diff options
| author | ebotcazou <ebotcazou@138bc75d-0d04-0410-961f-82ee72b054a4> | 2003-06-13 22:13:07 +0000 |
|---|---|---|
| committer | ebotcazou <ebotcazou@138bc75d-0d04-0410-961f-82ee72b054a4> | 2003-06-13 22:13:07 +0000 |
| commit | ac9db7eb0ee0587d6516344967ce936d29f71952 (patch) | |
| tree | 2f6993a5122c450524b49fbe107c8f433c414d67 | |
| parent | e4ea1ced49111c9110f410f9820c5e2a8f4feb71 (diff) | |
| download | gcc-ac9db7eb0ee0587d6516344967ce936d29f71952.tar.gz | |
PR bootstrap/10983
* combine.c (make_extraction): Use gen_lowpart_for_combine
when extracting from a REG and not in the destination of a SET.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@67916 138bc75d-0d04-0410-961f-82ee72b054a4
| -rw-r--r-- | gcc/ChangeLog | 7 | ||||
| -rw-r--r-- | gcc/combine.c | 49 |
2 files changed, 34 insertions, 22 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index c526f71cd7b..9a5424692e3 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2003-06-13 Jim Wilson <wilson@tuliptree.org> + Eric Botcazou <ebotcazou@libertysurf.fr> + + PR bootstrap/10983 + * combine.c (make_extraction): Use gen_lowpart_for_combine + when extracting from a REG and not in the destination of a SET. + 2003-06-13 Doug Evans <dje@sebabeach.org> * tsystem.h (abort): Declare in inhibit_libc case to remove build diff --git a/gcc/combine.c b/gcc/combine.c index 3e2f089bed9..16385767e66 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -6139,30 +6139,35 @@ make_extraction (enum machine_mode mode, rtx inner, HOST_WIDE_INT pos, } else if (GET_CODE (inner) == REG) { - /* We can't call gen_lowpart_for_combine here since we always want - a SUBREG and it would sometimes return a new hard register. */ if (tmode != inner_mode) { - HOST_WIDE_INT final_word = pos / BITS_PER_WORD; - - if (WORDS_BIG_ENDIAN - && GET_MODE_SIZE (inner_mode) > UNITS_PER_WORD) - final_word = ((GET_MODE_SIZE (inner_mode) - - GET_MODE_SIZE (tmode)) - / UNITS_PER_WORD) - final_word; - - final_word *= UNITS_PER_WORD; - if (BYTES_BIG_ENDIAN && - GET_MODE_SIZE (inner_mode) > GET_MODE_SIZE (tmode)) - final_word += (GET_MODE_SIZE (inner_mode) - - GET_MODE_SIZE (tmode)) % UNITS_PER_WORD; - - /* Avoid creating invalid subregs, for example when - simplifying (x>>32)&255. */ - if (final_word >= GET_MODE_SIZE (inner_mode)) - return NULL_RTX; - - new = gen_rtx_SUBREG (tmode, inner, final_word); + if (in_dest) + { + /* We can't call gen_lowpart_for_combine here since we always want + a SUBREG and it would sometimes return a new hard register. */ + HOST_WIDE_INT final_word = pos / BITS_PER_WORD; + + if (WORDS_BIG_ENDIAN + && GET_MODE_SIZE (inner_mode) > UNITS_PER_WORD) + final_word = ((GET_MODE_SIZE (inner_mode) + - GET_MODE_SIZE (tmode)) + / UNITS_PER_WORD) - final_word; + + final_word *= UNITS_PER_WORD; + if (BYTES_BIG_ENDIAN && + GET_MODE_SIZE (inner_mode) > GET_MODE_SIZE (tmode)) + final_word += (GET_MODE_SIZE (inner_mode) + - GET_MODE_SIZE (tmode)) % UNITS_PER_WORD; + + /* Avoid creating invalid subregs, for example when + simplifying (x>>32)&255. */ + if (final_word >= GET_MODE_SIZE (inner_mode)) + return NULL_RTX; + + new = gen_rtx_SUBREG (tmode, inner, final_word); + } + else + new = gen_lowpart_for_combine (tmode, inner); } else new = inner; |