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authored <ed@FreeBSD.org>2010-11-11 15:13:11 +0000
committered <ed@FreeBSD.org>2010-11-11 15:13:11 +0000
commit870837e3e92f721a44db51308f2b900d928fb04f (patch)
tree9f851f7f6da4a4d9010d26bf17881d3bc5320f2b /contrib/compiler-rt/lib/fixsfti.c
parenta1b6fa69a6f674978270e402b8bba6552e152066 (diff)
parent653bb6745595746d04ad4acacaaab66caaaeb69b (diff)
downloadFreeBSD-src-870837e3e92f721a44db51308f2b900d928fb04f.zip
FreeBSD-src-870837e3e92f721a44db51308f2b900d928fb04f.tar.gz
Import libcompiler_rt into HEAD and add Makefiles.
Obtained from: user/ed/compiler-rt
Diffstat (limited to 'contrib/compiler-rt/lib/fixsfti.c')
-rw-r--r--contrib/compiler-rt/lib/fixsfti.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/contrib/compiler-rt/lib/fixsfti.c b/contrib/compiler-rt/lib/fixsfti.c
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+++ b/contrib/compiler-rt/lib/fixsfti.c
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+/* ===-- fixsfti.c - Implement __fixsfti -----------------------------------===
+ *
+ * The LLVM Compiler Infrastructure
+ *
+ * This file is distributed under the University of Illinois Open Source
+ * License. See LICENSE.TXT for details.
+ *
+ * ===----------------------------------------------------------------------===
+ *
+ * This file implements __fixsfti for the compiler_rt library.
+ *
+ * ===----------------------------------------------------------------------===
+ */
+
+#if __x86_64
+
+#include "int_lib.h"
+
+/* Returns: convert a to a signed long long, rounding toward zero. */
+
+/* Assumption: float is a IEEE 32 bit floating point type
+ * su_int is a 32 bit integral type
+ * value in float is representable in ti_int (no range checking performed)
+ */
+
+/* seee eeee emmm mmmm mmmm mmmm mmmm mmmm */
+
+ti_int
+__fixsfti(float a)
+{
+ float_bits fb;
+ fb.f = a;
+ int e = ((fb.u & 0x7F800000) >> 23) - 127;
+ if (e < 0)
+ return 0;
+ ti_int s = (si_int)(fb.u & 0x80000000) >> 31;
+ ti_int r = (fb.u & 0x007FFFFF) | 0x00800000;
+ if (e > 23)
+ r <<= (e - 23);
+ else
+ r >>= (23 - e);
+ return (r ^ s) - s;
+}
+
+#endif
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