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| author | Jakub Jelinek <jakub@redhat.com> | 2022-11-23 19:09:31 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@redhat.com> | 2022-11-23 19:09:31 +0100 |
| commit | 8a0fce6a51915c29584427fd376b40073c328090 (patch) | |
| tree | 4598badc17f58607c19570cf8d7703161fcd20da | |
| parent | c087fe834b19d6c281ce25f729d891bcd14ce404 (diff) | |
| download | gcc-8a0fce6a51915c29584427fd376b40073c328090.zip gcc-8a0fce6a51915c29584427fd376b40073c328090.tar.gz gcc-8a0fce6a51915c29584427fd376b40073c328090.tar.bz2 | |
c: Fix compile time hog in c_genericize [PR107127]
The complex multiplications result in deeply nested set of many SAVE_EXPRs,
which takes even on fast machines over 5 minutes to walk.
This patch fixes that by using walk_tree_without_duplicates where it is
instant.
2022-11-23 Andrew Pinski <apinski@marvell.com>
Jakub Jelinek <jakub@redhat.com>
PR c/107127
* c-gimplify.cc (c_genericize): Use walk_tree_without_duplicates
instead of walk_tree for c_genericize_control_r.
* gcc.dg/pr107127.c: New test.
| -rw-r--r-- | gcc/c-family/c-gimplify.cc | 4 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/pr107127.c | 12 |
2 files changed, 14 insertions, 2 deletions
diff --git a/gcc/c-family/c-gimplify.cc b/gcc/c-family/c-gimplify.cc index 039a4b9..0034d41 100644 --- a/gcc/c-family/c-gimplify.cc +++ b/gcc/c-family/c-gimplify.cc @@ -572,8 +572,8 @@ c_genericize (tree fndecl) bc_state_t save_state; push_cfun (DECL_STRUCT_FUNCTION (fndecl)); save_bc_state (&save_state); - walk_tree (&DECL_SAVED_TREE (fndecl), c_genericize_control_r, - NULL, NULL); + walk_tree_without_duplicates (&DECL_SAVED_TREE (fndecl), + c_genericize_control_r, NULL); restore_bc_state (&save_state); pop_cfun (); } diff --git a/gcc/testsuite/gcc.dg/pr107127.c b/gcc/testsuite/gcc.dg/pr107127.c new file mode 100644 index 0000000..f7ae87d --- /dev/null +++ b/gcc/testsuite/gcc.dg/pr107127.c @@ -0,0 +1,12 @@ +/* PR c/107127 */ +/* { dg-do compile } */ +/* { dg-options "" } */ + +int *v; + +_Complex double +foo (_Complex double a, double b, double c) +{ + return v[0] / ((((c * (0 - 0 / a + 699.0 + 7.05 - 286.0 - +-4.65 + 1.57 + 0) * 0.1 - 3.28 + 4.22 + 0.1)) * b + 5.06) + * 1.23 * 8.0 * 12.0 * 16.0 * 2.0 * 2.0 * 0.25 * 0.125 * 18.2 * -15.25 * 0.0001 + * 42.0 * 0.012 - 8.45 + 0 + 88.0 + 6.96 + 867.0 + 9.10 - 7.04 * -1.0); |