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| -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]; |