From: Harald Anlauf <anlauf@gmx.de>
Date: Thu, 1 Apr 2021 05:49:32 +0000 (+0200)
Subject: PR fortran/99840 - ICE in gfc_simplify_matmul, at fortran/simplify.c:4777
X-Git-Tag: basepoints/gcc-12~314
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d7cef070bf43bfb3f3d77bac42eadea06c4b0281;p=thirdparty%2Fgcc.git

PR fortran/99840 - ICE in gfc_simplify_matmul, at fortran/simplify.c:4777

The simplification of the transposition of a constant array shall properly
initialize and set the shape of the result.

gcc/fortran/ChangeLog:

	PR fortran/99840
	* simplify.c (gfc_simplify_transpose): Properly initialize
	resulting shape.

gcc/testsuite/ChangeLog:

	PR fortran/99840
	* gfortran.dg/transpose_5.f90: New test.
---

diff --git a/gcc/fortran/simplify.c b/gcc/fortran/simplify.c
index 388aca7c38cc..c27b47aa98fd 100644
--- a/gcc/fortran/simplify.c
+++ b/gcc/fortran/simplify.c
@@ -8123,8 +8123,8 @@ gfc_simplify_transpose (gfc_expr *matrix)
 			       &matrix->where);
   result->rank = 2;
   result->shape = gfc_get_shape (result->rank);
-  mpz_set (result->shape[0], matrix->shape[1]);
-  mpz_set (result->shape[1], matrix->shape[0]);
+  mpz_init_set (result->shape[0], matrix->shape[1]);
+  mpz_init_set (result->shape[1], matrix->shape[0]);
 
   if (matrix->ts.type == BT_CHARACTER)
     result->ts.u.cl = matrix->ts.u.cl;
diff --git a/gcc/testsuite/gfortran.dg/transpose_5.f90 b/gcc/testsuite/gfortran.dg/transpose_5.f90
new file mode 100644
index 000000000000..ed4b643acbf6
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/transpose_5.f90
@@ -0,0 +1,8 @@
+! { dg-do compile }
+! { dg-options "-O2" }
+! PR fortran/99840 - ICE in gfc_simplify_matmul, at fortran/simplify.c:4777
+program p
+  integer, parameter :: x(0,0) = 0
+  integer :: y(0,0)
+  y = matmul (x, transpose(x))
+end