diff options
| author | Jakub Jelinek <jakub@redhat.com> | 2018-01-12 21:04:14 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2018-01-12 21:04:14 +0100 |
| commit | d508a932f1c7b46c768db0da7f0dc726c4e2e141 (patch) | |
| tree | 53ac19b200822ae3cb46fd98384376e7fad1b01a /gcc/regrename.c | |
| parent | 708c4094eea2574473207a45d747994c9c2cbb56 (diff) | |
regrename.c (regrename_do_replace): If replacing the same reg multiple times, try to reuse last created gen_raw_REG.
* regrename.c (regrename_do_replace): If replacing the same
reg multiple times, try to reuse last created gen_raw_REG.
From-SVN: r256596
Diffstat (limited to 'gcc/regrename.c')
| -rw-r--r-- | gcc/regrename.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/gcc/regrename.c b/gcc/regrename.c index f930a65e0c1..dcec77adf75 100644 --- a/gcc/regrename.c +++ b/gcc/regrename.c @@ -963,6 +963,7 @@ regrename_do_replace (struct du_head *head, int reg) struct du_chain *chain; unsigned int base_regno = head->regno; machine_mode mode; + rtx last_reg = NULL_RTX, last_repl = NULL_RTX; for (chain = head->first; chain; chain = chain->next_use) { @@ -975,12 +976,16 @@ regrename_do_replace (struct du_head *head, int reg) gen_rtx_UNKNOWN_VAR_LOC (), true); else { - validate_change (chain->insn, chain->loc, - gen_raw_REG (GET_MODE (*chain->loc), reg), true); - if (regno >= FIRST_PSEUDO_REGISTER) - ORIGINAL_REGNO (*chain->loc) = regno; - REG_ATTRS (*chain->loc) = attr; - REG_POINTER (*chain->loc) = reg_ptr; + if (*chain->loc != last_reg) + { + last_repl = gen_raw_REG (GET_MODE (*chain->loc), reg); + if (regno >= FIRST_PSEUDO_REGISTER) + ORIGINAL_REGNO (last_repl) = regno; + REG_ATTRS (last_repl) = attr; + REG_POINTER (last_repl) = reg_ptr; + last_reg = *chain->loc; + } + validate_change (chain->insn, chain->loc, last_repl, true); } } |