From d508a932f1c7b46c768db0da7f0dc726c4e2e141 Mon Sep 17 00:00:00 2001 From: Jakub Jelinek Date: Fri, 12 Jan 2018 21:04:14 +0100 Subject: [PATCH] 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 --- gcc/ChangeLog | 5 ++++- gcc/regrename.c | 17 +++++++++++------ 2 files changed, 15 insertions(+), 7 deletions(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 4b4b57783be..d3bd1442588 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,8 @@ 2018-01-12 Jakub Jelinek + * regrename.c (regrename_do_replace): If replacing the same + reg multiple times, try to reuse last created gen_raw_REG. + PR debug/81155 * bb-reorder.c (pass_partition_blocks::gate): In lto don't partition main to workaround a bug in GDB. @@ -1394,7 +1397,7 @@ 2018-01-04 Jakub Jelinek PR debug/83666 - * cfgexpand.c (expand_dbeug_expr) : Punt if mode + * cfgexpand.c (expand_debug_expr) : Punt if mode is BLKmode and bitpos not zero or mode change is needed. 2018-01-04 Richard Sandiford 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); } } -- 2.30.2