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| author | Zdenek Dvorak <dvorakz@suse.cz> | 2004-10-01 20:26:37 +0200 |
|---|---|---|
| committer | Zdenek Dvorak <rakdver@gcc.gnu.org> | 2004-10-01 18:26:37 +0000 |
| commit | 47bcd07d56940085a9b606833d729812ea9c02a2 (patch) | |
| tree | 730348fe9c15ef1c758714891bae729413c7f6e6 /gcc/tree-ssa-loop-ivcanon.c | |
| parent | 734268f5901c7691b3fc9e33a9e22fc1c4f8b0bb (diff) | |
| download | gcc-47bcd07d56940085a9b606833d729812ea9c02a2.zip gcc-47bcd07d56940085a9b606833d729812ea9c02a2.tar.gz gcc-47bcd07d56940085a9b606833d729812ea9c02a2.tar.bz2 | |
common.opt (ftree-loop-ivcanon): Enable by default.
* common.opt (ftree-loop-ivcanon): Enable by default.
* tree-ssa-loop-ivcanon.c (try_unroll_loop_completely):
Enable complete loop unrolling.
(canonicalize_induction_variables, tree_unroll_loops_completely):
Reset scev info.
* gcc.dg/tree-ssa/loop-1.c: Check that unrolling occurs already on
tree level.
From-SVN: r88404
Diffstat (limited to 'gcc/tree-ssa-loop-ivcanon.c')
| -rw-r--r-- | gcc/tree-ssa-loop-ivcanon.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/gcc/tree-ssa-loop-ivcanon.c b/gcc/tree-ssa-loop-ivcanon.c index 66fee03..4635a02 100644 --- a/gcc/tree-ssa-loop-ivcanon.c +++ b/gcc/tree-ssa-loop-ivcanon.c @@ -175,12 +175,9 @@ try_unroll_loop_completely (struct loops *loops ATTRIBUTE_UNUSED, COND_EXPR_COND (cond) = dont_exit; modify_stmt (cond); -#if 0 - /* The necessary infrastructure is not in yet. */ if (!tree_duplicate_loop_to_header_edge (loop, loop_preheader_edge (loop), loops, n_unroll, NULL, NULL, NULL, NULL, 0)) -#endif { COND_EXPR_COND (cond) = old_cond; return false; @@ -263,6 +260,10 @@ canonicalize_induction_variables (struct loops *loops) canonicalize_loop_induction_variables (loops, loop, true, false, true); } + /* Clean up the information about numbers of iterations, since brute force + evaluation could reveal new information. */ + scev_reset (); + #if 0 /* The necessary infrastructure is not in yet. */ if (changed) @@ -291,6 +292,10 @@ tree_unroll_loops_completely (struct loops *loops) !flag_tree_loop_ivcanon); } + /* Clean up the information about numbers of iterations, since complete + unrolling might have invalidated it. */ + scev_reset (); + #if 0 /* The necessary infrastructure is not in yet. */ if (changed) |