Date: Sun, 31 Jan 2021 16:07:30 GMT From: Mateusz Guzik <mjg@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 0db6aef407f3 - main - amd64: add a note about simd to libc memset, memmove and memcmp Message-ID: <202101311607.10VG7UGC081358@gitrepo.freebsd.org>
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The branch main has been updated by mjg: URL: https://cgit.FreeBSD.org/src/commit/?id=0db6aef407f30c138982b8cde43189aad098b337 commit 0db6aef407f30c138982b8cde43189aad098b337 Author: Mateusz Guzik <mjg@FreeBSD.org> AuthorDate: 2021-01-31 15:50:34 +0000 Commit: Mateusz Guzik <mjg@FreeBSD.org> CommitDate: 2021-01-31 16:07:19 +0000 amd64: add a note about simd to libc memset, memmove and memcmp --- lib/libc/amd64/string/memcmp.S | 6 ++++++ lib/libc/amd64/string/memmove.S | 6 ++++++ lib/libc/amd64/string/memset.S | 6 ++++++ 3 files changed, 18 insertions(+) diff --git a/lib/libc/amd64/string/memcmp.S b/lib/libc/amd64/string/memcmp.S index 231ab2175804..67c7df280679 100644 --- a/lib/libc/amd64/string/memcmp.S +++ b/lib/libc/amd64/string/memcmp.S @@ -31,6 +31,12 @@ #include <machine/asm.h> __FBSDID("$FreeBSD$"); +/* + * Note: this routine was written with kernel use in mind (read: no simd), + * it is only present in userspace as a temporary measure until something + * better gets imported. + */ + #define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */ ENTRY(memcmp) diff --git a/lib/libc/amd64/string/memmove.S b/lib/libc/amd64/string/memmove.S index 4797140a1c16..3d75ff45c798 100644 --- a/lib/libc/amd64/string/memmove.S +++ b/lib/libc/amd64/string/memmove.S @@ -29,6 +29,12 @@ #include <machine/asm.h> __FBSDID("$FreeBSD$"); +/* + * Note: this routine was written with kernel use in mind (read: no simd), + * it is only present in userspace as a temporary measure until something + * better gets imported. + */ + #define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */ /* diff --git a/lib/libc/amd64/string/memset.S b/lib/libc/amd64/string/memset.S index 0639573a4a3e..050711302354 100644 --- a/lib/libc/amd64/string/memset.S +++ b/lib/libc/amd64/string/memset.S @@ -31,6 +31,12 @@ #include <machine/asm.h> __FBSDID("$FreeBSD$"); +/* + * Note: this routine was written with kernel use in mind (read: no simd), + * it is only present in userspace as a temporary measure until something + * better gets imported. + */ + #define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */ .macro MEMSET erms
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