src/compiler-rt/lib/builtins/arm/negdf2vfp.S

   1 //===-- negdf2vfp.S - Implement negdf2vfp ---------------------------------===//
   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 double __negdf2vfp(double a, double b);
  14 //
  15 // Returns the negation a double precision floating point numbers using the
  16 // Darwin calling convention where double arguments are passsed in GPR pairs.
  17 //
  18         .syntax unified
  19         .p2align 2
  20 DEFINE_COMPILERRT_FUNCTION(__negdf2vfp)
  21 #if defined(COMPILER_RT_ARMHF_TARGET)
  22         vneg.f64 d0, d0
  23 #else
  24         eor     r1, r1, #-2147483648    // flip sign bit on double in r0/r1 pair
  25 #endif
  26         bx      lr
  27 END_COMPILERRT_FUNCTION(__negdf2vfp)
  28
  29 NO_EXEC_STACK_DIRECTIVE
  30