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[COMMITTED PATCH] Fix soft-fp build warning on sparc about strict aliasing.
- From: David Miller <davem at davemloft dot net>
- To: libc-alpha at sourceware dot org
- Date: Fri, 19 Dec 2014 16:44:30 -0500 (EST)
- Subject: [COMMITTED PATCH] Fix soft-fp build warning on sparc about strict aliasing.
- Authentication-results: sourceware.org; auth=none
* sysdeps/sparc/sparc32/soft-fp/q_neg.c (_Q_neg): Use a union to
access the quad as both a long double and as a series of 4 words.
---
ChangeLog | 3 +++
sysdeps/sparc/sparc32/soft-fp/q_neg.c | 17 +++++++++++------
2 files changed, 14 insertions(+), 6 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index f983898..8c97adc 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
2014-12-19 David S. Miller <davem@davemloft.net>
+ * sysdeps/sparc/sparc32/soft-fp/q_neg.c (_Q_neg): Use a union to
+ access the quad as both a long double and as a series of 4 words.
+
* get-dynamic-info.h (elf_get_dynamic_info): Ignore -Warray-bounds for a
link_map->l_info array access.
diff --git a/sysdeps/sparc/sparc32/soft-fp/q_neg.c b/sysdeps/sparc/sparc32/soft-fp/q_neg.c
index b5049cd..5fb7e1a 100644
--- a/sysdeps/sparc/sparc32/soft-fp/q_neg.c
+++ b/sysdeps/sparc/sparc32/soft-fp/q_neg.c
@@ -24,20 +24,25 @@
long double _Q_neg(const long double a)
{
- long double c = a;
+ union {
+ long double ldbl;
+ UWtype words[4];
+ } c;
+
+ c.ldbl = a;
#if (__BYTE_ORDER == __BIG_ENDIAN)
- ((UWtype *)&c)[0] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
+ c.words[0] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
#elif (__BYTE_ORDER == __LITTLE_ENDIAN) && (W_TYPE_SIZE == 64)
- ((UWtype *)&c)[1] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
+ c.words[1] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
#elif (__BYTE_ORDER == __LITTLE_ENDIAN) && (W_TYPE_SIZE == 32)
- ((UWtype *)&c)[3] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
+ c.words[3] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
#else
FP_DECL_Q(A); FP_DECL_Q(C);
FP_UNPACK_RAW_Q(A, a);
FP_NEG_Q(C, A);
- FP_PACK_RAW_Q(c, C);
+ FP_PACK_RAW_Q(c.ldbl, C);
#endif
- return c;
+ return c.ldbl;
}
--
2.1.2.532.g19b5d50