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[06/27] S390: Ifunc resolver macro for vector instructions.

Message ID 1435930721-27922-7-git-send-email-stli@linux.vnet.ibm.com
State New
Headers show

Commit Message

Stefan Liebler July 3, 2015, 1:38 p.m. UTC 
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(+)
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Patch

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");