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DD.h
(1.12 KB)
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divtc3.c
(3.23 KB)
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fixtfdi.c
(3.29 KB)
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fixtfti.c
(1.32 KB)
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fixunstfdi.c
(1.94 KB)
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fixunstfti.c
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floatditf.c
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floattitf.c
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floatunditf.c
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gcc_qadd.c
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gcc_qdiv.c
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gcc_qmul.c
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gcc_qsub.c
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multc3.c
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restFP.S
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saveFP.S
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Editing: floattitf.c
//===-- lib/builtins/ppc/floattitf.c - Convert int128->long double -*-C -*-===// // // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. // See https://llvm.org/LICENSE.txt for license information. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // //===----------------------------------------------------------------------===// // // This file implements converting a signed 128 bit integer to a 128bit IBM / // PowerPC long double (double-double) value. // //===----------------------------------------------------------------------===// #include <stdint.h> // Conversions from signed and unsigned 64-bit int to long double. long double __floatditf(int64_t); long double __floatunditf(uint64_t); // Convert a signed 128-bit integer to long double. // This uses the following property: Let hi and lo be 64-bits each, // and let signed_val_k() and unsigned_val_k() be the value of the // argument interpreted as a signed or unsigned k-bit integer. Then, // // signed_val_128(hi,lo) = signed_val_64(hi) * 2^64 + unsigned_val_64(lo) // = (long double)hi * 2^64 + (long double)lo, // // where (long double)hi and (long double)lo are signed and // unsigned 64-bit integer to long double conversions, respectively. long double __floattitf(__int128_t arg) { // Split the int128 argument into 64-bit high and low int64 parts. int64_t ArgHiPart = (int64_t)(arg >> 64); uint64_t ArgLoPart = (uint64_t)arg; // Convert each 64-bit part into long double. The high part // must be a signed conversion and the low part an unsigned conversion // to ensure the correct result. long double ConvertedHiPart = __floatditf(ArgHiPart); long double ConvertedLoPart = __floatunditf(ArgLoPart); // The low bit of ArgHiPart corresponds to the 2^64 bit in arg. // Multiply the high part by 2^64 to undo the right shift by 64-bits // done in the splitting. Then, add to the low part to obtain the // final result. return ((ConvertedHiPart * 0x1.0p64) + ConvertedLoPart); }
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