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| author | Vladimir Makarov <vmakarov@redhat.com> | 2011-12-20 21:29:36 +0000 |
|---|---|---|
| committer | Vladimir Makarov <vmakarov@gcc.gnu.org> | 2011-12-20 21:29:36 +0000 |
| commit | 9d19c7329c6da0b59df04b32bca26f7d2c1ce20a (patch) | |
| tree | 84a9907be731914d6a5e2d06a3ddeca3eab7ae65 /gcc | |
| parent | 6904889880ad58684c6eeaf366ab4af6167cd5b0 (diff) | |
| download | gcc-9d19c7329c6da0b59df04b32bca26f7d2c1ce20a.zip gcc-9d19c7329c6da0b59df04b32bca26f7d2c1ce20a.tar.gz gcc-9d19c7329c6da0b59df04b32bca26f7d2c1ce20a.tar.bz2 | |
re PR target/49865 (Unnecessary reload causes small bloat)
2011-12-20 Vladimir Makarov <vmakarov@redhat.com>
PR target/49865
* ira-costs.c (find_costs_and_classes): Prefer registers even
if the memory cost is the same.
From-SVN: r182553
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/ira-costs.c | 9 |
2 files changed, 14 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index ad53a03..9bbfbcb 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2011-12-20 Vladimir Makarov <vmakarov@redhat.com> + + PR target/49865 + * ira-costs.c (find_costs_and_classes): Prefer registers even + if the memory cost is the same. + 2011-12-20 Joseph Myers <joseph@codesourcery.com> * c-decl.c (diagnose_mismatched_decls, grokdeclarator, grokfield) diff --git a/gcc/ira-costs.c b/gcc/ira-costs.c index 4fa12a2..4f2f841 100644 --- a/gcc/ira-costs.c +++ b/gcc/ira-costs.c @@ -1693,7 +1693,14 @@ find_costs_and_classes (FILE *dump_file) else if (i_costs[k] == best_cost) best = ira_reg_class_subunion[best][rclass]; if (pass == flag_expensive_optimizations - && i_costs[k] < i_mem_cost + /* We still prefer registers to memory even at this + stage if their costs are the same. We will make + a final decision during assigning hard registers + when we have all info including more accurate + costs which might be affected by assigning hard + registers to other pseudos because the pseudos + involved in moves can be coalesced. */ + && i_costs[k] <= i_mem_cost && (reg_class_size[reg_class_subunion[alt_class][rclass]] > reg_class_size[alt_class])) alt_class = reg_class_subunion[alt_class][rclass]; |