TheRock/compiler/amd-llvm/libclc/clc/lib/generic/math/clc_nextdown.inc

//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

_CLC_OVERLOAD _CLC_CONST _CLC_DEF __CLC_GENTYPE
__clc_nextdown(__CLC_GENTYPE x) {
  __CLC_S_GENTYPE increment =
      x > __CLC_FP_LIT(0.0) ? (__CLC_S_GENTYPE)-1 : (__CLC_S_GENTYPE)1;
  __CLC_S_GENTYPE ix = __CLC_AS_S_GENTYPE(x) + increment;

  __CLC_GENTYPE min_value = __CLC_GENTYPE_DENORMS_ARE_ZERO
                                ? -__CLC_GENTYPE_MIN
                                : -__CLC_GENTYPE_TRUE_MIN;
  __CLC_GENTYPE y = x == __CLC_FP_LIT(0.0) ? min_value : __CLC_AS_GENTYPE(ix);
  return __clc_isnan(x) || x == -__CLC_GENTYPE_INF ? x : y;
}