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[PATCH 06/27] S390: Ifunc resolver macro for vector instructions.
- From: Stefan Liebler <stli at linux dot vnet dot ibm dot com>
- To: libc-alpha at sourceware dot org
- Cc: Stefan Liebler <stli at linux dot vnet dot ibm dot com>
- Date: Fri, 3 Jul 2015 15:38:20 +0200
- Subject: [PATCH 06/27] S390: Ifunc resolver macro for vector instructions.
- Authentication-results: sourceware.org; auth=none
- References: <1435930721-27922-1-git-send-email-stli at linux dot vnet dot ibm dot com>
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");
--
1.8.4.2