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Currently the *tf builtin functions can only be built if long double is an IEEE float, which prevents them from being available e.g. for x86 targets (unlike libgcc which has them). This non-functional change prepares the builtins library *tf functions for being able to target x86 by decoupling their presence from CRT_LDBL_128BIT and instead checking for a CRT_HAS_TF_MODE macro. This change is NFC since the CRT_HAS_TF_MODE is currently only set if long double is an IEEE 128-bit float. Reviewed By: compnerd Differential Revision: https://reviews.llvm.org/D153812
25 lines
798 B
C
25 lines
798 B
C
//===-- lib/subtf3.c - Quad-precision subtraction -----------------*- C -*-===//
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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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// This file implements quad-precision soft-float subtraction.
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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_TF_MODE)
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COMPILER_RT_ABI fp_t __addtf3(fp_t a, fp_t b);
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// Subtraction; flip the sign bit of b and add.
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COMPILER_RT_ABI fp_t __subtf3(fp_t a, fp_t b) {
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return __addtf3(a, fromRep(toRep(b) ^ signBit));
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}
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#endif
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