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| author | J"orn Rennecke <amylaar@cygnus.co.uk> | 1998-04-24 13:03:42 +0000 |
|---|---|---|
| committer | Joern Rennecke <amylaar@gcc.gnu.org> | 1998-04-24 14:03:42 +0100 |
| commit | e89d3e6fafba3bb7bfcda0e4a0096aac80200c1d (patch) | |
| tree | 86b767a3086c0c9ae07f20c1dfdd8afe6fe95d6a /gcc | |
| parent | 36d86db060e77a32d2feed7267235949613cca64 (diff) | |
| download | gcc-e89d3e6fafba3bb7bfcda0e4a0096aac80200c1d.zip gcc-e89d3e6fafba3bb7bfcda0e4a0096aac80200c1d.tar.gz gcc-e89d3e6fafba3bb7bfcda0e4a0096aac80200c1d.tar.bz2 | |
cse.c (cse_set_around_loop): Don't do optimization when new pseudos are created.
* cse.c (cse_set_around_loop): Don't do optimization when
new pseudos are created.
From-SVN: r19404
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/cse.c | 21 |
2 files changed, 23 insertions, 3 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 85d4b24..c95f9d6 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +Fri Apr 24 20:55:47 1998 J"orn Rennecke <amylaar@cygnus.co.uk> + + * cse.c (cse_set_around_loop): Don't do optimization when + new pseudos are created. + Fri Apr 24 11:00:18 1998 Jeffrey A Law (law@cygnus.com) * dbxout.c (dbxout_type_fields): Use HOST_WIDE_INT_PRINT_DEC @@ -8018,9 +8018,24 @@ cse_set_around_loop (x, insn, loop_start) if (cse_check_loop_start_value && validate_change (insn, &SET_SRC (x), src_elt->exp, 0)) - emit_insn_after (gen_move_insn (src_elt->exp, - SET_DEST (set)), - p); + { + /* If this creates new pseudos, this is unsafe, + because the regno of new pseudo is unsuitable + to index into reg_qty when cse_insn processes + the new insn. Therefore, if a new pseudo was + created, discard this optimization. */ + int nregs = max_reg_num (); + rtx move + = gen_move_insn (src_elt->exp, SET_DEST (set)); + if (nregs != max_reg_num ()) + { + if (! validate_change (insn, &SET_SRC (x), + SET_SRC (set), 0)) + abort (); + } + else + emit_insn_after (move, p); + } break; } } |