From a4504f32c056db781a2bdc104dffa1b29684c930 Mon Sep 17 00:00:00 2001 From: "Vladimir N. Makarov" Date: Fri, 13 Mar 2020 14:58:57 -0400 Subject: [PATCH] PR92303: Try to simplify memory subreg. 2020-03-13 Vladimir Makarov PR rtl-optimization/92303 * lra-spills.c (remove_pseudos): Try to simplify memory subreg. --- gcc/ChangeLog | 5 +++++ gcc/lra-spills.c | 11 ++++++++++- 2 files changed, 15 insertions(+), 1 deletion(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index d63b83194d5..4ea81e6c404 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2020-03-13 Vladimir Makarov + + PR rtl-optimization/92303 + * lra-spills.c (remove_pseudos): Try to simplify memory subreg. + 2020-03-13 Segher Boessenkool PR rtl-optimization/94148 diff --git a/gcc/lra-spills.c b/gcc/lra-spills.c index 0022611785c..01256e711bc 100644 --- a/gcc/lra-spills.c +++ b/gcc/lra-spills.c @@ -421,7 +421,16 @@ remove_pseudos (rtx *loc, rtx_insn *insn) if (*loc == NULL_RTX) return res; code = GET_CODE (*loc); - if (code == REG && (i = REGNO (*loc)) >= FIRST_PSEUDO_REGISTER + if (code == SUBREG && REG_P (SUBREG_REG (*loc))) + { + /* Try to remove memory subregs to simplify LRA job + and avoid LRA cycling in case of subreg memory reload. */ + res = remove_pseudos (&SUBREG_REG (*loc), insn); + if (GET_CODE (SUBREG_REG (*loc)) == MEM) + alter_subreg (loc, false); + return res; + } + else if (code == REG && (i = REGNO (*loc)) >= FIRST_PSEUDO_REGISTER && lra_get_regno_hard_regno (i) < 0 /* We do not want to assign memory for former scratches because it might result in an address reload for some targets. In -- 2.30.2