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