From: Vladimir N. Makarov Date: Fri, 13 Mar 2020 18:58:57 +0000 (-0400) Subject: PR92303: Try to simplify memory subreg. X-Git-Tag: basepoints/gcc-11~913 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=a4504f32c056db781a2bdc104dffa1b29684c930;p=thirdparty%2Fgcc.git 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. --- diff --git a/gcc/ChangeLog b/gcc/ChangeLog index d63b83194d5d..4ea81e6c404b 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 0022611785c6..01256e711bca 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