On December 2, 2017 1:14:15 AM GMT+01:00, Jakub Jelinek <ja...@redhat.com>
wrote:
>Hi!
>
>In TYPE_MODE we have a hack for vector types where we dynamically
>adjust it based on whether it is used from a function where the vector
>mode
>is or isn't supported (depending on target attribute, function
>multiversioning, etc.), but we don't have anything like that in
>DECL_MODE.
>
>The following is just a small hack that should be backportable to
>adjust
>similarly DECL_MODE when looking at fields - for static VAR_DECLs we
>already
>have code to cope with that, furthermore we need to cope there with the
>case where DECL_RTL is created in one context and used in another one.
>
>Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
OK.
Richard.
>2017-12-01 Jakub Jelinek <ja...@redhat.com>
>
> PR target/78643
> PR target/80583
> * expr.c (get_inner_reference): If DECL_MODE of a non-bitfield
> is BLKmode for vector field with vector raw mode, use TYPE_MODE
> instead of DECL_MODE.
>
> * gcc.target/i386/pr80583.c: New test.
>
>--- gcc/expr.c.jj 2017-11-27 09:27:41.000000000 +0100
>+++ gcc/expr.c 2017-12-01 11:36:19.011863308 +0100
>@@ -7032,7 +7032,16 @@ get_inner_reference (tree exp, HOST_WIDE
> size. */
> mode = TYPE_MODE (DECL_BIT_FIELD_TYPE (field));
> else if (!DECL_BIT_FIELD (field))
>- mode = DECL_MODE (field);
>+ {
>+ mode = DECL_MODE (field);
>+ /* For vector fields re-check the target flags, as DECL_MODE
>+ could have been set with different target flags than
>+ the current function has. */
>+ if (mode == BLKmode
>+ && VECTOR_TYPE_P (TREE_TYPE (field))
>+ && VECTOR_MODE_P (TYPE_MODE_RAW (TREE_TYPE (field))))
>+ mode = TYPE_MODE (TREE_TYPE (field));
>+ }
> else if (DECL_MODE (field) == BLKmode)
> blkmode_bitfield = true;
>
>--- gcc/testsuite/gcc.target/i386/pr80583.c.jj 2017-12-01
>11:44:28.106603314 +0100
>+++ gcc/testsuite/gcc.target/i386/pr80583.c 2017-12-01
>11:44:12.000000000 +0100
>@@ -0,0 +1,13 @@
>+/* PR target/80583 */
>+/* { dg-do compile } */
>+/* { dg-options "-O0 -mno-avx" } */
>+
>+typedef int V __attribute__((__vector_size__(32)));
>+struct S { V a; };
>+
>+V __attribute__((target ("avx")))
>+foo (struct S *b)
>+{
>+ V x = b->a;
>+ return x;
>+}
>
> Jakub
