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| author | Olivier Hainque <hainque@adacore.com> | 2012-06-28 07:56:40 +0000 |
|---|---|---|
| committer | Olivier Hainque <hainque@gcc.gnu.org> | 2012-06-28 07:56:40 +0000 |
| commit | ecd49d513b49e83434723815d2cf0fab4f328280 (patch) | |
| tree | 46944d76395ac668b80f580398d3ed5da26fd2fe | |
| parent | e07b233d2e7b2add3e3ca6564ad4f8295e8a8cb6 (diff) | |
| download | gcc-ecd49d513b49e83434723815d2cf0fab4f328280.zip gcc-ecd49d513b49e83434723815d2cf0fab4f328280.tar.gz gcc-ecd49d513b49e83434723815d2cf0fab4f328280.tar.bz2 | |
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
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/expr.c | 9 |
2 files changed, 11 insertions, 3 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index dd228e8..213cca1 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -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>, Uros Bizjak <ubizjak@gmail.com>, Jakub Jelinek <jakub@redhat.com> @@ -520,10 +520,13 @@ convert_move (rtx to, rtx from, int unsignedp) /* No special multiword conversion insn; do it by hand. */ start_sequence (); - /* Since we will turn this into a no conflict block, we must ensure - that the source does not overlap the target. */ + /* Since we will turn this into a no conflict block, we must ensure the + 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); /* Get a copy of FROM widened to a word, if necessary. */ |