[Headers] Implement spirvamdgcnintrin.h

Author: JonChesterfield

clang/lib/Headers/amdgpuintrin.h

@@ -1,4 +1,4 @@
-//===-- amdgpuintrin.h - AMDPGU intrinsic functions -----------------------===//
+//===-- amdgpuintrin.h - AMDGPU intrinsic functions -----------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.

clang/lib/Headers/gpuintrin.h

@@ -59,7 +59,11 @@ _Pragma("omp end declare target");
 #if defined(__NVPTX__)
 #include <nvptxintrin.h>
 #elif defined(__AMDGPU__)
+#if defined(__SPIRV64__)
+#include <spirvamdgpuintrin.h>
+#else
 #include <amdgpuintrin.h>
+#endif
 #elif !defined(_OPENMP)
 #error "This header is only meant to be used on GPU architectures."
 #endif

clang/lib/Headers/spirvamdgpuintrin.h

@@ -0,0 +1,191 @@
+//===-- spirvamdgpuintrin.h - spirv amdgpu intrinsic functions -----------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __SPIRVAMDGPUINTRIN_H
+#define __SPIRVAMDGPUINTRIN_H
+
+#if !defined( __SPIRV64__) || !defined(__AMDGPU__)
+#error "This file is intended for the spirv64-amd-amdhsa target"
+#endif
+
+#ifndef __GPUINTRIN_H
+#error "Never use <spirvamdgcnintrin.h> directly; include <gpuintrin.h> instead"
+#endif
+
+_Pragma("omp begin declare target device_type(nohost)");
+_Pragma("omp begin declare variant match(device = {arch(amdgcn)})");
+
+// Type aliases to the address spaces used by the SPIRV64 AMDGPU backend.
+#define __gpu_private __attribute__((address_space(0)))
+#define __gpu_constant __attribute__((address_space(1)))
+#define __gpu_local __attribute__((address_space(3)))
+#define __gpu_global __attribute__((address_space(1)))
+#define __gpu_generic __attribute__((address_space(4)))
+
+// Attribute to declare a function as a kernel is not available on spirv
+#define __gpu_kernel
+
+// Returns the number of workgroups in the 'x' dimension of the grid.
+_DEFAULT_FN_ATTRS static __inline__ uint32_t __gpu_num_blocks_x(void) {
+  return __builtin_amdgcn_grid_size_x() / __builtin_amdgcn_workgroup_size_x();
+}
+
+// Returns the number of workgroups in the 'y' dimension of the grid.
+_DEFAULT_FN_ATTRS static __inline__ uint32_t __gpu_num_blocks_y(void) {
+  return __builtin_amdgcn_grid_size_y() / __builtin_amdgcn_workgroup_size_y();
+}
+
+// Returns the number of workgroups in the 'z' dimension of the grid.
+_DEFAULT_FN_ATTRS static __inline__ uint32_t __gpu_num_blocks_z(void) {
+  return __builtin_amdgcn_grid_size_z() / __builtin_amdgcn_workgroup_size_z();
+}
+
+// Returns the 'x' dimension of the current AMD workgroup's id.
+_DEFAULT_FN_ATTRS static __inline__ uint32_t __gpu_block_id_x(void) {
+  return __builtin_amdgcn_workgroup_id_x();
+}
+
+// Returns the 'y' dimension of the current AMD workgroup's id.
+_DEFAULT_FN_ATTRS static __inline__ uint32_t __gpu_block_id_y(void) {
+  return __builtin_amdgcn_workgroup_id_y();
+}
+
+// Returns the 'z' dimension of the current AMD workgroup's id.
+_DEFAULT_FN_ATTRS static __inline__ uint32_t __gpu_block_id_z(void) {
+  return __builtin_amdgcn_workgroup_id_z();
+}
+
+// Returns the number of workitems in the 'x' dimension.
+_DEFAULT_FN_ATTRS static __inline__ uint32_t __gpu_num_threads_x(void) {
+  return __builtin_amdgcn_workgroup_size_x();
+}
+
+// Returns the number of workitems in the 'y' dimension.
+_DEFAULT_FN_ATTRS static __inline__ uint32_t __gpu_num_threads_y(void) {
+  return __builtin_amdgcn_workgroup_size_y();
+}
+
+// Returns the number of workitems in the 'z' dimension.
+_DEFAULT_FN_ATTRS static __inline__ uint32_t __gpu_num_threads_z(void) {
+  return __builtin_amdgcn_workgroup_size_z();
+}
+
+// Returns the 'x' dimension id of the workitem in the current AMD workgroup.
+_DEFAULT_FN_ATTRS static __inline__ uint32_t __gpu_thread_id_x(void) {
+  return __builtin_amdgcn_workitem_id_x();
+}
+
+// Returns the 'y' dimension id of the workitem in the current AMD workgroup.
+_DEFAULT_FN_ATTRS static __inline__ uint32_t __gpu_thread_id_y(void) {
+  return __builtin_amdgcn_workitem_id_y();
+}
+
+// Returns the 'z' dimension id of the workitem in the current AMD workgroup.
+_DEFAULT_FN_ATTRS static __inline__ uint32_t __gpu_thread_id_z(void) {
+  return __builtin_amdgcn_workitem_id_z();
+}
+
+// Returns the size of an AMD wavefront, either 32 or 64 depending on hardware
+// and compilation options.
+_DEFAULT_FN_ATTRS static __inline__ uint32_t __gpu_num_lanes(void) {
+  return __builtin_amdgcn_wavefrontsize();
+}
+
+// Returns the id of the thread inside of an AMD wavefront executing together.
+_DEFAULT_FN_ATTRS static __inline__ uint32_t __gpu_lane_id(void) {
+  return __builtin_amdgcn_mbcnt_hi(~0u, __builtin_amdgcn_mbcnt_lo(~0u, 0u));
+}
+
+// Returns the bit-mask of active threads in the current wavefront.
+_DEFAULT_FN_ATTRS static __inline__ uint64_t __gpu_lane_mask(void) {
+  return __builtin_amdgcn_read_exec();
+}
+
+// Copies the value from the first active thread in the wavefront to the rest.
+_DEFAULT_FN_ATTRS static __inline__ uint32_t
+__gpu_read_first_lane_u32(uint64_t __lane_mask, uint32_t __x) {
+  return __builtin_amdgcn_readfirstlane(__x);
+}
+
+// Returns a bitmask of threads in the current lane for which \p x is true.
+_DEFAULT_FN_ATTRS static __inline__ uint64_t __gpu_ballot(uint64_t __lane_mask,
+                                                          bool __x) {
+  // The lane_mask & gives the nvptx semantics when lane_mask is a subset of
+  // the active threads
+  return __lane_mask & __builtin_amdgcn_ballot_w64(__x);
+}
+
+// Waits for all the threads in the block to converge and issues a fence.
+_DEFAULT_FN_ATTRS static __inline__ void __gpu_sync_threads(void) {
+  __builtin_amdgcn_s_barrier();
+  __builtin_amdgcn_fence(__ATOMIC_SEQ_CST, "workgroup");
+}
+
+// Wait for all threads in the wavefront to converge, this is a noop on AMDGPU.
+_DEFAULT_FN_ATTRS static __inline__ void __gpu_sync_lane(uint64_t __lane_mask) {
+  __builtin_amdgcn_wave_barrier();
+}
+
+// Shuffles the the lanes inside the wavefront according to the given index.
+_DEFAULT_FN_ATTRS static __inline__ uint32_t
+__gpu_shuffle_idx_u32(uint64_t __lane_mask, uint32_t __idx, uint32_t __x,
+                      uint32_t __width) {
+  uint32_t __lane = __idx + (__gpu_lane_id() & ~(__width - 1));
+  return __builtin_amdgcn_ds_bpermute(__lane << 2, __x);
+}
+
+// Returns a bitmask marking all lanes that have the same value of __x.
+_DEFAULT_FN_ATTRS static __inline__ uint64_t
+__gpu_match_any_u32(uint64_t __lane_mask, uint32_t __x) {
+  return __gpu_match_any_u32_impl(__lane_mask, __x);
+}
+
+// Returns a bitmask marking all lanes that have the same value of __x.
+_DEFAULT_FN_ATTRS static __inline__ uint64_t
+__gpu_match_any_u64(uint64_t __lane_mask, uint64_t __x) {
+  return __gpu_match_any_u64_impl(__lane_mask, __x);
+}
+
+// Returns the current lane mask if every lane contains __x.
+_DEFAULT_FN_ATTRS static __inline__ uint64_t
+__gpu_match_all_u32(uint64_t __lane_mask, uint32_t __x) {
+  return __gpu_match_all_u32_impl(__lane_mask, __x);
+}
+
+// Returns the current lane mask if every lane contains __x.
+_DEFAULT_FN_ATTRS static __inline__ uint64_t
+__gpu_match_all_u64(uint64_t __lane_mask, uint64_t __x) {
+  return __gpu_match_all_u64_impl(__lane_mask, __x);
+}
+
+// Returns true if the flat pointer points to AMDGPU 'shared' memory.
+_DEFAULT_FN_ATTRS static __inline__ bool __gpu_is_ptr_local(void *ptr) {
+  return __builtin_amdgcn_is_shared((void [[clang::address_space(0)]] *)((
+      void [[clang::opencl_generic]] *)ptr));
+}
+
+// Returns true if the flat pointer points to AMDGPU 'private' memory.
+_DEFAULT_FN_ATTRS static __inline__ bool __gpu_is_ptr_private(void *ptr) {
+  return __builtin_amdgcn_is_private((void [[clang::address_space(0)]] *)((
+      void [[clang::opencl_generic]] *)ptr));
+}
+
+// Terminates execution of the associated wavefront.
+_DEFAULT_FN_ATTRS [[noreturn]] static __inline__ void __gpu_exit(void) {
+  __builtin_amdgcn_endpgm();
+}
+
+// Suspend the thread briefly to assist the scheduler during busy loops.
+_DEFAULT_FN_ATTRS static __inline__ void __gpu_thread_suspend(void) {
+  __builtin_amdgcn_s_sleep(2);
+}
+
+_Pragma("omp end declare variant");
+_Pragma("omp end declare target");
+
+#endif // __SPIRVAMDGPUINTRIN_H