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

   1 //===-- floatunssidfvfp.S - Implement floatunssidfvfp ---------------------===//
   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 __floatunssidfvfp(unsigned int a);
  14 //
  15 // Converts a 32-bit int to a double precision float.
  16 // Uses Darwin calling convention where a double precision result is
  17 // return in GPR register pair.
  18 //
  19         .syntax unified
  20         .p2align 2
  21 DEFINE_COMPILERRT_FUNCTION(__floatunssidfvfp)
  22 #if defined(COMPILER_RT_ARMHF_TARGET)
  23         vmov s0, r0
  24         vcvt.f64.u32 d0, s0
  25 #else
  26         vmov    s15, r0        // move int to float register s15
  27         vcvt.f64.u32 d7, s15   // convert 32-bit int in s15 to double in d7
  28         vmov    r0, r1, d7     // move d7 to result register pair r0/r1
  29 #endif
  30         bx      lr
  31 END_COMPILERRT_FUNCTION(__floatunssidfvfp)
  32
  33 NO_EXEC_STACK_DIRECTIVE
  34