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d2ce3e9621
GCC provides these functions (e.g. __addtf3, etc.) in libgcc on x86_64. Since Clang supports float128, we can also enable the existing code by using float128 for fp_t if either __FLOAT128__ or __SIZEOF_FLOAT128__ is defined instead of only supporting these builtins for platforms with 128-bit IEEE long doubles. This commit defines a new tf_float typedef that matches a float with attribute((mode(TF)) on each given architecture. There are more tests that could be enabled for x86, but to keep the diff smaller, I restricted test changes to ones that started failing as part of this refactoring. This change has been tested on x86 (natively) and aarch64,powerpc64,riscv64 and sparc64 via qemu-user. This supersedes https://reviews.llvm.org/D98261 and should also cover the changes from https://github.com/llvm/llvm-project/pull/68041.
83 lines
1.8 KiB
C
83 lines
1.8 KiB
C
//===-- int_to_fp.h - integer to floating point conversion ----------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Set source and destination defines in order to use a correctly
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// parameterised floatXiYf implementation.
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//
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//===----------------------------------------------------------------------===//
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#ifndef INT_TO_FP_H
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#define INT_TO_FP_H
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#include "int_lib.h"
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#if defined SRC_I64
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typedef int64_t src_t;
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typedef uint64_t usrc_t;
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static __inline int clzSrcT(usrc_t x) { return __builtin_clzll(x); }
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#elif defined SRC_U64
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typedef uint64_t src_t;
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typedef uint64_t usrc_t;
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static __inline int clzSrcT(usrc_t x) { return __builtin_clzll(x); }
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#elif defined SRC_I128
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typedef __int128_t src_t;
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typedef __uint128_t usrc_t;
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static __inline int clzSrcT(usrc_t x) { return __clzti2(x); }
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#elif defined SRC_U128
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typedef __uint128_t src_t;
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typedef __uint128_t usrc_t;
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static __inline int clzSrcT(usrc_t x) { return __clzti2(x); }
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#else
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#error Source should be a handled integer type.
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#endif
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#if defined DST_SINGLE
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typedef float dst_t;
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typedef uint32_t dst_rep_t;
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#define DST_REP_C UINT32_C
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enum {
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dstSigBits = 23,
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};
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#elif defined DST_DOUBLE
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typedef double dst_t;
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typedef uint64_t dst_rep_t;
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#define DST_REP_C UINT64_C
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enum {
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dstSigBits = 52,
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};
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#elif defined DST_QUAD
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typedef tf_float dst_t;
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typedef __uint128_t dst_rep_t;
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#define DST_REP_C (__uint128_t)
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enum {
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dstSigBits = 112,
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};
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#else
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#error Destination should be a handled floating point type
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#endif
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static __inline dst_t dstFromRep(dst_rep_t x) {
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const union {
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dst_t f;
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dst_rep_t i;
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} rep = {.i = x};
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return rep.f;
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}
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#endif // INT_TO_FP_H
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