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From: "luoxhu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/102860] [12 regression] libgomp.fortran/simd2.f90
 ICEs after r12-4526
Date: Wed, 15 Dec 2021 07:24:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102860

--- Comment #6 from luoxhu at gcc dot gnu.org ---
Fortran's modulo is floor_mod as documented here:
https://gcc.gnu.org/onlinedocs/gfortran/MODULO.html?

Syntax:
RESULT =3D MODULO(A, P)

Return value:
The type and kind of the result are those of the arguments. (As a GNU
extension, kind is the largest kind of the actual arguments.)

If A and P are of type INTEGER:
MODULO(A,P) has the value R such that A=3DQ*P+R, where Q is an integer and =
R is
between 0 (inclusive) and P (exclusive).

If A and P are of type REAL:
MODULO(A,P) has the value of A - FLOOR (A / P) * P.

The returned value has the same sign as P and a magnitude less than the
magnitude of P.


program test_modulo
  print *, modulo(17,3)
  print *, modulo(17.5,5.5)

  print *, modulo(-17,3)
  print *, modulo(-17.5,5.5)

  print *, modulo(17,-3)
  print *, modulo(17.5,-5.5)
end program


LD_LIBRARY_PATH=3D./x86_64-pc-linux-gnu/libgfortran/.libs/ ./a.out

           2
   1.00000000
           1
   4.50000000
          -1
  -4.50000000=