------- Comment #3 from ubizjak at gmail dot com 2008-05-16 12:12 -------
Patch in testing:
Index: i386.h
===================================================================
--- i386.h (revision 135408)
+++ i386.h (working copy)
@@ -1516,6 +1516,14 @@
#define SECONDARY_MEMORY_NEEDED(CLASS1, CLASS2, MODE) \
ix86_secondary_memory_needed ((CLASS1), (CLASS2), (MODE), 1)
+/* Get_secondary_mem widens integral modes to BITS_PER_WORD.
+ There is no need to emit full 64 bit move for integral modes
+ that can be moved using 32 bit move. */
+#define SECONDARY_MEMORY_NEEDED_MODE(MODE) \
+ (GET_MODE_BITSIZE (MODE) < 32 && INTEGRAL_MODE_P (MODE) \
+ ? mode_for_size (32, GET_MODE_CLASS (MODE), 0) \
+ : MODE)
+
/* QImode spills from non-QI registers need a scratch. This does not
happen often -- the only example so far requires an uninitialized
pseudo. */
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36246
