From: Richard Biener <rguenther@suse.de>
Date: Mon, 1 Feb 2021 08:18:43 +0000 (+0100)
Subject: rtl-optimization/98863 - prune RD with LIVE in STV
X-Git-Tag: releases/gcc-10.3.0~326
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ab5b267e1e2d29c4f1acf39af85e247894193168;p=thirdparty%2Fgcc.git

rtl-optimization/98863 - prune RD with LIVE in STV

This sets DF_RD_PRUNE_DEAD_DEFS like all other uses of the UD/DU
chain problems which makes the RD problem consume a lot less memory.

2021-02-01  Richard Biener  <rguenther@suse.de>

	PR rtl-optimization/98863
	* config/i386/i386-features.c (convert_scalars_to_vector):
	Set DF_RD_PRUNE_DEAD_DEFS.

(cherry picked from commit 972918eea873f8b1663151316c4b3aee7ae028e2)
---

diff --git a/gcc/config/i386/i386-features.c b/gcc/config/i386/i386-features.c
index 78fb373db6ef..b1109de7cb61 100644
--- a/gcc/config/i386/i386-features.c
+++ b/gcc/config/i386/i386-features.c
@@ -1615,7 +1615,7 @@ convert_scalars_to_vector (bool timode_p)
     bitmap_initialize (&candidates[i], &bitmap_default_obstack);
 
   calculate_dominance_info (CDI_DOMINATORS);
-  df_set_flags (DF_DEFER_INSN_RESCAN);
+  df_set_flags (DF_DEFER_INSN_RESCAN | DF_RD_PRUNE_DEAD_DEFS);
   df_chain_add_problem (DF_DU_CHAIN | DF_UD_CHAIN);
   df_analyze ();