From a7de2c2a71940a25408c1320498c1c1ca2472313 Mon Sep 17 00:00:00 2001
From: Richard Henderson <rth@redhat.com>
Date: Sat, 10 Dec 2011 12:42:55 -0800
Subject: Let GET_MODE_2XWIDER_MODE find a double-width vector mode.

        * genmodes.c (struct mode_data): Remove wider_2x member.
        (blank_mode): Adjust initializer.
        (calc_wider_mode): Use XALLOCAVEC.
        (emit_move_wider): Select double-width same-element vectors for
        2xwider vectors.
        * machmode.h (GET_MODE_2XWIDER_MODE): Update documentation.
        * config/i386/i386.c (doublesize_vector_mode): Remove.
        (expand_vselect_vconcat): Use GET_MODE_2XWIDER_MODE instead.

From-SVN: r182191
---
 gcc/machmode.h | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'gcc/machmode.h')

diff --git a/gcc/machmode.h b/gcc/machmode.h
index b965d0f..4a3f6f5 100644
--- a/gcc/machmode.h
+++ b/gcc/machmode.h
@@ -221,6 +221,8 @@ extern const unsigned char mode_nunits[NUM_MACHINE_MODES];
 extern const unsigned char mode_wider[NUM_MACHINE_MODES];
 #define GET_MODE_WIDER_MODE(MODE) ((enum machine_mode) mode_wider[MODE])
 
+/* For scalars, this is a mode with twice the precision.  For vectors,
+   this is a mode with the same inner mode but with twice the elements.  */
 extern const unsigned char mode_2xwider[NUM_MACHINE_MODES];
 #define GET_MODE_2XWIDER_MODE(MODE) ((enum machine_mode) mode_2xwider[MODE])
 
-- 
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