From fb8722735f50cd51204bfbeefa2e5e7e9ff5b2be Mon Sep 17 00:00:00 2001 From: "Jason A. Donenfeld" Date: Fri, 3 Nov 2017 15:18:58 +0100 Subject: arm64: support __int128 on gcc 5+ Versions of gcc prior to gcc 5 emitted a __multi3 function call when dealing with TI types, resulting in failures when trying to link to libgcc, and more generally, bad performance. However, since gcc 5, the compiler supports actually emitting fast instructions, which means we can at long last enable this option and receive the speedups. The gcc commit that added proper Aarch64 support is: https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=d1ae7bb994f49316f6f63e6173f2931e837a351d This commit appears to be part of the gcc 5 release. There are still a few instructions, __ashlti3 and __ashrti3, which require libgcc, which is fine. Rather than linking to libgcc, we simply provide them ourselves, since they're not that complicated. Signed-off-by: Jason A. Donenfeld Signed-off-by: Will Deacon --- arch/arm64/lib/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/arm64/lib/Makefile') diff --git a/arch/arm64/lib/Makefile b/arch/arm64/lib/Makefile index a0abc142c92be..55bdb01f1ea66 100644 --- a/arch/arm64/lib/Makefile +++ b/arch/arm64/lib/Makefile @@ -2,7 +2,7 @@ lib-y := bitops.o clear_user.o delay.o copy_from_user.o \ copy_to_user.o copy_in_user.o copy_page.o \ clear_page.o memchr.o memcpy.o memmove.o memset.o \ memcmp.o strcmp.o strncmp.o strlen.o strnlen.o \ - strchr.o strrchr.o + strchr.o strrchr.o tishift.o # Tell the compiler to treat all general purpose registers (with the # exception of the IP registers, which are already handled by the caller -- cgit v1.2.3