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authorDimitry Andric <dim@FreeBSD.org>2015-01-07 19:55:37 +0000
committerDimitry Andric <dim@FreeBSD.org>2015-01-07 19:55:37 +0000
commitca9211ecdede9bdedb812b2243a4abdb8dacd1b9 (patch)
tree9b19e801150082c33e9152275829a6ce90614b55 /lib/builtins/fixxfdi.c
parent8ef50bf3d1c287b5013c3168de77a462dfce3495 (diff)
downloadsrc-ca9211ecdede9bdedb812b2243a4abdb8dacd1b9.tar.gz
src-ca9211ecdede9bdedb812b2243a4abdb8dacd1b9.zip
Import compiler-rt trunk r224034.vendor/compiler-rt/compiler-rt-r224034
Notes
Notes: svn path=/vendor/compiler-rt/dist/; revision=276789 svn path=/vendor/compiler-rt/compiler-rt-r224034/; revision=276790; tag=vendor/compiler-rt/compiler-rt-r224034
Diffstat (limited to 'lib/builtins/fixxfdi.c')
-rw-r--r--lib/builtins/fixxfdi.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/lib/builtins/fixxfdi.c b/lib/builtins/fixxfdi.c
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+/* ===-- fixxfdi.c - Implement __fixxfdi -----------------------------------===
+ *
+ * The LLVM Compiler Infrastructure
+ *
+ * This file is dual licensed under the MIT and the University of Illinois Open
+ * Source Licenses. See LICENSE.TXT for details.
+ *
+ * ===----------------------------------------------------------------------===
+ *
+ * This file implements __fixxfdi for the compiler_rt library.
+ *
+ * ===----------------------------------------------------------------------===
+ */
+
+#if !_ARCH_PPC
+
+#include "int_lib.h"
+
+/* Returns: convert a to a signed long long, rounding toward zero. */
+
+/* Assumption: long double is an intel 80 bit floating point type padded with 6 bytes
+ * su_int is a 32 bit integral type
+ * value in long double is representable in di_int (no range checking performed)
+ */
+
+/* gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee eeee |
+ * 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm
+ */
+
+COMPILER_RT_ABI di_int
+__fixxfdi(long double a)
+{
+ long_double_bits fb;
+ fb.f = a;
+ int e = (fb.u.high.s.low & 0x00007FFF) - 16383;
+ if (e < 0)
+ return 0;
+ di_int s = -(si_int)((fb.u.high.s.low & 0x00008000) >> 15);
+ di_int r = fb.u.low.all;
+ r = (du_int)r >> (63 - e);
+ return (r ^ s) - s;
+}
+
+#endif /* !_ARCH_PPC */