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| author | Richard Biener <rguenther@suse.de> | 2022-03-01 09:24:26 +0100 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2022-03-01 15:24:31 +0100 |
| commit | 54ef95cc4d1f3f2cde7c1f13250f889ffb81ca75 (patch) | |
| tree | a5b5025b9586d3993014db10e0bef189345d5d15 | |
| parent | 8fba8a8c26a22fc5fbc17a99605e0226dc6fbf28 (diff) | |
| download | gcc-54ef95cc4d1f3f2cde7c1f13250f889ffb81ca75.zip gcc-54ef95cc4d1f3f2cde7c1f13250f889ffb81ca75.tar.gz gcc-54ef95cc4d1f3f2cde7c1f13250f889ffb81ca75.tar.bz2 | |
tree-optimization/104716 - check if we can copy loop in loop distribution
The following checks whether we can copy the loop before attempting
to do so in loop distribution. In the testcase there's a computed
goto and thus abnormal edges which we cannot redirect.
2022-03-01 Richard Biener <rguenther@suse.de>
PR tree-optimization/104716
* tree-loop-distribution.cc (find_seed_stmts_for_distribution):
Check if we can copy the loop.
* gfortran.dg/pr104716.f: New testcase.
| -rw-r--r-- | gcc/testsuite/gfortran.dg/pr104716.f | 31 | ||||
| -rw-r--r-- | gcc/tree-loop-distribution.cc | 9 |
2 files changed, 39 insertions, 1 deletions
diff --git a/gcc/testsuite/gfortran.dg/pr104716.f b/gcc/testsuite/gfortran.dg/pr104716.f new file mode 100644 index 0000000..97f899a --- /dev/null +++ b/gcc/testsuite/gfortran.dg/pr104716.f @@ -0,0 +1,31 @@ +! { dg-do compile } +! { dg-options "-std=legacy -O2 -ftree-loop-distribution -fno-move-loop-stores -fno-tree-dominator-opts" } + + SUBROUTINE FOO() + + COMMON /WORK/ C2(2, 2) + + DIMENSION D11(2) + + EQUIVALENCE (D11(1), C2(1, 1)) + + DO 40 I = 1, 2 + DO 30 J = 1, 2 + ASSIGN 10 TO ILBL + IF (C2(J, I) .NE. 0.0) THEN + ASSIGN 20 TO ILBL + ENDIF + GO TO ILBL + 10 CONTINUE + 20 CONTINUE + C2(J, I) = C2(J, I) + 1 + 30 CONTINUE + 40 CONTINUE + + DO 50 I = 1, 2 + PRINT 90, I + 50 CONTINUE + + RETURN + 90 FORMAT(I5) + END diff --git a/gcc/tree-loop-distribution.cc b/gcc/tree-loop-distribution.cc index 8ee40d8..db6e909 100644 --- a/gcc/tree-loop-distribution.cc +++ b/gcc/tree-loop-distribution.cc @@ -3277,8 +3277,15 @@ find_seed_stmts_for_distribution (class loop *loop, vec<gimple *> *work_list) work_list->safe_push (stmt); } } + bool res = work_list->length () > 0; + if (res && !can_copy_bbs_p (bbs, loop->num_nodes)) + { + if (dump_file && (dump_flags & TDF_DETAILS)) + fprintf (dump_file, "cannot copy loop %d.\n", loop->num); + res = false; + } free (bbs); - return work_list->length () > 0; + return res; } /* A helper function for generate_{rawmemchr,strlen}_builtin functions in order |