diff options
| author | vmakarov <vmakarov@138bc75d-0d04-0410-961f-82ee72b054a4> | 2013-04-24 20:27:33 +0000 |
|---|---|---|
| committer | vmakarov <vmakarov@138bc75d-0d04-0410-961f-82ee72b054a4> | 2013-04-24 20:27:33 +0000 |
| commit | 74855d080d0657185317ae63bac158040908c3fe (patch) | |
| tree | b6ddc9d79010428fd98fc997fa4e36e433e28267 /gcc/lra-constraints.c | |
| parent | 6c4ccb7bca11fdd0ba462e36d013e80d040aa9ae (diff) | |
| download | gcc-74855d080d0657185317ae63bac158040908c3fe.tar.gz | |
2013-04-24 Vladimir Makarov <vmakarov@redhat.com>
PR rtl-optimizations/57046
* lra-constraints (split_reg): Set up lra_risky_transformations_p
for multi-reg splits.
2013-04-24 Vladimir Makarov <vmakarov@redhat.com>
PR rtl-optimizations/57046
* gcc.target/i386/pr57046.c: New test.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@198263 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/lra-constraints.c')
| -rw-r--r-- | gcc/lra-constraints.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/gcc/lra-constraints.c b/gcc/lra-constraints.c index 24782dcdec7..d364ef3407f 100644 --- a/gcc/lra-constraints.c +++ b/gcc/lra-constraints.c @@ -4198,7 +4198,7 @@ split_reg (bool before_p, int original_regno, rtx insn, rtx next_usage_insns) { enum reg_class rclass; rtx original_reg; - int hard_regno; + int hard_regno, nregs; rtx new_reg, save, restore, usage_insn; bool after_p; bool call_save_p; @@ -4208,10 +4208,12 @@ split_reg (bool before_p, int original_regno, rtx insn, rtx next_usage_insns) rclass = ira_allocno_class_translate[REGNO_REG_CLASS (original_regno)]; hard_regno = original_regno; call_save_p = false; + nregs = 1; } else { hard_regno = reg_renumber[original_regno]; + nregs = hard_regno_nregs[hard_regno][PSEUDO_REGNO_MODE (original_regno)]; rclass = lra_get_allocno_class (original_regno); original_reg = regno_reg_rtx[original_regno]; call_save_p = need_for_call_save_p (original_regno); @@ -4324,6 +4326,13 @@ split_reg (bool before_p, int original_regno, rtx insn, rtx next_usage_insns) before_p ? NULL_RTX : save, call_save_p ? "Add save<-reg" : "Add split<-reg"); + if (nregs > 1) + /* If we are trying to split multi-register. We should check + conflicts on the next assignment sub-pass. IRA can allocate on + sub-register levels, LRA do this on pseudos level right now and + this discrepancy may create allocation conflicts after + splitting. */ + lra_risky_transformations_p = true; if (lra_dump_file != NULL) fprintf (lra_dump_file, " ))))))))))))))))))))))))))))))))))))))))))))))))\n"); |