src/compiler-rt/lib/builtins/arm/gedf2vfp.S

   1 //===-- gedf2vfp.S - Implement gedf2vfp -----------------------------------===//
   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 int __gedf2vfp(double a, double b);
  14 //
  15 // Returns one iff a >= b and neither is NaN.
  16 // Uses Darwin calling convention where double precision arguments are passsed
  17 // like in GPR pairs.
  18 //
  19         .syntax unified
  20         .p2align 2
  21 DEFINE_COMPILERRT_FUNCTION(__gedf2vfp)
  22 #if defined(COMPILER_RT_ARMHF_TARGET)
  23         vcmp.f64 d0, d1
  24 #else
  25         vmov    d6, r0, r1      // load r0/r1 pair in double register
  26         vmov    d7, r2, r3      // load r2/r3 pair in double register
  27         vcmp.f64 d6, d7
  28 #endif
  29         vmrs    apsr_nzcv, fpscr
  30         movge   r0, #1      // set result register to 1 if greater than or equal
  31         movlt   r0, #0
  32         bx      lr
  33 END_COMPILERRT_FUNCTION(__gedf2vfp)
  34
  35 NO_EXEC_STACK_DIRECTIVE
  36