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

   1 //===-- fixunsdfsivfp.S - Implement fixunsdfsivfp -------------------------===//
   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 unsigned int __fixunsdfsivfp(double a);
  14 //
  15 // Converts double precision float to a 32-bit unsigned int rounding towards
  16 // zero. All negative values become zero.
  17 // Uses Darwin calling convention where a double precision parameter is
  18 // passed in GPR register pair.
  19 //
  20         .syntax unified
  21         .p2align 2
  22 DEFINE_COMPILERRT_FUNCTION(__fixunsdfsivfp)
  23         vmov    d7, r0, r1    // load double register from R0/R1
  24         vcvt.u32.f64 s15, d7  // convert double to 32-bit int into s15
  25         vmov    r0, s15       // move s15 to result register
  26         bx      lr
  27 END_COMPILERRT_FUNCTION(__fixunsdfsivfp)