1//===-- nedf2vfp.S - Implement nedf2vfp -----------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "../assembly.h"
10
11// extern double __nedf2vfp(double a, double b);
12//
13// Returns zero if a and b are unequal and neither is NaN.
14// Uses Darwin calling convention where double precision arguments are passsed
15// like in GPR pairs.
16
17 .syntax unified
18 .p2align 2
19DEFINE_COMPILERRT_FUNCTION(__nedf2vfp)
20#if defined(COMPILER_RT_ARMHF_TARGET)
21 vcmp.f64 d0, d1
22#else
23 vmov d6, r0, r1 // load r0/r1 pair in double register
24 vmov d7, r2, r3 // load r2/r3 pair in double register
25 vcmp.f64 d6, d7
26#endif
27 vmrs apsr_nzcv, fpscr
28 ITE(ne)
29 movne r0, #1 // set result register to 0 if unequal
30 moveq r0, #0
31 bx lr
32END_COMPILERRT_FUNCTION(__nedf2vfp)
33
34NO_EXEC_STACK_DIRECTIVE
35
36

source code of compiler-rt/lib/builtins/arm/nedf2vfp.S