src/compiler-rt/lib/builtins/arm/subsf3vfp.S

   1 //===-- subsf3vfp.S - Implement subsf3vfp ---------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is dual licensed under the MIT and the University of Illinois Open
   6 // Source Licenses. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "../assembly.h"
  11
  12 //
  13 // extern float __subsf3vfp(float a, float b);
  14 //
  15 // Returns the difference between two single precision floating point numbers
  16 // using the Darwin calling convention where single arguments are passsed
  17 // like 32-bit ints.
  18 //
  19         .syntax unified
  20         .align 2
  21 DEFINE_COMPILERRT_FUNCTION(__subsf3vfp)
  22         vmov    s14, r0         // move first param from r0 into float register
  23         vmov    s15, r1         // move second param from r1 into float register
  24         vsub.f32 s14, s14, s15
  25         vmov    r0, s14         // move result back to r0
  26         bx      lr
  27 END_COMPILERRT_FUNCTION(__subsf3vfp)