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uClibc: implement copysignl in libc on powerpc to avoid undefined references in libstdc++

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@18178 3c298f89-4303-0410-b956-a3cf2f4a3e73
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nbd 2009-10-27 01:11:40 +00:00
parent 94780e82b8
commit a6257782ac
1 changed files with 103 additions and 0 deletions
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103
toolchain/uClibc/patches-0.9.30.1/450-powerpc_copysignl.patch Normal file
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@ -0,0 +1,103 @@
--- a/libc/sysdeps/linux/powerpc/Makefile.arch
+++ b/libc/sysdeps/linux/powerpc/Makefile.arch
@@ -5,7 +5,7 @@
# Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
#
-CSRC := __syscall_error.c pread_write.c ioctl.c
+CSRC := __syscall_error.c pread_write.c ioctl.c copysignl.c
SSRC := \
__longjmp.S setjmp.S bsd-setjmp.S bsd-_setjmp.S brk.S \
--- /dev/null
+++ b/libc/sysdeps/linux/powerpc/copysignl.c
@@ -0,0 +1,89 @@
+/* s_copysignl.c -- long double version of s_copysign.c.
+ * Conversion to long double by Ulrich Drepper,
+ * Cygnus Support, drepper@cygnus.com.
+ */
+
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice
+ * is preserved.
+ * ====================================================
+ */
+
+/*
+ * copysignl(long double x, long double y)
+ * copysignl(x,y) returns a value with the magnitude of x and
+ * with the sign bit of y.
+ */
+
+#include <endian.h>
+#include <stdint.h>
+
+#if __FLOAT_WORD_ORDER == BIG_ENDIAN
+
+typedef union
+{
+ long double value;
+ struct
+ {
+ int sign_exponent:16;
+ unsigned int empty:16;
+ uint32_t msw;
+ uint32_t lsw;
+ } parts;
+} ieee_long_double_shape_type;
+
+#endif
+
+#if __FLOAT_WORD_ORDER == LITTLE_ENDIAN
+
+typedef union
+{
+ long double value;
+ struct
+ {
+ uint32_t lsw;
+ uint32_t msw;
+ int sign_exponent:16;
+ unsigned int empty:16;
+ } parts;
+} ieee_long_double_shape_type;
+
+#endif
+
+/* Get int from the exponent of a long double. */
+
+#define GET_LDOUBLE_EXP(exp,d) \
+do { \
+ ieee_long_double_shape_type ge_u; \
+ ge_u.value = (d); \
+ (exp) = ge_u.parts.sign_exponent; \
+} while (0)
+
+/* Set exponent of a long double from an int. */
+
+#define SET_LDOUBLE_EXP(d,exp) \
+do { \
+ ieee_long_double_shape_type se_u; \
+ se_u.value = (d); \
+ se_u.parts.sign_exponent = (exp); \
+ (d) = se_u.value; \
+} while (0)
+
+long double copysignl(long double x, long double y);
+libc_hidden_proto(copysignl);
+
+long double copysignl(long double x, long double y)
+{
+ uint32_t es1,es2;
+ GET_LDOUBLE_EXP(es1,x);
+ GET_LDOUBLE_EXP(es2,y);
+ SET_LDOUBLE_EXP(x,(es1&0x7fff)|(es2&0x8000));
+ return x;
+}
+
+libc_hidden_def(copysignl);