contrib/llvm-project/compiler-rt/lib/builtins/i386/floatundixf.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 // long double __floatundixf(du_int a);16
   8
   9 #ifdef __i386__
  10
  11 CONST_SECTION
  12
  13         .balign 16
  14 twop52:
  15         .quad 0x4330000000000000
  16
  17         .balign 16
  18 twop84_plus_twop52_neg:
  19         .quad 0xc530000000100000
  20
  21         .balign 16
  22 twop84:
  23         .quad 0x4530000000000000
  24
  25 #define REL_ADDR(_a)    (_a)-0b(%eax)
  26
  27 .text
  28 .balign 4
  29 DEFINE_COMPILERRT_FUNCTION(__floatundixf)
  30         calll   0f
  31 0:      popl    %eax
  32         movss   8(%esp),                        %xmm0   // hi 32 bits of input
  33         movss   4(%esp),                        %xmm1   // lo 32 bits of input
  34         orpd    REL_ADDR(twop84),       %xmm0   // 2^84 + hi (as a double)
  35         orpd    REL_ADDR(twop52),       %xmm1   // 2^52 + lo (as a double)
  36         addsd   REL_ADDR(twop84_plus_twop52_neg),       %xmm0   // hi - 2^52 (no rounding occurs)
  37         movsd   %xmm1,                          4(%esp)
  38         fldl    4(%esp)
  39         movsd   %xmm0,                          4(%esp)
  40         faddl   4(%esp)
  41         ret
  42 END_COMPILERRT_FUNCTION(__floatundixf)
  43
  44 #endif // __i386__
  45
  46 NO_EXEC_STACK_DIRECTIVE
  47