[libc] Default the GPU build to the default memory utilities

[jhuber6]

Summary

A previous patch made this cause an error on the GPU. We have not yet
dedicated time towards an optimial implementaiton there but we do not
want it to cause an error. We simply use the fallback routines.

[gchatelet]

This patch is likely to fail as LIBC_SRC_STRING_MEMORY_UTILS_MEMSET et al. are not defined.

[jhuber6]

In D155615#4511216, @gchatelet wrote:

This patch is likely to fail as LIBC_SRC_STRING_MEMORY_UTILS_MEMSET et al. are not defined.

Had a bit of a mixuup, it's been reverted already. Thanks. Sorry the AMDGPU builder isn't in staging otherwise you'd probably catch this stuff.

libc/src/string/memory_utils/bcmp_implementations.h

 #include "src/string/memory_utils/x86_64/bcmp_implementations.h"
 #define LIBC_SRC_STRING_MEMORY_UTILS_BCMP inline_bcmp_x86
 #elif defined(LIBC_TARGET_ARCH_IS_AARCH64)
 #include "src/string/memory_utils/aarch64/bcmp_implementations.h"
 #define LIBC_SRC_STRING_MEMORY_UTILS_BCMP inline_bcmp_aarch64
 #elif defined(LIBC_TARGET_ARCH_IS_ANY_RISCV)
 #include "src/string/memory_utils/riscv/bcmp_implementations.h"
 #define LIBC_SRC_STRING_MEMORY_UTILS_BCMP inline_bcmp_riscv
+#elif defined(LIBC_TARGET_ARCH_IS_GPU)
+// TODO: Define a more optimal GPU impolementation.
 #else
 // We may want to error instead of defaulting to suboptimal implementation.
 #include "src/string/memory_utils/generic/byte_per_byte.h"
 #define LIBC_SRC_STRING_MEMORY_UTILS_BCMP inline_bcmp_byte_per_byte
 #endif
 
 namespace __llvm_libc {
 

libc/src/string/memory_utils/memcmp_implementations.h

 #include "src/string/memory_utils/x86_64/memcmp_implementations.h"
 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMCMP inline_memcmp_x86
 #elif defined(LIBC_TARGET_ARCH_IS_AARCH64)
 #include "src/string/memory_utils/aarch64/memcmp_implementations.h"
 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMCMP inline_memcmp_aarch64
 #elif defined(LIBC_TARGET_ARCH_IS_ANY_RISCV)
 #include "src/string/memory_utils/riscv/memcmp_implementations.h"
 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMCMP inline_memcmp_riscv
+#elif defined(LIBC_TARGET_ARCH_IS_GPU)
+// TODO: Define a more optimal GPU impolementation.
 #else
 // We may want to error instead of defaulting to suboptimal implementation.
 #include "src/string/memory_utils/generic/byte_per_byte.h"
 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMCMP inline_memcmp_byte_per_byte
 #endif
 
 namespace __llvm_libc {
 

libc/src/string/memory_utils/memcpy_implementations.h

 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMCPY                                    \
   inline_memcpy_x86_maybe_interpose_repmovsb
 #elif defined(LIBC_TARGET_ARCH_IS_AARCH64)
 #include "src/string/memory_utils/aarch64/memcpy_implementations.h"
 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMCPY inline_memcpy_aarch64
 #elif defined(LIBC_TARGET_ARCH_IS_ANY_RISCV)
 #include "src/string/memory_utils/riscv/memcpy_implementations.h"
 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMCPY inline_memcpy_riscv
+#elif defined(LIBC_TARGET_ARCH_IS_GPU)
+// TODO: Define a more optimal GPU impolementation.
 #else
 // We may want to error instead of defaulting to suboptimal implementation.
 #include "src/string/memory_utils/generic/byte_per_byte.h"
 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMCPY inline_memcpy_byte_per_byte
 #endif
 
 namespace __llvm_libc {
 

libc/src/string/memory_utils/memmove_implementations.h

 #include "src/string/memory_utils/x86_64/memmove_implementations.h"
 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMMOVE inline_memmove_x86
 #elif defined(LIBC_TARGET_ARCH_IS_AARCH64)
 #include "src/string/memory_utils/aarch64/memmove_implementations.h"
 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMMOVE inline_memmove_aarch64
 #elif defined(LIBC_TARGET_ARCH_IS_ANY_RISCV)
 #include "src/string/memory_utils/riscv/memmove_implementations.h"
 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMMOVE inline_memmove_riscv
+#elif defined(LIBC_TARGET_ARCH_IS_GPU)
+// TODO: Define a more optimal GPU impolementation.
 #else
 // We may want to error instead of defaulting to suboptimal implementation.
 #include "src/string/memory_utils/generic/byte_per_byte.h"
 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMMOVE inline_memmove_byte_per_byte
 #endif
 
 namespace __llvm_libc {
 
 LIBC_INLINE void inline_memmove(void *dst, const void *src, size_t count) {
   LIBC_SRC_STRING_MEMORY_UTILS_MEMMOVE(reinterpret_cast<Ptr>(dst),
                                        reinterpret_cast<CPtr>(src), count);
 }
 
 } // namespace __llvm_libc
 
 #endif /* LLVM_LIBC_SRC_STRING_MEMORY_UTILS_MEMMOVE_IMPLEMENTATIONS_H */

libc/src/string/memory_utils/memset_implementations.h

 #include "src/string/memory_utils/x86_64/memset_implementations.h"
 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMSET inline_memset_x86
 #elif defined(LIBC_TARGET_ARCH_IS_AARCH64)
 #include "src/string/memory_utils/aarch64/memset_implementations.h"
 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMSET inline_memset_aarch64
 #elif defined(LIBC_TARGET_ARCH_IS_ANY_RISCV)
 #include "src/string/memory_utils/riscv/memset_implementations.h"
 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMSET inline_memset_riscv
+#elif defined(LIBC_TARGET_ARCH_IS_GPU)
+// TODO: Define a more optimal GPU impolementation.
 #else
 // We may want to error instead of defaulting to suboptimal implementation.
 #include "src/string/memory_utils/generic/byte_per_byte.h"
 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMSET inline_memset_byte_per_byte
 #endif
 
 namespace __llvm_libc {