//===-- cmpdf2.S - double-precision floating point comparison -------------===//
//
// 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 function has the semantics of GNU __cmpdf2: it's a three-way compare
// which returns <0 if x<y, 0 if x==y, and >0 if x>y. If the result is
// unordered (i.e. x or y or both is NaN) then it returns >0.
//
// This also makes it suitable for use as all of __eqdf2, __nedf2, __ltdf2 or
// __ledf2.
//
//===----------------------------------------------------------------------===//

#include "../../assembly.h"
#include "../crt_endian.h"

  .syntax unified
  .text
  .p2align 2

op0h .req xh
op0l .req xl
op1h .req yh
op1l .req yl
.macro ReturnResult
  bhi 0f
  blo 1f
  movs r0, #0
  // This macro is always called immediately before returning from the
  // function, so it's safe to use the same return instruction here, instead of
  // wasting time branching forward to the end of the macro.
  pop     {r4,r5,r6,pc}
0:
  movs r0, #1
  pop     {r4,r5,r6,pc}
1:
  movs r0, #1
  rsbs r0, r0, #0
  pop     {r4,r5,r6,pc}
.endm

DEFINE_COMPILERRT_FUNCTION_ALIAS(__cmpdf2, __compiler_rt_softfp_cmpdf2)
DEFINE_COMPILERRT_FUNCTION_ALIAS(__ledf2, __cmpdf2)
DEFINE_COMPILERRT_FUNCTION_ALIAS(__ltdf2, __cmpdf2)
DEFINE_COMPILERRT_FUNCTION_ALIAS(__eqdf2, __cmpdf2)
DEFINE_COMPILERRT_FUNCTION_ALIAS(__nedf2, __cmpdf2)

DEFINE_COMPILERRT_THUMB_FUNCTION(__compiler_rt_softfp_cmpdf2)
  #include "dcmp.h"

LOCAL_LABEL(NaN):
  movs r0, #1
  pop     {r4,r5,r6,pc}

END_COMPILERRT_FUNCTION(__compiler_rt_softfp_cmpdf2)

NO_EXEC_STACK_DIRECTIVE