compiler-rt/lib/builtins/x86_64/floatundisf.S

   1 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   2 // See https://llvm.org/LICENSE.txt for license information.
   3 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   4
   5 #include "../assembly.h"
   6
   7 // float __floatundisf(du_int a);
   8
   9 #ifdef __x86_64__
  10
  11 CONST_SECTION
  12
  13         .balign 16
  14 two:
  15         .single 2.0
  16
  17 #define REL_ADDR(_a)    (_a)(%rip)
  18
  19 .text
  20 .balign 4
  21 DEFINE_COMPILERRT_FUNCTION(__floatundisf)
  22         movq            $1,                     %rsi
  23         testq           %rdi,           %rdi
  24         js                      1f
  25         cvtsi2ssq       %rdi,           %xmm0
  26         ret
  27
  28 1:      andq            %rdi,           %rsi
  29         shrq            %rdi
  30         orq                     %rsi,           %rdi
  31         cvtsi2ssq       %rdi,           %xmm0
  32         mulss   REL_ADDR(two),  %xmm0
  33         ret
  34 END_COMPILERRT_FUNCTION(__floatundisf)
  35
  36 #endif // __x86_64__
  37
  38 NO_EXEC_STACK_DIRECTIVE
  39