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| author | John Wehle <john@feith.com> | 2001-04-13 04:10:56 +0000 |
|---|---|---|
| committer | John Wehle <wehle@gcc.gnu.org> | 2001-04-13 04:10:56 +0000 |
| commit | 35bb0780fcaf96e18159da57c2d77393d1aeb7eb (patch) | |
| tree | 6c074d7a000673d864424a17e5abaabb72a7bdce /gcc | |
| parent | 1a5428f737b19b58f505bec4e774ff93df40683d (diff) | |
| download | gcc-35bb0780fcaf96e18159da57c2d77393d1aeb7eb.zip gcc-35bb0780fcaf96e18159da57c2d77393d1aeb7eb.tar.gz gcc-35bb0780fcaf96e18159da57c2d77393d1aeb7eb.tar.bz2 | |
jump.c (jump_optimize_1): Don't delete dead stores here.
* jump.c (jump_optimize_1): Don't delete dead stores here.
* toplev.c (rest_of_compilation): Call delete_trivially_dead_insns
prior to running jump optimize before cse2.
From-SVN: r41320
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/jump.c | 29 | ||||
| -rw-r--r-- | gcc/toplev.c | 6 |
3 files changed, 12 insertions, 29 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index f079d10..4f431b6 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +Fri Apr 13 00:09:22 EDT 2001 John Wehle (john@feith.com) + + * jump.c (jump_optimize_1): Don't delete dead stores here. + * toplev.c (rest_of_compilation): Call delete_trivially_dead_insns + prior to running jump optimize before cse2. + 2001-04-12 Stan Shebs <shebs@apple.com> * objc/objc-act.c: Remove all code ifdefed with the never-used @@ -248,35 +248,6 @@ jump_optimize_1 (f, cross_jump, noop_moves, after_regscan, if (noop_moves) delete_noop_moves (f); - /* If we haven't yet gotten to reload and we have just run regscan, - delete any insn that sets a register that isn't used elsewhere. - This helps some of the optimizations below by having less insns - being jumped around. */ - - if (optimize && ! reload_completed && after_regscan) - for (insn = f; insn; insn = next) - { - rtx set = single_set (insn); - - next = NEXT_INSN (insn); - - if (set && GET_CODE (SET_DEST (set)) == REG - && REGNO (SET_DEST (set)) >= FIRST_PSEUDO_REGISTER - && REGNO_FIRST_UID (REGNO (SET_DEST (set))) == INSN_UID (insn) - /* We use regno_last_note_uid so as not to delete the setting - of a reg that's used in notes. A subsequent optimization - might arrange to use that reg for real. */ - && REGNO_LAST_NOTE_UID (REGNO (SET_DEST (set))) == INSN_UID (insn) - && ! side_effects_p (SET_SRC (set)) - && ! find_reg_note (insn, REG_RETVAL, 0) - /* An ADDRESSOF expression can turn into a use of the internal arg - pointer, so do not delete the initialization of the internal - arg pointer yet. If it is truly dead, flow will delete the - initializing insn. */ - && SET_DEST (set) != current_function_internal_arg_pointer) - delete_insn (insn); - } - /* Now iterate optimizing jumps until nothing changes over one pass. */ changed = 1; old_max_reg = max_reg_num (); diff --git a/gcc/toplev.c b/gcc/toplev.c index 043c0b6..ae4de0e 100644 --- a/gcc/toplev.c +++ b/gcc/toplev.c @@ -3224,6 +3224,12 @@ rest_of_compilation (decl) ??? Rework to not call reg_scan so often. */ timevar_push (TV_JUMP); + /* The previous call to loop_optimize makes some instructions + trivially dead. We delete those instructions now in the + hope that doing so will make the heuristics in jump work + better and possibly speed up compilation. */ + delete_trivially_dead_insns (insns, max_reg_num ()); + reg_scan (insns, max_reg_num (), 0); jump_optimize (insns, !JUMP_CROSS_JUMP, !JUMP_NOOP_MOVES, JUMP_AFTER_REGSCAN); |