src/compiler-rt/lib/builtins/arm/muldf3vfp.S

   1 //===-- muldf3vfp.S - Implement muldf3vfp ---------------------------------===//
   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 __muldf3vfp(double a, double b);
  14 //
  15 // Multiplies two double precision floating point numbers using the Darwin
  16 // calling convention where double arguments are passsed in GPR pairs
  17 //
  18         .syntax unified
  19         .p2align 2
  20 DEFINE_COMPILERRT_FUNCTION(__muldf3vfp)
  21 #if defined(COMPILER_RT_ARMHF_TARGET)
  22         vmul.f64 d0, d0, d1
  23 #else
  24         vmov    d6, r0, r1         // move first param from r0/r1 pair into d6
  25         vmov    d7, r2, r3         // move second param from r2/r3 pair into d7
  26         vmul.f64 d6, d6, d7
  27         vmov    r0, r1, d6         // move result back to r0/r1 pair
  28 #endif
  29         bx      lr
  30 END_COMPILERRT_FUNCTION(__muldf3vfp)
  31
  32 NO_EXEC_STACK_DIRECTIVE
  33