVM.cmake b/cmake/LLVM.cmake
index 86c8194..e094d02 100644
--- a/cmake/LLVM.cmake
+++ b/cmake/LLVM.cmake
@@ -720,17 +720,25 @@ endif()
 
 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=${LLC_HOST_CPU})
+ if(LLC_HOST_CPU STREQUAL "GENERIC" AND NOT KERNELLIB_HOST_CPU_VARIANTS STREQUAL "distro")
+  set(CLANG_MARCH_FLAG "-None=")
+ else()
+  set(LLC_HOST_CPU_TEST "${LLC_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=${LLC_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 a62eca6..715098c 100644
--- a/lib/CL/devices/common.c
+++ b/lib/CL/devices/common.c
@@ -1572,6 +1572,9 @@ pocl_init_default_device_infos (cl_device_id dev)
   dev->llvm_cpu = get_llvm_cpu_name ();
 #endif
 
+  if(dev->llvm_cpu && (!strcmp(dev->llvm_cpu, "GENERIC")))
+    dev->llvm_cpu = NULL;
+
   dev->spirv_version = "SPIR-V_1.2";
 #else /* No compiler, no CPU info */
   dev->llvm_cpu = NULL;
diff --git a/lib/CL/pocl_llvm_build.cc b/lib/CL/pocl_llvm_build.cc
index 5c60743..dbd6568 100644
--- a/lib/CL/pocl_llvm_build.cc
+++ b/lib/CL/pocl_llvm_build.cc
@@ -879,7 +879,7 @@ static llvm::Module* getKernelLibrary(cl_device_id device)
     kernellib_fallback = kernellib;
     kernellib_fallback += OCL_KERNEL_TARGET_CPU;
     kernellib_fallback += ".bc";
-    kernellib += device->llvm_cpu;
+    kernellib += device->llvm_cpu ? device->llvm_cpu : "GENERIC";
 #endif
   }
   kernellib += ".bc";
diff --git a/lib/kernel/host/CMakeLists.txt b/lib/kernel/host/CMakeLists.txt
index 6d50311..12c1935 100644
--- a/lib/kernel/host/CMakeLists.txt
+++ b/lib/kernel/host/CMakeLists.txt
@@ -472,6 +472,11 @@ 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