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| author | Richard Henderson <rth@redhat.com> | 2015-11-09 01:19:59 -0800 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 2015-11-09 01:19:59 -0800 |
| commit | 16734677674ae7f58f4339fa97a91411a347e5db (patch) | |
| tree | 968f69548931b685eae5707facf5b72c95bd3683 /gcc/config/i386/i386-protos.h | |
| parent | fe5f926316422c9c3bbcec1a412cd5fc14cd47d7 (diff) | |
| download | gcc-16734677674ae7f58f4339fa97a91411a347e5db.zip gcc-16734677674ae7f58f4339fa97a91411a347e5db.tar.gz gcc-16734677674ae7f58f4339fa97a91411a347e5db.tar.bz2 | |
i386: Disallow address spaces with string insns
While cmps and movs allow a segment override of the ds:esi
source, the es:edi source/destination cannot be overriden.
Simplify things in the backend for now by disallowing
segments for string insns entirely.
* config/i386/i386.c (ix86_check_no_addr_space): New.
(decide_alg): Add have_as parameter.
(alg_usable_p): Likewise; disable rep algorithms if set.
(ix86_expand_set_or_movmem): Notice if either MEM has a
non-default address space.
(ix86_expand_strlen): Likewise.
* config/i386/i386.md (strmov, strset): Likewise.
(*strmovdi_rex_1): Use ix86_check_no_addr_space.
(*strmovsi_1, *strmovqi_1, *rep_movdi_rex64, *rep_movsi, *rep_movqi,
*strsetdi_rex_1, *strsetsi_1, *strsethi_1, *strsetqi_1,
*rep_stosdi_rex64, *rep_stossi, *rep_stosqi, *cmpstrnqi_nz_1,
*cmpstrnqi_1, *strlenqi_1): Likewise.
From-SVN: r230002
Diffstat (limited to 'gcc/config/i386/i386-protos.h')
| -rw-r--r-- | gcc/config/i386/i386-protos.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/gcc/config/i386/i386-protos.h b/gcc/config/i386/i386-protos.h index 6a17ef4..5e46833 100644 --- a/gcc/config/i386/i386-protos.h +++ b/gcc/config/i386/i386-protos.h @@ -141,6 +141,7 @@ extern void ix86_split_ashr (rtx *, rtx, machine_mode); extern void ix86_split_lshr (rtx *, rtx, machine_mode); extern rtx ix86_find_base_term (rtx); extern bool ix86_check_movabs (rtx, int); +extern bool ix86_check_no_addr_space (rtx); extern void ix86_split_idivmod (machine_mode, rtx[], bool); extern rtx assign_386_stack_local (machine_mode, enum ix86_stack_slot); |