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| author | Roger Sayle <roger@eyesopen.com> | 2006-03-03 21:47:24 +0000 |
|---|---|---|
| committer | Roger Sayle <sayle@gcc.gnu.org> | 2006-03-03 21:47:24 +0000 |
| commit | 12de6bc686b5e794c2ae69c96b54825ef43c5e3e (patch) | |
| tree | eeb28317cd038a4a128e62c468444d30c2592c81 /gcc/fortran/dependency.c | |
| parent | 0b8f2ce42dad5ee2bd3121e9cdcd522b6541b698 (diff) | |
| download | gcc-12de6bc686b5e794c2ae69c96b54825ef43c5e3e.zip gcc-12de6bc686b5e794c2ae69c96b54825ef43c5e3e.tar.gz gcc-12de6bc686b5e794c2ae69c96b54825ef43c5e3e.tar.bz2 | |
dependency.c (gfc_check_element_vs_element): Consider two unordered scalar subscripts as (potentially) equal.
* dependency.c (gfc_check_element_vs_element): Consider two
unordered scalar subscripts as (potentially) equal.
* gfortran.dg/dependency_9.f90: New test case.
From-SVN: r111687
Diffstat (limited to 'gcc/fortran/dependency.c')
| -rw-r--r-- | gcc/fortran/dependency.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/gcc/fortran/dependency.c b/gcc/fortran/dependency.c index 187b207..129caa3 100644 --- a/gcc/fortran/dependency.c +++ b/gcc/fortran/dependency.c @@ -739,8 +739,14 @@ gfc_check_element_vs_element (gfc_ref * lref, gfc_ref * rref, int n) i = gfc_dep_compare_expr (r_start, l_start); if (i == 0) return GFC_DEP_EQUAL; + /* Treat two scalar variables as potentially equal. This allows + us to prove that a(i,:) and a(j,:) have no dependency. See + Gerald Roth, "Evaluation of Array Syntax Dependence Analysis", + Proceedings of the International Conference on Parallel and + Distributed Processing Techniques and Applications (PDPTA2001), + Las Vegas, Nevada, June 2001. This used to be GFC_DEP_OVERLAP. */ if (i == -2) - return GFC_DEP_OVERLAP; + return GFC_DEP_EQUAL; return GFC_DEP_NODEP; } |