Revert "[libomptarget] Build a minimal deviceRTL for amdgcn"

This reverts commit 877ffa7 because it
breaks the build.

openmp/libomptarget/deviceRTLs/CMakeLists.txt

@@ -6,9 +6,8 @@
 #
 # ##===----------------------------------------------------------------------===##
 #
-# Build a device RTL for each available machine.
+# Build a device RTL for each available machine available.
 #
 ##===----------------------------------------------------------------------===##
 
-add_subdirectory(amdgcn)
 add_subdirectory(nvptx)

openmp/libomptarget/deviceRTLs/amdgcn/src/target_impl.h

@@ -72,6 +72,8 @@ EXTERN uint64_t __lanemask_lt();
 // thread's lane number in the warp
 EXTERN uint64_t __lanemask_gt();
 
+EXTERN void llvm_amdgcn_s_barrier();
+
 // CU id
 EXTERN unsigned __smid();
 
@@ -99,21 +101,25 @@ INLINE uint32_t __kmpc_impl_smid() {
   return __smid();
 }
 
-INLINE uint64_t __kmpc_impl_ffs(uint64_t x) { return __builtin_ffsl(x); }
+INLINE uint64_t __kmpc_impl_ffs(uint64_t x) { return __ffsll(x); }
 
-INLINE uint64_t __kmpc_impl_popc(uint64_t x) { return __builtin_popcountl(x); }
+INLINE uint64_t __kmpc_impl_popc(uint64_t x) { return __popcll(x); }
 
 INLINE __kmpc_impl_lanemask_t __kmpc_impl_activemask() {
   return __ballot64(1);
 }
 
-EXTERN int32_t __kmpc_impl_shfl_sync(__kmpc_impl_lanemask_t, int32_t Var,
-                                     int32_t SrcLane);
+INLINE int32_t __kmpc_impl_shfl_sync(__kmpc_impl_lanemask_t, int32_t Var,
+                                     int32_t SrcLane) {
+  return __shfl(Var, SrcLane, WARPSIZE);
+}
 
-EXTERN int32_t __kmpc_impl_shfl_down_sync(__kmpc_impl_lanemask_t, int32_t Var,
-                                          uint32_t Delta, int32_t Width);
+INLINE int32_t __kmpc_impl_shfl_down_sync(__kmpc_impl_lanemask_t, int32_t Var,
+                                          uint32_t Delta, int32_t Width) {
+  return __shfl_down(Var, Delta, Width);
+}
 
-INLINE void __kmpc_impl_syncthreads() { __builtin_amdgcn_s_barrier(); }
+INLINE void __kmpc_impl_syncthreads() { llvm_amdgcn_s_barrier(); }
 
 INLINE void __kmpc_impl_named_sync(int barrier, uint32_t num_threads) {
   // we have protected the master warp from releasing from its barrier
@@ -122,15 +128,4 @@ INLINE void __kmpc_impl_named_sync(int barrier, uint32_t num_threads) {
   __builtin_amdgcn_s_barrier();
 }
 
-// DEVICE versions of part of libc
-extern "C" {
-DEVICE __attribute__((noreturn)) void
-__assertfail(const char *, const char *, unsigned, const char *, size_t);
-INLINE static void __assert_fail(const char *__message, const char *__file,
-                                 unsigned int __line, const char *__function) {
-  __assertfail(__message, __file, __line, __function, sizeof(char));
-}
-DEVICE int printf(const char *, ...);
-}
-
 #endif