public inbox for gcc-cvs@sourceware.org
help / color / mirror / Atom feed
* [gcc r13-4394] Fortran: intrinsic MERGE shall use all its arguments [PR107874]
@ 2022-11-29 18:19 Harald Anlauf
0 siblings, 0 replies; only message in thread
From: Harald Anlauf @ 2022-11-29 18:19 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:3832c6f7e672e76bba74a508bf3a49740ea38046
commit r13-4394-g3832c6f7e672e76bba74a508bf3a49740ea38046
Author: Harald Anlauf <anlauf@gmx.de>
Date: Mon Nov 28 20:43:02 2022 +0100
Fortran: intrinsic MERGE shall use all its arguments [PR107874]
gcc/fortran/ChangeLog:
PR fortran/107874
* simplify.cc (gfc_simplify_merge): When simplifying MERGE with a
constant scalar MASK, ensure that arguments TSOURCE and FSOURCE are
either constant or will be evaluated.
* trans-intrinsic.cc (gfc_conv_intrinsic_merge): Evaluate arguments
before generating conditional expression.
gcc/testsuite/ChangeLog:
PR fortran/107874
* gfortran.dg/merge_init_expr_2.f90: Adjust code to the corrected
simplification.
* gfortran.dg/merge_1.f90: New test.
Co-authored-by: Steven G. Kargl <kargl@gcc.gnu.org>
Diff:
---
gcc/fortran/simplify.cc | 17 ++++++++-
gcc/fortran/trans-intrinsic.cc | 3 ++
gcc/testsuite/gfortran.dg/merge_1.f90 | 49 +++++++++++++++++++++++++
gcc/testsuite/gfortran.dg/merge_init_expr_2.f90 | 3 +-
4 files changed, 70 insertions(+), 2 deletions(-)
diff --git a/gcc/fortran/simplify.cc b/gcc/fortran/simplify.cc
index 9c2fea8c5f2..b6184181f26 100644
--- a/gcc/fortran/simplify.cc
+++ b/gcc/fortran/simplify.cc
@@ -4913,7 +4913,22 @@ gfc_simplify_merge (gfc_expr *tsource, gfc_expr *fsource, gfc_expr *mask)
if (mask->expr_type == EXPR_CONSTANT)
{
- result = gfc_copy_expr (mask->value.logical ? tsource : fsource);
+ /* The standard requires evaluation of all function arguments.
+ Simplify only when the other dropped argument (FSOURCE or TSOURCE)
+ is a constant expression. */
+ if (mask->value.logical)
+ {
+ if (!gfc_is_constant_expr (fsource))
+ return NULL;
+ result = gfc_copy_expr (tsource);
+ }
+ else
+ {
+ if (!gfc_is_constant_expr (tsource))
+ return NULL;
+ result = gfc_copy_expr (fsource);
+ }
+
/* Parenthesis is needed to get lower bounds of 1. */
result = gfc_get_parentheses (result);
gfc_simplify_expr (result, 1);
diff --git a/gcc/fortran/trans-intrinsic.cc b/gcc/fortran/trans-intrinsic.cc
index bb938026828..93426981bac 100644
--- a/gcc/fortran/trans-intrinsic.cc
+++ b/gcc/fortran/trans-intrinsic.cc
@@ -7557,6 +7557,9 @@ gfc_conv_intrinsic_merge (gfc_se * se, gfc_expr * expr)
&se->pre);
se->string_length = len;
}
+ tsource = gfc_evaluate_now (tsource, &se->pre);
+ fsource = gfc_evaluate_now (fsource, &se->pre);
+ mask = gfc_evaluate_now (mask, &se->pre);
type = TREE_TYPE (tsource);
se->expr = fold_build3_loc (input_location, COND_EXPR, type, mask, tsource,
fold_convert (type, fsource));
diff --git a/gcc/testsuite/gfortran.dg/merge_1.f90 b/gcc/testsuite/gfortran.dg/merge_1.f90
new file mode 100644
index 00000000000..abbc2276b1c
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/merge_1.f90
@@ -0,0 +1,49 @@
+! { dg-do run }
+! PR fortran/107874 - merge not using all its arguments
+! Contributed by John Harper
+
+program testmerge9
+ implicit none
+ integer :: i
+ logical :: x(2) = (/.true., .false./)
+ logical :: called(2)
+
+ ! At run-time all arguments shall be evaluated
+ do i = 1,2
+ called = .false.
+ print *, merge (tstuff(), fstuff(), x(i))
+ if (any (.not. called)) stop 1
+ end do
+
+ ! Compile-time simplification shall not drop non-constant args
+ called = .false.
+ print *, merge (tstuff(),fstuff(),.true.)
+ if (any (.not. called)) stop 2
+ called = .false.
+ print *, merge (tstuff(),fstuff(),.false.)
+ if (any (.not. called)) stop 3
+ called = .false.
+ print *, merge (tstuff(),.false.,.true.)
+ if (any (called .neqv. [.true.,.false.])) stop 4
+ called = .false.
+ print *, merge (tstuff(),.false.,.false.)
+ if (any (called .neqv. [.true.,.false.])) stop 5
+ called = .false.
+ print *, merge (.true.,fstuff(),.true.)
+ if (any (called .neqv. [.false.,.true.])) stop 6
+ called = .false.
+ print *, merge (.true.,fstuff(),.false.)
+ if (any (called .neqv. [.false.,.true.])) stop 7
+contains
+ logical function tstuff()
+ print *,'tstuff'
+ tstuff = .true.
+ called(1) = .true.
+ end function tstuff
+
+ logical function fstuff()
+ print *,'fstuff'
+ fstuff = .false.
+ called(2) = .true.
+ end function fstuff
+end program testmerge9
diff --git a/gcc/testsuite/gfortran.dg/merge_init_expr_2.f90 b/gcc/testsuite/gfortran.dg/merge_init_expr_2.f90
index c761a47cccb..f4a83801137 100644
--- a/gcc/testsuite/gfortran.dg/merge_init_expr_2.f90
+++ b/gcc/testsuite/gfortran.dg/merge_init_expr_2.f90
@@ -48,7 +48,8 @@ end module m2
subroutine test
- character(len=3) :: one, two, three
+ character(len=3) :: one, three
+ character(len=3), parameter :: two = "def"
logical, parameter :: true = .true.
three = merge (one, two, true)
end subroutine test
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2022-11-29 18:19 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-11-29 18:19 [gcc r13-4394] Fortran: intrinsic MERGE shall use all its arguments [PR107874] Harald Anlauf
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).