0d586d06a7
r303188 removed all the uses of aliases for EABI functions from compiler-rt, because some of them had mismatched calling conventions. Obviously, we can't use aliases for functions which don't have the same calling convention, but that's only an issue for floating-point functions with the hardfloat ABI. In other cases, the stubs increase size and reduce performance for no benefit. This patch adds back the aliases, with appropriate checks to make sure they're only used in cases where the calling convention matches. llvm-svn: 314851
62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
//===-- lib/floatsidf.c - integer -> double-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 integer to double-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 DOUBLE_PRECISION
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#include "fp_lib.h"
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#include "int_lib.h"
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COMPILER_RT_ABI fp_t
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__floatsidf(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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if (a < 0) {
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sign = signBit;
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a = -a;
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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_clz(a);
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rep_t result;
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// Shift a into the significand field and clear the implicit bit. Extra
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// cast to unsigned int is necessary to get the correct behavior for
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// the input INT_MIN.
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const int shift = significandBits - exponent;
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result = (rep_t)(unsigned int)a << 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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#if defined(__ARM_EABI__)
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#if defined(COMPILER_RT_ARMHF_TARGET)
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AEABI_RTABI fp_t __aeabi_i2d(int a) {
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return __floatsidf(a);
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}
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#else
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AEABI_RTABI fp_t __aeabi_i2d(int a) COMPILER_RT_ALIAS(__floatsidf);
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#endif
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#endif
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