From b13a91507798183556d7e1891fe3d4cd3a947aa6 Mon Sep 17 00:00:00 2001
From: Stefan Liebler <stli@linux.vnet.ibm.com>
Date: Thu, 8 Oct 2015 10:48:13 +0200
Subject: [PATCH 09/30] S390: Ifunc resolver macro for vector instructions.
upstream-commit-id: fd484e057dd4d2813182df08584a4c48d6f1dd7a
https://www.sourceware.org/ml/libc-alpha/2015-07/msg00076.html
This patch introduces a s390 specific ifunc resolver macro for 32/64bit,
which chooses <func>_vx with vector instructions if HWCAP_S390_VX flag
in hwcaps is set or <func>_c if not.
ChangeLog:
* sysdeps/s390/multiarch/ifunc-resolve.h (s390_vx_libc_ifunc,
s390_vx_libc_ifunc2): New macro function.
---
sysdeps/s390/multiarch/ifunc-resolve.h | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/sysdeps/s390/multiarch/ifunc-resolve.h b/sysdeps/s390/multiarch/ifunc-resolve.h
index 491df68..e9fd90e 100644
--- a/sysdeps/s390/multiarch/ifunc-resolve.h
+++ b/sysdeps/s390/multiarch/ifunc-resolve.h
@@ -73,3 +73,22 @@
else \
return &__##FUNC##_default; \
}
+
+#define s390_vx_libc_ifunc(FUNC) \
+ s390_vx_libc_ifunc2(FUNC, FUNC)
+
+#define s390_vx_libc_ifunc2(RESOLVERFUNC, FUNC) \
+ /* Make the declarations of the optimized functions hidden in order
+ to prevent GOT slots being generated for them. */ \
+ extern __typeof (FUNC) RESOLVERFUNC##_vx attribute_hidden; \
+ extern __typeof (FUNC) RESOLVERFUNC##_c attribute_hidden; \
+ extern void *__resolve_##RESOLVERFUNC (unsigned long int) __asm__ (#FUNC); \
+ \
+ void *__resolve_##RESOLVERFUNC (unsigned long int dl_hwcap) \
+ { \
+ if (dl_hwcap & HWCAP_S390_VX) \
+ return &RESOLVERFUNC##_vx; \
+ else \
+ return &RESOLVERFUNC##_c; \
+ } \
+ __asm__ (".type " #FUNC ", %gnu_indirect_function");
--
2.3.0