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From 480b65cae6c20a41aa698a6c9d3b260f6f744004 Mon Sep 17 00:00:00 2001
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From: Ilya Leoshkevich <iii@linux.ibm.com>
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Date: Thu, 2 Feb 2023 19:41:32 +0100
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Subject: [PATCH] 0003-PATCH-Fix-clang-s-behavior-on-versions-7.patch
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---
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contrib/power/clang_workaround.h | 15 ++++++++++-----
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1 file changed, 10 insertions(+), 5 deletions(-)
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diff --git a/contrib/power/clang_workaround.h b/contrib/power/clang_workaround.h
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index b5e7dae..915f7e5 100644
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--- a/contrib/power/clang_workaround.h
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+++ b/contrib/power/clang_workaround.h
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@@ -39,7 +39,12 @@ __vector unsigned long long __builtin_pack_vector (unsigned long __a,
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return __v;
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}
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-#ifndef vec_xxpermdi
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+/*
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+ * Clang 7 changed the behavior of vec_xxpermdi in order to provide the same
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+ * behavior of GCC. That means code adapted to Clang >= 7 does not work on
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+ * Clang <= 6. So, fallback to __builtin_unpack_vector() on Clang <= 6.
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+ */
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+#if !defined vec_xxpermdi || __clang_major__ <= 6
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static inline
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unsigned long __builtin_unpack_vector (__vector unsigned long long __v,
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@@ -62,9 +67,9 @@ static inline
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unsigned long __builtin_unpack_vector_0 (__vector unsigned long long __v)
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{
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#if defined(__BIG_ENDIAN__)
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- return vec_xxpermdi(__v, __v, 0x0)[1];
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- #else
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return vec_xxpermdi(__v, __v, 0x0)[0];
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+ #else
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+ return vec_xxpermdi(__v, __v, 0x3)[0];
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#endif
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}
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@@ -72,9 +77,9 @@ static inline
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unsigned long __builtin_unpack_vector_1 (__vector unsigned long long __v)
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{
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#if defined(__BIG_ENDIAN__)
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- return vec_xxpermdi(__v, __v, 0x3)[1];
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- #else
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return vec_xxpermdi(__v, __v, 0x3)[0];
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+ #else
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+ return vec_xxpermdi(__v, __v, 0x0)[0];
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#endif
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}
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#endif /* vec_xxpermdi */
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--
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2.39.1
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