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Summary: Currently CMake doesn't build builtins for AArch64 and if one does this anyway it's likely that at least `__multc3`, `__floatditf` and `__floatunditf` will be missing. There is actually more builtins to add, but these come from different libc implementations, thus providing them makes compiler-rt for AArch64 good enough at least for basic usage. Builtins implementation were originally taken from FreeBSD project: * [[ https://reviews.freebsd.org/D2173 | __multc3 ]] * [[ https://reviews.freebsd.org/D2174 | __floatditf and __floatunditf ]] Until they have been tested to find mistakes in `__float*` functions. `__floatditf` was based on `__floatsitf`, which had the same mistakes (fixed it in r243746). Version of the builtins in this patch are fixed and complemented with basic tests. Additionally they were tested via GCC's torture (this is what revealed these issues). P.S. Ed (author of FreeBSD patches) asked for feedback on the list some time ago (here [[ http://lists.cs.uiuc.edu/pipermail/llvmdev/2015-March/084064.html | here ]]) and got no response, but it seems to be worth adding these builtins as is and extracting common part later. Reviewers: howard.hinnant, t.p.northover, jmolloy, enefaim, rengolin, zatrazz Subscribers: asl, emaste, samsonov, aemerson, llvm-commits, rengolin Differential Revision: http://reviews.llvm.org/D11679 llvm-svn: 245296
51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
//===-- lib/floatditf.c - integer -> quad-precision conversion ----*- C -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements di_int to quad-precision conversion for the
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// compiler-rt library in the IEEE-754 default round-to-nearest, ties-to-even
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// mode.
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//
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//===----------------------------------------------------------------------===//
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#define QUAD_PRECISION
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#include "fp_lib.h"
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#if defined(CRT_HAS_128BIT) && defined(CRT_LDBL_128BIT)
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COMPILER_RT_ABI fp_t __floatditf(di_int a) {
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const int aWidth = sizeof a * CHAR_BIT;
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// Handle zero as a special case to protect clz
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if (a == 0)
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return fromRep(0);
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// All other cases begin by extracting the sign and absolute value of a
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rep_t sign = 0;
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du_int aAbs = (du_int)a;
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if (a < 0) {
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sign = signBit;
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aAbs = ~(du_int)a + 1U;
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}
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// Exponent of (fp_t)a is the width of abs(a).
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const int exponent = (aWidth - 1) - __builtin_clzll(aAbs);
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rep_t result;
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// Shift a into the significand field, rounding if it is a right-shift
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const int shift = significandBits - exponent;
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result = (rep_t)aAbs << shift ^ implicitBit;
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// Insert the exponent
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result += (rep_t)(exponent + exponentBias) << significandBits;
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// Insert the sign bit and return
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return fromRep(result | sign);
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}
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#endif
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