From 5aa14feece79853511c91875f7d04f12e597bad1 Mon Sep 17 00:00:00 2001 From: Richard Stallman Date: Fri, 27 Nov 1992 23:52:02 +0000 Subject: [PATCH] (find_reloads) [SMALL_REGISTER_CLASSES]: Don't use preferred_class for a multiword register. From-SVN: r2815 --- gcc/reload.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/gcc/reload.c b/gcc/reload.c index c4f46bfb91a..d440eeb69ec 100644 --- a/gcc/reload.c +++ b/gcc/reload.c @@ -2685,11 +2685,18 @@ find_reloads (insn, replace, ind_levels, live_known, reload_reg_p) Don't bother with this if this alternative will accept this operand. + Don't do this for a multiword operand, if + we have to worry about small classes, because making reg groups + harder to allocate is asking for trouble. + Don't do this if the preferred class has only one register because we might otherwise exhaust the class. */ if (! win && this_alternative[i] != (int) NO_REGS +#ifdef SMALL_REGISTER_CLASSES + && GET_MODE_SIZE (operand_mode[i]) <= UNITS_PER_WORD +#endif && reg_class_size[(int) preferred_class[i]] > 1) { if (! reg_class_subset_p (this_alternative[i], -- 2.30.2