From: Bernd Schmidt <bernds@redhat.co.uk>
Date: Fri, 8 Sep 2000 09:41:07 +0000 (+0000)
Subject: Fix computation of need_mode in choose_reload_regs.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=ce701d1bd7218c2c055840da396761814cf2fdf6;p=gcc.git

Fix computation of need_mode in choose_reload_regs.

From-SVN: r36264
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 6e2837b660a..288f380afda 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -2,6 +2,8 @@
 
 	* combine.c (combine_simplify_rtx): Try to simplify VEC_SELECT of a
 	VEC_CONCAT.
+	From Richard Henderson:
+	* reload1.c (choose_reload_regs): Compute need_mode properly.
 
 2000-09-07  Richard Henderson  <rth@cygnus.com>
 
diff --git a/gcc/reload1.c b/gcc/reload1.c
index b09f9eb8222..fb840477ba7 100644
--- a/gcc/reload1.c
+++ b/gcc/reload1.c
@@ -5304,8 +5304,13 @@ choose_reload_regs (chain)
 		  i = REGNO (last_reg) + word;
 		  last_class = REGNO_REG_CLASS (i);
 
-		  need_mode = smallest_mode_for_size ((word+1) * UNITS_PER_WORD,
-						      GET_MODE_CLASS (mode));
+		  if (word == 0)
+		    need_mode = mode;
+		  else
+		    need_mode
+		      = smallest_mode_for_size (GET_MODE_SIZE (mode)
+						+ word * UNITS_PER_WORD,
+						GET_MODE_CLASS (mode));
 
 		  if (
 #ifdef CLASS_CANNOT_CHANGE_MODE