1//===-- gtdf2vfp.S - Implement gtdf2vfp -----------------------------------===//
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//
12// extern double __gtdf2vfp(double a, double b);
13//
14// Returns one iff a > b and neither is NaN.
15// Uses Darwin calling convention where double precision arguments are passsed
16// like in GPR pairs.
17//
18 .syntax unified
19 .p2align 2
20DEFINE_COMPILERRT_FUNCTION(__gtdf2vfp)
21#if defined(COMPILER_RT_ARMHF_TARGET)
22 vcmp.f64 d0, d1
23#else
24 vmov d6, r0, r1 // load r0/r1 pair in double register
25 vmov d7, r2, r3 // load r2/r3 pair in double register
26 vcmp.f64 d6, d7
27#endif
28 vmrs apsr_nzcv, fpscr
29 ITE(gt)
30 movgt r0, #1 // set result register to 1 if equal
31 movle r0, #0
32 bx lr
33END_COMPILERRT_FUNCTION(__gtdf2vfp)
34
35NO_EXEC_STACK_DIRECTIVE
36
37

source code of compiler-rt/lib/builtins/arm/gtdf2vfp.S