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| author | Eric Botcazou <ebotcazou@multimania.com> | 2002-07-17 18:00:35 +0000 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 2002-07-17 11:00:35 -0700 |
| commit | f1a73cfecf88d38c1c917c93b60cb8b2e4d82960 (patch) | |
| tree | 350a578d0f7c7d1813548df578d08e605c0b1894 /gcc/loop.c | |
| parent | 90888283784269660b9143890d880642fd5becbf (diff) | |
| download | gcc-f1a73cfecf88d38c1c917c93b60cb8b2e4d82960.zip gcc-f1a73cfecf88d38c1c917c93b60cb8b2e4d82960.tar.gz gcc-f1a73cfecf88d38c1c917c93b60cb8b2e4d82960.tar.bz2 | |
re PR rtl-optimization/6713 (Regression wrt 3.0.4: g++ -O2 leads to seg fault at run time)
PR optimization/6713
* loop.c (loop_givs_rescan): Explicitly delete the insn that
sets a non-replaceable giv after issuing the new one.
Co-Authored-By: Glen Nakamura <glen@imodulo.com>
From-SVN: r55539
Diffstat (limited to 'gcc/loop.c')
| -rw-r--r-- | gcc/loop.c | 14 |
1 files changed, 12 insertions, 2 deletions
@@ -4874,10 +4874,20 @@ loop_givs_rescan (loop, bl, reg_map) } else { + rtx original_insn = v->insn; + /* Not replaceable; emit an insn to set the original giv reg from the reduced giv, same as above. */ - loop_insn_emit_after (loop, 0, v->insn, - gen_move_insn (v->dest_reg, v->new_reg)); + v->insn = loop_insn_emit_after (loop, 0, original_insn, + gen_move_insn (v->dest_reg, + v->new_reg)); + + /* The original insn may have a REG_EQUAL note. This note is + now incorrect and may result in invalid substitutions later. + We could just delete the note, but we know that the entire + insn is dead, so we might as well save ourselves the bother + and remove the whole thing. */ + delete_insn (original_insn); } /* When a loop is reversed, givs which depend on the reversed |