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expr.c (convert_move): Latch mem integer inputs into a register before expanding a multi-instructions... 

* expr.c (convert_move): Latch mem integer inputs into a
        register before expanding a multi-instructions sequence.

From-SVN: r189040
This commit is contained in:
Olivier Hainque 2012-06-28 07:56:40 +00:00 committed by Olivier Hainque
parent e07b233d2e
commit ecd49d513b
2 changed files with 11 additions and 3 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
2012-06-28 OLivier Hainque <hainque@adacore.com>
* expr.c (convert_move): Latch mem integer inputs into a
register before expanding a multi-instructions sequence.
2012-06-28 Alexandre Oliva <aoliva@redhat.com>, 2012-06-28 Alexandre Oliva <aoliva@redhat.com>,
Uros Bizjak <ubizjak@gmail.com>, Uros Bizjak <ubizjak@gmail.com>,
Jakub Jelinek <jakub@redhat.com> Jakub Jelinek <jakub@redhat.com>

9
gcc/expr.c
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@ -520,10 +520,13 @@ convert_move (rtx to, rtx from, int unsignedp)
/* No special multiword conversion insn; do it by hand. */ /* No special multiword conversion insn; do it by hand. */
start_sequence (); start_sequence ();
/* Since we will turn this into a no conflict block, we must ensure /* Since we will turn this into a no conflict block, we must ensure the
that the source does not overlap the target. */ the source does not overlap the target so force it into an isolated
register when maybe so. Likewise for any MEM input, since the
conversion sequence might require several references to it and we
must ensure we're getting the same value every time. */
if (reg_overlap_mentioned_p (to, from)) if (MEM_P (from) || reg_overlap_mentioned_p (to, from))
from = force_reg (from_mode, from); from = force_reg (from_mode, from);
/* Get a copy of FROM widened to a word, if necessary. */ /* Get a copy of FROM widened to a word, if necessary. */