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* [gcc r10-11265] Fortran: simplification of NEAREST for large argument [PR109186]
@ 2023-03-24 18:44 Harald Anlauf
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From: Harald Anlauf @ 2023-03-24 18:44 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:b9f6e7e234bab6ef8b5425c3e8b88bf8dfbc5089
commit r10-11265-gb9f6e7e234bab6ef8b5425c3e8b88bf8dfbc5089
Author: Harald Anlauf <anlauf@gmx.de>
Date: Sun Mar 19 21:29:46 2023 +0100
Fortran: simplification of NEAREST for large argument [PR109186]
gcc/fortran/ChangeLog:
PR fortran/109186
* simplify.c (gfc_simplify_nearest): Fix off-by-one error in setting
up real kind-specific maximum exponent for mpfr.
gcc/testsuite/ChangeLog:
PR fortran/109186
* gfortran.dg/nearest_6.f90: New test.
(cherry picked from commit 4410a08b80cc40342eeaa5b6af824cd4352b218c)
Diff:
---
gcc/fortran/simplify.c | 2 +-
gcc/testsuite/gfortran.dg/nearest_6.f90 | 26 ++++++++++++++++++++++++++
2 files changed, 27 insertions(+), 1 deletion(-)
diff --git a/gcc/fortran/simplify.c b/gcc/fortran/simplify.c
index fe4fee897f0..2cac5a4e168 100644
--- a/gcc/fortran/simplify.c
+++ b/gcc/fortran/simplify.c
@@ -5958,7 +5958,7 @@ gfc_simplify_nearest (gfc_expr *x, gfc_expr *s)
kind = gfc_validate_kind (BT_REAL, x->ts.kind, 0);
mpfr_set_emin ((mpfr_exp_t) gfc_real_kinds[kind].min_exponent -
mpfr_get_prec(result->value.real) + 1);
- mpfr_set_emax ((mpfr_exp_t) gfc_real_kinds[kind].max_exponent - 1);
+ mpfr_set_emax ((mpfr_exp_t) gfc_real_kinds[kind].max_exponent);
mpfr_check_range (result->value.real, 0, MPFR_RNDU);
if (mpfr_sgn (s->value.real) > 0)
diff --git a/gcc/testsuite/gfortran.dg/nearest_6.f90 b/gcc/testsuite/gfortran.dg/nearest_6.f90
new file mode 100644
index 00000000000..00d1ebe618c
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/nearest_6.f90
@@ -0,0 +1,26 @@
+! { dg-do run }
+! PR fortran/109186 - Verify that NEAREST produces same results at
+! compile-time and run-time for corner cases
+! Reported by John Harper
+
+program p
+ implicit none
+ integer, parameter :: sp = selected_real_kind (6)
+ integer, parameter :: dp = selected_real_kind (13)
+ real(sp), parameter :: x1 = huge (1._sp), t1 = tiny (1._sp)
+ real(dp), parameter :: x2 = huge (1._dp), t2 = tiny (1._dp)
+ real(sp), volatile :: y1, z1
+ real(dp), volatile :: y2, z2
+ y1 = x1
+ z1 = nearest (y1, -1._sp)
+ if (nearest (x1, -1._sp) /= z1) stop 1
+ y2 = x2
+ z2 = nearest (y2, -1._dp)
+ if (nearest (x2, -1._dp) /= z2) stop 2
+ y1 = t1
+ z1 = nearest (y1, 1._sp)
+ if (nearest (t1, 1._sp) /= z1) stop 3
+ y2 = t2
+ z2 = nearest (y2, 1._dp)
+ if (nearest (t2, 1._dp) /= z2) stop 4
+end
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