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Prevent aborts taking a vector mode subreg of a constant integer

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From-SVN: r52467
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Bernd Schmidt 2002-04-18 11:29:19 +00:00 committed by Bernd Schmidt
parent 3d980b9f8a
commit 2e676d7878
2 changed files with 13 additions and 0 deletions
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4
gcc/ChangeLog
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@ -4,6 +4,10 @@
(handle_vector_size_attribute): Use it to avoid generating a
new type node each time we are called.
* combine.c (subst): Avoid trying to make a vector mode subreg of
an integer constant.
(gen_lowpart_for_combine): Likewise.
2002-04-18 Roger Sayle <roger@eyesopen.com>
Jakub Jelinek <jakub@redhat.com>

9
gcc/combine.c
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@ -3538,6 +3538,9 @@ subst (x, from, to, in_dest, unique_copy)
if (GET_CODE (new) == CONST_INT && GET_CODE (x) == SUBREG)
{
if (VECTOR_MODE_P (GET_MODE (x)))
return gen_rtx_CLOBBER (VOIDmode, const0_rtx);
x = simplify_subreg (GET_MODE (x), new,
GET_MODE (SUBREG_REG (x)),
SUBREG_BYTE (x));
@ -9800,6 +9803,12 @@ gen_lowpart_for_combine (mode, x)
|| GET_MODE_SIZE (GET_MODE (x)) == GET_MODE_SIZE (mode)))
return gen_rtx_CLOBBER (GET_MODE (x), const0_rtx);
/* simplify_gen_subreg does not know how to handle the case where we try
to convert an integer constant to a vector.
??? We could try to teach it to generate CONST_VECTORs. */
if (GET_MODE (x) == VOIDmode && VECTOR_MODE_P (mode))
return gen_rtx_CLOBBER (GET_MODE (x), const0_rtx);
/* X might be a paradoxical (subreg (mem)). In that case, gen_lowpart
won't know what to do. So we will strip off the SUBREG here and
process normally. */