x86-64: Implement strcspn/strpbrk/strspn IFUNC selectors in C

Implement strcspn/strpbrk/strspn IFUNC selectors in C

All internal calls within libc.so can use IFUNC on x86-64 since unlike
x86, x86-64 supports PC-relative addressing to access the GOT entry so
that it can call via PLT without using an extra register.  For libc.a,
we can't use IFUNC for functions which are called before IFUNC has been
initialized.  Use IFUNC internally reduces the icache footprint since
libc.so and other codes in the process use the same implementations.
This patch uses IFUNC for strcspn/strpbrk/strspn functions within libc.

	* sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add
	strcspn-sse2, strpbrk-sse2 and strspn-sse2.
	* sysdeps/x86_64/strcspn.S (STRPBRK_P): Removed.
	Check USE_AS_STRPBRK instead of STRPBRK_P.
	* sysdeps/x86_64/strpbrk.S (USE_AS_STRPBRK): New.
	* sysdeps/x86_64/multiarch/ifunc-sse4_2.h: New file.
	* sysdeps/x86_64/multiarch/strcspn-sse2.S: Likewise.
	* sysdeps/x86_64/multiarch/strcspn.c: Likewise.
	* sysdeps/x86_64/multiarch/strpbrk-sse2.S: Likewise.
	* sysdeps/x86_64/multiarch/strpbrk.c: Likewise.
	* sysdeps/x86_64/multiarch/strspn-sse2.S: Likewise.
	* sysdeps/x86_64/multiarch/strspn.c: Likewise.
	* sysdeps/x86_64/multiarch/strcspn.S: Removed.
	* sysdeps/x86_64/multiarch/strpbrk.S: Likewise.
	* sysdeps/x86_64/multiarch/strspn.S: Likewise.
	* sysdeps/x86_64/multiarch/strpbrk-c.c: Remove "#ifdef SHARED"
	and "#endif".

1 files changed, 1 insertions, 0 deletions

diff --git a/sysdeps/x86_64/strpbrk.S b/sysdeps/x86_64/strpbrk.S
index 9b97ada84e..21888a5b92 100644
--- a/sysdeps/x86_64/strpbrk.S
+++ b/sysdeps/x86_64/strpbrk.S
@@ -1,2 +1,3 @@
 #define strcspn strpbrk
+#define USE_AS_STRPBRK
 #include <sysdeps/x86_64/strcspn.S>