compiler-rt/lib/builtins/arm/aeabi_dcmp.S

   1 //===-- aeabi_dcmp.S - EABI dcmp* implementation ---------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "../assembly.h"
  10
  11 // int __aeabi_dcmp{eq,lt,le,ge,gt}(double a, double b) {
  12 //   int result = __{eq,lt,le,ge,gt}df2(a, b);
  13 //   if (result {==,<,<=,>=,>} 0) {
  14 //     return 1;
  15 //   } else {
  16 //     return 0;
  17 //   }
  18 // }
  19
  20 #if defined(COMPILER_RT_ARMHF_TARGET)
  21 #  define CONVERT_DCMP_ARGS_TO_DF2_ARGS                    \
  22         vmov      d0, r0, r1                     SEPARATOR \
  23         vmov      d1, r2, r3
  24 #else
  25 #  define CONVERT_DCMP_ARGS_TO_DF2_ARGS
  26 #endif
  27
  28 #define DEFINE_AEABI_DCMP(cond)                            \
  29         .syntax unified                          SEPARATOR \
  30         .p2align 2                               SEPARATOR \
  31 DEFINE_COMPILERRT_FUNCTION(__aeabi_dcmp ## cond)           \
  32         push      { r4, lr }                     SEPARATOR \
  33         CONVERT_DCMP_ARGS_TO_DF2_ARGS            SEPARATOR \
  34         bl        SYMBOL_NAME(__ ## cond ## df2) SEPARATOR \
  35         cmp       r0, #0                         SEPARATOR \
  36         b ## cond 1f                             SEPARATOR \
  37         movs      r0, #0                         SEPARATOR \
  38         pop       { r4, pc }                     SEPARATOR \
  39 1:                                               SEPARATOR \
  40         movs      r0, #1                         SEPARATOR \
  41         pop       { r4, pc }                     SEPARATOR \
  42 END_COMPILERRT_FUNCTION(__aeabi_dcmp ## cond)
  43
  44 DEFINE_AEABI_DCMP(eq)
  45 DEFINE_AEABI_DCMP(lt)
  46 DEFINE_AEABI_DCMP(le)
  47 DEFINE_AEABI_DCMP(ge)
  48 DEFINE_AEABI_DCMP(gt)
  49
  50 NO_EXEC_STACK_DIRECTIVE
  51