src/compiler-rt/lib/builtins/arm/unordsf2vfp.S

   1 //===-- unordsf2vfp.S - Implement unordsf2vfp -----------------------------===//
   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 __unordsf2vfp(float a, float b);
  14 //
  15 // Returns one iff a or b is NaN
  16 // Uses Darwin calling convention where single precision arguments are passsed
  17 // like 32-bit ints
  18 //
  19         .syntax unified
  20         .p2align 2
  21 DEFINE_COMPILERRT_FUNCTION(__unordsf2vfp)
  22 #if defined(COMPILER_RT_ARMHF_TARGET)
  23         vcmp.f32 s0, s1
  24 #else
  25         vmov    s14, r0     // move from GPR 0 to float register
  26         vmov    s15, r1     // move from GPR 1 to float register
  27         vcmp.f32 s14, s15
  28 #endif
  29         vmrs    apsr_nzcv, fpscr
  30         movvs   r0, #1      // set result register to 1 if "overflow" (any NaNs)
  31         movvc   r0, #0
  32         bx      lr
  33 END_COMPILERRT_FUNCTION(__unordsf2vfp)
  34
  35 NO_EXEC_STACK_DIRECTIVE
  36