From b8ac95761a5c0a902fa2547e9345febf26713bf5 Mon Sep 17 00:00:00 2001 From: Segher Boessenkool Date: Thu, 25 Oct 2018 00:34:40 +0200 Subject: combine: Don't do make_more_copies for dest PC (PR87720) Jumps are written in RTL as moves to PC. But the latter has no mode, so we shouldn't try to use it. Since the optimization this routine does does not really help for jumps at all, let's just skip it. PR rtl-optimization/87720 * combine.c (make_more_copies): Skip if the dest is pc_rtx. From-SVN: r265474 --- gcc/combine.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'gcc/combine.c') diff --git a/gcc/combine.c b/gcc/combine.c index 8ec6809..2b93328 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -14958,6 +14958,8 @@ make_more_copies (void) continue; rtx src = SET_SRC (set); rtx dest = SET_DEST (set); + if (dest == pc_rtx) + continue; if (GET_CODE (src) == SUBREG) src = SUBREG_REG (src); if (!(REG_P (src) && HARD_REGISTER_P (src))) -- cgit v1.1