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Vector subregs
- From: Dale Johannesen <dalej at apple dot com>
- To: gcc-patches at gcc dot gnu dot org, gcc at gcc dot gnu dot org
- Date: Fri, 14 Dec 2001 10:44:16 -0800
- Subject: Vector subregs
The main question in my last post got somewhat lost in the legalities,
so here is a patch to do what I think should happen. Subreg's of vectors
don't have a register implementation on any hardware AFAIK, so there is
no reason to support them.
2001-12-14 Dale Johannesen <dalej@apple.com>
* function.c: Prevent subregs of vectors from being generated.
Index: function.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/function.c,v
retrieving revision 1.330
diff -u -d -b -w -c -3 -p -r1.330 function.c
cvs server: conflicting specifications of output style
*** function.c 2001/12/04 09:29:52 1.330
--- function.c 2001/12/14 18:39:57
*************** purge_addressof_1 (loc, insn, force, sto
*** 3088,3093 ****
--- 3088,3095 ----
/* Don't even consider working with paradoxical subregs,
or the moral equivalent seen here. */
if (size_x <= size_sub
+ && GET_MODE_CLASS (GET_MODE (sub)) != MODE_VECTOR_INT
+ && GET_MODE_CLASS (GET_MODE (sub)) != MODE_VECTOR_FLOAT
&& int_mode_for_mode (GET_MODE (sub)) != BLKmode)
{
/* Do a bitfield insertion to mirror what would happen