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authorDimitry Andric <dim@FreeBSD.org>2015-09-06 18:41:23 +0000
committerDimitry Andric <dim@FreeBSD.org>2015-09-06 18:41:23 +0000
commitf31bcc68c72371a2bf63aead9f3373a1ff2053b6 (patch)
treeb259e5d585da0f8cde9579939a74d5ef44c72abd /lib/builtins/fp_fixint_impl.inc
parentcd2dd3df15523e2be8d2bbace27641d6ac9fa40d (diff)
downloadsrc-f31bcc68c72371a2bf63aead9f3373a1ff2053b6.tar.gz
src-f31bcc68c72371a2bf63aead9f3373a1ff2053b6.zip
Import compiler-rt 3.7.0 release (r246257).vendor/compiler-rt/compiler-rt-release_370-r246257
Notes
Notes: svn path=/vendor/compiler-rt/dist/; revision=287516 svn path=/vendor/compiler-rt/compiler-rt-release_370-r246257/; revision=287517; tag=vendor/compiler-rt/compiler-rt-release_370-r246257
Diffstat (limited to 'lib/builtins/fp_fixint_impl.inc')
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diff --git a/lib/builtins/fp_fixint_impl.inc b/lib/builtins/fp_fixint_impl.inc
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+//===-- lib/fixdfsi.c - Double-precision -> integer conversion ----*- C -*-===//
+//
+// 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 float to integer conversion for the
+// compiler-rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "fp_lib.h"
+
+static inline fixint_t __fixint(fp_t a) {
+ const fixint_t fixint_max = (fixint_t)((~(fixuint_t)0) / 2);
+ const fixint_t fixint_min = -fixint_max - 1;
+ // Break a into sign, exponent, significand
+ const rep_t aRep = toRep(a);
+ const rep_t aAbs = aRep & absMask;
+ const fixint_t sign = aRep & signBit ? -1 : 1;
+ const int exponent = (aAbs >> significandBits) - exponentBias;
+ const rep_t significand = (aAbs & significandMask) | implicitBit;
+
+ // If exponent is negative, the result is zero.
+ if (exponent < 0)
+ return 0;
+
+ // If the value is too large for the integer type, saturate.
+ if ((unsigned)exponent >= sizeof(fixint_t) * CHAR_BIT)
+ return sign == 1 ? fixint_max : fixint_min;
+
+ // If 0 <= exponent < significandBits, right shift to get the result.
+ // Otherwise, shift left.
+ if (exponent < significandBits)
+ return sign * (significand >> (significandBits - exponent));
+ else
+ return sign * ((fixint_t)significand << (exponent - significandBits));
+}