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

   1 //===-- floatsisfvfp.S - Implement floatsisfvfp ---------------------------===//
   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 float __floatsisfvfp(int a);
  14 //
  15 // Converts single precision float to a 32-bit int rounding towards zero.
  16 // Uses Darwin calling convention where a single precision result is
  17 // return in a GPR..
  18 //
  19         .syntax unified
  20         .p2align 2
  21 DEFINE_COMPILERRT_FUNCTION(__floatsisfvfp)
  22         vmov    s15, r0        // move int to float register s15
  23         vcvt.f32.s32 s15, s15  // convert 32-bit int in s15 to float in s15
  24         vmov    r0, s15        // move s15 to result register
  25         bx      lr
  26 END_COMPILERRT_FUNCTION(__floatsisfvfp)