Author: emaste Date: Tue Apr 7 19:31:29 2015 New Revision: 281223 URL: https://svnweb.freebsd.org/changeset/base/281223
Log: compiler-rt: add floatditf and floatunditf These are long integer (di_int/du_int) to quad precision floating point conversions. They may be reworked based on upstream discussion. These versions are here to support arm64 world builds. Reviewed by: ed Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D2174 Added: head/contrib/compiler-rt/lib/builtins/floatditf.c (contents, props changed) head/contrib/compiler-rt/lib/builtins/floatunditf.c (contents, props changed) Modified: head/lib/libcompiler_rt/Makefile Added: head/contrib/compiler-rt/lib/builtins/floatditf.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/contrib/compiler-rt/lib/builtins/floatditf.c Tue Apr 7 19:31:29 2015 (r281223) @@ -0,0 +1,52 @@ +//===-- lib/floatditf.c - integer -> quad-precision 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 di_int to quad-precision conversion for the +// compiler-rt library in the IEEE-754 default round-to-nearest, ties-to-even +// mode. +// +//===----------------------------------------------------------------------===// + +#define QUAD_PRECISION +#include "fp_lib.h" + +#if defined(CRT_HAS_128BIT) && defined(CRT_LDBL_128BIT) +COMPILER_RT_ABI fp_t __floatditf(di_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; + unsigned aAbs = (unsigned)a; + if (a < 0) { + sign = signBit; + aAbs += 0x80000000; + } + + // 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 and clear the implicit bit. Extra + // cast to unsigned int is necessary to get the correct behavior for + // the input INT_MIN. + const int shift = significandBits - exponent; + result = (rep_t)aAbs << shift ^ implicitBit; + + // Insert the exponent + result += (rep_t)(exponent + exponentBias) << significandBits; + // Insert the sign bit and return + return fromRep(result | sign); +} + +#endif Added: head/contrib/compiler-rt/lib/builtins/floatunditf.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/contrib/compiler-rt/lib/builtins/floatunditf.c Tue Apr 7 19:31:29 2015 (r281223) @@ -0,0 +1,40 @@ +//===-- lib/floatunditf.c - uint -> quad-precision 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 du_int to quad-precision conversion for the +// compiler-rt library in the IEEE-754 default round-to-nearest, ties-to-even +// mode. +// +//===----------------------------------------------------------------------===// + +#define QUAD_PRECISION +#include "fp_lib.h" + +#if defined(CRT_HAS_128BIT) && defined(CRT_LDBL_128BIT) +COMPILER_RT_ABI fp_t __floatunditf(du_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 and clear the implicit bit. + const int shift = significandBits - exponent; + result = (rep_t)a << shift ^ implicitBit; + + // Insert the exponent + result += (rep_t)(exponent + exponentBias) << significandBits; + return fromRep(result); +} + +#endif Modified: head/lib/libcompiler_rt/Makefile ============================================================================== --- head/lib/libcompiler_rt/Makefile Tue Apr 7 19:30:54 2015 (r281222) +++ head/lib/libcompiler_rt/Makefile Tue Apr 7 19:31:29 2015 (r281223) @@ -78,6 +78,7 @@ SRCF= absvdi2 \ fixxfti \ floatdidf \ floatdisf \ + floatditf \ floatdixf \ floatsitf \ floattidf \ @@ -85,6 +86,7 @@ SRCF= absvdi2 \ floattixf \ floatundidf \ floatundisf \ + floatunditf \ floatundixf \ floatunsidf \ floatunsisf \ _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
