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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/113155] large overhead for cast float to uint64_t. Arm
 cortex-m4 (ARMv7E-M, fpv4-sp-d16, ieee 754). Compiler: arm-none-eabi-gcc
Date: Wed, 27 Dec 2023 07:23:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113155

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I looked into the sources of libgcc, __aeabi_f2ulz is defined as __fixunssf=
di
which is defined in soft-fp/fixunssfdi.c and that does:
```
UDItype
__fixunssfdi (SFtype a)
{
  FP_DECL_EX;
  FP_DECL_S (A);
  UDItype r;

  FP_INIT_EXCEPTIONS;
  FP_UNPACK_RAW_S (A, a);
  FP_TO_INT_S (r, A, DI_BITS, 0);
  FP_HANDLE_EXCEPTIONS;

  return r;
}
```

FP_TO_INT_S is defined to _FP_TO_INT which basically does what you want exc=
ept
it can handle FP exceptions.=