[llvm-commits] [compiler-rt] r107535 - in /compiler-rt/trunk/lib: floatsidf.c floatsisf.c floatunssidf.c floatunssisf.c
Stephen Canon
scanon at apple.com
Fri Jul 2 16:05:46 PDT 2010
Author: scanon
Date: Fri Jul 2 18:05:46 2010
New Revision: 107535
URL: http://llvm.org/viewvc/llvm-project?rev=107535&view=rev
Log:
[unsigned] int -> float soft-float conversions for single- and double-precision
Added:
compiler-rt/trunk/lib/floatsidf.c
compiler-rt/trunk/lib/floatsisf.c
compiler-rt/trunk/lib/floatunssidf.c
compiler-rt/trunk/lib/floatunssisf.c
Added: compiler-rt/trunk/lib/floatsidf.c
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/floatsidf.c?rev=107535&view=auto
==============================================================================
--- compiler-rt/trunk/lib/floatsidf.c (added)
+++ compiler-rt/trunk/lib/floatsidf.c Fri Jul 2 18:05:46 2010
@@ -0,0 +1,54 @@
+//===-- lib/floatsidf.c - integer -> double-precision 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 integer to double-precision conversion for the
+// compiler-rt library in the IEEE-754 default round-to-nearest, ties-to-even
+// mode.
+//
+//===----------------------------------------------------------------------===//
+
+#define DOUBLE_PRECISION
+#include "fp_lib.h"
+
+fp_t __floatsidf(int a) {
+
+ const int aWidth = sizeof a * CHAR_BIT;
+
+ // Handle zero as a special case to protect clz
+ if (a == 0)
+ return fromRep(0);
+
+ // All other cases begin by extracting the sign and absolute value of a
+ rep_t sign = 0;
+ if (a < 0) {
+ sign = signBit;
+ a = -a;
+ }
+
+ // Exponent of (fp_t)a is the width of abs(a).
+ const int exponent = (aWidth - 1) - __builtin_clz(a);
+ rep_t result;
+
+ // Shift a into the significand field, rounding if it is a right-shift
+ if (exponent <= significandBits) {
+ const int shift = significandBits - exponent;
+ result = (rep_t)a << shift ^ implicitBit;
+ } else {
+ const int shift = exponent - significandBits;
+ result = (rep_t)a >> shift ^ implicitBit;
+ rep_t round = (rep_t)a << (typeWidth - shift);
+ if (round > signBit) result++;
+ if (round == signBit) result += result & 1;
+ }
+
+ // Insert the exponent
+ result += (rep_t)(exponent + exponentBias) << significandBits;
+ // Insert the sign bit and return
+ return fromRep(result | sign);
+}
Added: compiler-rt/trunk/lib/floatsisf.c
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/floatsisf.c?rev=107535&view=auto
==============================================================================
--- compiler-rt/trunk/lib/floatsisf.c (added)
+++ compiler-rt/trunk/lib/floatsisf.c Fri Jul 2 18:05:46 2010
@@ -0,0 +1,54 @@
+//===-- lib/floatsisf.c - integer -> single-precision 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 integer to single-precision conversion for the
+// compiler-rt library in the IEEE-754 default round-to-nearest, ties-to-even
+// mode.
+//
+//===----------------------------------------------------------------------===//
+
+#define SINGLE_PRECISION
+#include "fp_lib.h"
+
+fp_t __floatsisf(int a) {
+
+ const int aWidth = sizeof a * CHAR_BIT;
+
+ // Handle zero as a special case to protect clz
+ if (a == 0)
+ return fromRep(0);
+
+ // All other cases begin by extracting the sign and absolute value of a
+ rep_t sign = 0;
+ if (a < 0) {
+ sign = signBit;
+ a = -a;
+ }
+
+ // Exponent of (fp_t)a is the width of abs(a).
+ const int exponent = (aWidth - 1) - __builtin_clz(a);
+ rep_t result;
+
+ // Shift a into the significand field, rounding if it is a right-shift
+ if (exponent <= significandBits) {
+ const int shift = significandBits - exponent;
+ result = (rep_t)a << shift ^ implicitBit;
+ } else {
+ const int shift = exponent - significandBits;
+ result = (rep_t)a >> shift ^ implicitBit;
+ rep_t round = (rep_t)a << (typeWidth - shift);
+ if (round > signBit) result++;
+ if (round == signBit) result += result & 1;
+ }
+
+ // Insert the exponent
+ result += (rep_t)(exponent + exponentBias) << significandBits;
+ // Insert the sign bit and return
+ return fromRep(result | sign);
+}
Added: compiler-rt/trunk/lib/floatunssidf.c
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/floatunssidf.c?rev=107535&view=auto
==============================================================================
--- compiler-rt/trunk/lib/floatunssidf.c (added)
+++ compiler-rt/trunk/lib/floatunssidf.c Fri Jul 2 18:05:46 2010
@@ -0,0 +1,45 @@
+//===-- lib/floatunssidf.c - uint -> double-precision 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 unsigned integer to double-precision conversion for the
+// compiler-rt library in the IEEE-754 default round-to-nearest, ties-to-even
+// mode.
+//
+//===----------------------------------------------------------------------===//
+
+#define DOUBLE_PRECISION
+#include "fp_lib.h"
+
+fp_t __floatunssidf(unsigned int a) {
+
+ const int aWidth = sizeof a * CHAR_BIT;
+
+ // Handle zero as a special case to protect clz
+ if (a == 0) return fromRep(0);
+
+ // Exponent of (fp_t)a is the width of abs(a).
+ const int exponent = (aWidth - 1) - __builtin_clz(a);
+ rep_t result;
+
+ // Shift a into the significand field, rounding if it is a right-shift
+ if (exponent <= significandBits) {
+ const int shift = significandBits - exponent;
+ result = (rep_t)a << shift ^ implicitBit;
+ } else {
+ const int shift = exponent - significandBits;
+ result = (rep_t)a >> shift ^ implicitBit;
+ rep_t round = (rep_t)a << (typeWidth - shift);
+ if (round > signBit) result++;
+ if (round == signBit) result += result & 1;
+ }
+
+ // Insert the exponent
+ result += (rep_t)(exponent + exponentBias) << significandBits;
+ return fromRep(result);
+}
Added: compiler-rt/trunk/lib/floatunssisf.c
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/floatunssisf.c?rev=107535&view=auto
==============================================================================
--- compiler-rt/trunk/lib/floatunssisf.c (added)
+++ compiler-rt/trunk/lib/floatunssisf.c Fri Jul 2 18:05:46 2010
@@ -0,0 +1,45 @@
+//===-- lib/floatunssisf.c - uint -> single-precision 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 unsigned integer to single-precision conversion for the
+// compiler-rt library in the IEEE-754 default round-to-nearest, ties-to-even
+// mode.
+//
+//===----------------------------------------------------------------------===//
+
+#define SINGLE_PRECISION
+#include "fp_lib.h"
+
+fp_t __floatunssisf(unsigned int a) {
+
+ const int aWidth = sizeof a * CHAR_BIT;
+
+ // Handle zero as a special case to protect clz
+ if (a == 0) return fromRep(0);
+
+ // Exponent of (fp_t)a is the width of abs(a).
+ const int exponent = (aWidth - 1) - __builtin_clz(a);
+ rep_t result;
+
+ // Shift a into the significand field, rounding if it is a right-shift
+ if (exponent <= significandBits) {
+ const int shift = significandBits - exponent;
+ result = (rep_t)a << shift ^ implicitBit;
+ } else {
+ const int shift = exponent - significandBits;
+ result = (rep_t)a >> shift ^ implicitBit;
+ rep_t round = (rep_t)a << (typeWidth - shift);
+ if (round > signBit) result++;
+ if (round == signBit) result += result & 1;
+ }
+
+ // Insert the exponent
+ result += (rep_t)(exponent + exponentBias) << significandBits;
+ return fromRep(result);
+}
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