diff options
| author | Steven Bosscher <steven@gcc.gnu.org> | 2012-12-03 23:28:42 +0000 |
|---|---|---|
| committer | Steven Bosscher <steven@gcc.gnu.org> | 2012-12-03 23:28:42 +0000 |
| commit | dca3da7afc6a458541490589f46e246069abfd94 (patch) | |
| tree | bfaf593b0f75e7bfa1d728800187ee60eb2311f0 /gcc/gcse.c | |
| parent | cef1bc586cda64402724873b0063d8c67e5a97ab (diff) | |
gcse.c (struct reg_use): Remove unused struct.
* gcse.c (struct reg_use): Remove unused struct.
(gcse_emit_move_after): Do not create REG_EQUAL notes that reference
the SET_DEST of the instruction the note would be attached to.
* cse.c (cse_main): Add the DF_NOTE problem.
From-SVN: r194108
Diffstat (limited to 'gcc/gcse.c')
| -rw-r--r-- | gcc/gcse.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/gcc/gcse.c b/gcc/gcse.c index ee45b6544f9..4a426a3528c 100644 --- a/gcc/gcse.c +++ b/gcc/gcse.c @@ -255,8 +255,6 @@ int flag_rerun_cse_after_global_opts; /* An obstack for our working variables. */ static struct obstack gcse_obstack; -struct reg_use {rtx reg_rtx; }; - /* Hash table of expressions. */ struct expr @@ -2491,23 +2489,27 @@ gcse_emit_move_after (rtx dest, rtx src, rtx insn) rtx new_rtx; rtx set = single_set (insn), set2; rtx note; - rtx eqv; + rtx eqv = NULL_RTX; /* This should never fail since we're creating a reg->reg copy we've verified to be valid. */ new_rtx = emit_insn_after (gen_move_insn (dest, src), insn); - /* Note the equivalence for local CSE pass. */ + /* Note the equivalence for local CSE pass. Take the note from the old + set if there was one. Otherwise record the SET_SRC from the old set + unless DEST is also an operand of the SET_SRC. */ set2 = single_set (new_rtx); if (!set2 || !rtx_equal_p (SET_DEST (set2), dest)) return new_rtx; if ((note = find_reg_equal_equiv_note (insn))) eqv = XEXP (note, 0); - else + else if (! REG_P (dest) + || ! reg_mentioned_p (dest, SET_SRC (set))) eqv = SET_SRC (set); - set_unique_reg_note (new_rtx, REG_EQUAL, copy_insn_1 (eqv)); + if (eqv != NULL_RTX) + set_unique_reg_note (new_rtx, REG_EQUAL, copy_insn_1 (eqv)); return new_rtx; } |