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| author | Maxim Kuvyrkov <maxim@codesourcery.com> | 2010-07-27 19:48:15 +0000 |
|---|---|---|
| committer | Maxim Kuvyrkov <mkuvyrkov@gcc.gnu.org> | 2010-07-27 19:48:15 +0000 |
| commit | cad9aa150ba3ff8c1dc34bf428fc7146dce463b0 (patch) | |
| tree | ef6e287dda7baf7be12f1fb62bf64d66c6a8211d /gcc/params.def | |
| parent | 9b9ee6d392b6f4f50bacb299e8e1350b1173add8 (diff) | |
| download | gcc-cad9aa150ba3ff8c1dc34bf428fc7146dce463b0.tar.gz | |
re PR target/42495 (redundant memory load)
PR target/42495
PR middle-end/42574
* basic-block.h (get_dominated_to_depth): Declare.
* dominance.c (get_dominated_to_depth): New function, use
get_all_dominated_blocks as a base.
(get_all_dominated_blocks): Use get_dominated_to_depth.
* gcse.c (occr_t, VEC (occr_t, heap)): Define.
(hoist_exprs): Remove.
(alloc_code_hoist_mem, free_code_hoist_mem): Update.
(compute_code_hoist_vbeinout): Add debug print outs.
(hoist_code): Partially rewrite, simplify. Use get_dominated_to_depth.
* params.def (PARAM_MAX_HOIST_DEPTH): New parameter to avoid
quadratic behavior.
* params.h (MAX_HOIST_DEPTH): New macro.
* doc/invoke.texi (max-hoist-depth): Document.
From-SVN: r162597
Diffstat (limited to 'gcc/params.def')
| -rw-r--r-- | gcc/params.def | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/gcc/params.def b/gcc/params.def index ada50f67093..1d4e6872259 100644 --- a/gcc/params.def +++ b/gcc/params.def @@ -240,6 +240,14 @@ DEFPARAM(PARAM_GCSE_UNRESTRICTED_COST, "Cost at which GCSE optimizations will not constraint the distance an expression can travel", 3, 0, 0) +/* How deep from a given basic block the dominator tree should be searched + for expressions to hoist to the block. The value of 0 will avoid limiting + the search. */ +DEFPARAM(PARAM_MAX_HOIST_DEPTH, + "max-hoist-depth", + "Maximum depth of search in the dominator tree for expressions to hoist", + 30, 0, 0) + /* This parameter limits the number of insns in a loop that will be unrolled, and by how much the loop is unrolled. |