[llvm-commits] [compiler-rt] r107524 - in /compiler-rt/trunk/lib: fixdfsi.c fixsfsi.c
Stephen Canon
scanon at apple.com
Fri Jul 2 15:10:59 PDT 2010
Author: scanon
Date: Fri Jul 2 17:10:58 2010
New Revision: 107524
URL: http://llvm.org/viewvc/llvm-project?rev=107524&view=rev
Log:
float- and double-to-integer soft-float conversions for compiler-rt
Added:
compiler-rt/trunk/lib/fixdfsi.c
compiler-rt/trunk/lib/fixsfsi.c
Added: compiler-rt/trunk/lib/fixdfsi.c
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/fixdfsi.c?rev=107524&view=auto
==============================================================================
--- compiler-rt/trunk/lib/fixdfsi.c (added)
+++ compiler-rt/trunk/lib/fixdfsi.c Fri Jul 2 17:10:58 2010
@@ -0,0 +1,45 @@
+//===-- lib/fixdfsi.c - Double-precision -> integer conversion ----*- C -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements double-precision to integer conversion for the
+// compiler-rt library. No range checking is performed; the behavior of this
+// conversion is undefined for out of range values in the C standard.
+//
+//===----------------------------------------------------------------------===//
+
+#define DOUBLE_PRECISION
+#include "fp_lib.h"
+
+int __fixdfsi(fp_t a) {
+
+ // Break a into sign, exponent, significand
+ const rep_t aRep = toRep(a);
+ const rep_t aAbs = aRep & absMask;
+ const int sign = aRep & signBit ? -1 : 1;
+ const int exponent = (aAbs >> significandBits) - exponentBias;
+ const rep_t significand = (aAbs & significandMask) | implicitBit;
+
+ // If 0 < exponent < significandBits, right shift to get the result.
+ if ((unsigned int)exponent < significandBits) {
+ return sign * (significand >> (significandBits - exponent));
+ }
+
+ // If exponent is negative, the result is zero.
+ else if (exponent < 0) {
+ return 0;
+ }
+
+ // If significandBits < exponent, left shift to get the result. This shift
+ // may end up being larger than the type width, which incurs undefined
+ // behavior, but the conversion itself is undefined in that case, so
+ // whatever the compiler decides to do is fine.
+ else {
+ return sign * (significand << (exponent - significandBits));
+ }
+}
Added: compiler-rt/trunk/lib/fixsfsi.c
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/fixsfsi.c?rev=107524&view=auto
==============================================================================
--- compiler-rt/trunk/lib/fixsfsi.c (added)
+++ compiler-rt/trunk/lib/fixsfsi.c Fri Jul 2 17:10:58 2010
@@ -0,0 +1,45 @@
+//===-- lib/fixsfsi.c - Single-precision -> integer conversion ----*- C -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements single-precision to integer conversion for the
+// compiler-rt library. No range checking is performed; the behavior of this
+// conversion is undefined for out of range values in the C standard.
+//
+//===----------------------------------------------------------------------===//
+
+#define SINGLE_PRECISION
+#include "fp_lib.h"
+
+int __fixsfsi(fp_t a) {
+
+ // Break a into sign, exponent, significand
+ const rep_t aRep = toRep(a);
+ const rep_t aAbs = aRep & absMask;
+ const int sign = aRep & signBit ? -1 : 1;
+ const int exponent = (aAbs >> significandBits) - exponentBias;
+ const rep_t significand = (aAbs & significandMask) | implicitBit;
+
+ // If 0 < exponent < significandBits, right shift to get the result.
+ if ((unsigned int)exponent < significandBits) {
+ return sign * (significand >> (significandBits - exponent));
+ }
+
+ // If exponent is negative, the result is zero.
+ else if (exponent < 0) {
+ return 0;
+ }
+
+ // If significandBits < exponent, left shift to get the result. This shift
+ // may end up being larger than the type width, which incurs undefined
+ // behavior, but the conversion itself is undefined in that case, so
+ // whatever the compiler decides to do is fine.
+ else {
+ return sign * (significand << (exponent - significandBits));
+ }
+}
More information about the llvm-commits
mailing list