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| author | Eric Botcazou <ebotcazou@libertysurf.fr> | 2002-12-19 21:47:12 +0100 |
|---|---|---|
| committer | Eric Botcazou <ebotcazou@gcc.gnu.org> | 2002-12-19 20:47:12 +0000 |
| commit | 039baf9e878ff41bafecf6e56f5e8a6517f2550d (patch) | |
| tree | 470043d1de55a51cee45090944a3b15b2bdddf2b /gcc/loop.c | |
| parent | ee8acf894eb94eaf79f1c8a5550c44cb1a76a595 (diff) | |
| download | gcc-039baf9e878ff41bafecf6e56f5e8a6517f2550d.zip gcc-039baf9e878ff41bafecf6e56f5e8a6517f2550d.tar.gz gcc-039baf9e878ff41bafecf6e56f5e8a6517f2550d.tar.bz2 | |
re PR rtl-optimization/8988 (gcc3.2 and 3.2.1 with -O2 and -mcpu=i386 generates code that segfaults)
PR optimization/8988
* loop.c (maybe_eliminate_biv): Kill REG_EQUAL notes mentioning
the biv when eliminating.
From-SVN: r60334
Diffstat (limited to 'gcc/loop.c')
| -rw-r--r-- | gcc/loop.c | 11 |
1 files changed, 10 insertions, 1 deletions
@@ -8612,11 +8612,12 @@ maybe_eliminate_biv (loop, bl, eliminate_p, threshold, insn_count) enum rtx_code code = GET_CODE (p); basic_block where_bb = 0; rtx where_insn = threshold >= insn_count ? 0 : p; + rtx note; /* If this is a libcall that sets a giv, skip ahead to its end. */ if (GET_RTX_CLASS (code) == 'i') { - rtx note = find_reg_note (p, REG_LIBCALL, NULL_RTX); + note = find_reg_note (p, REG_LIBCALL, NULL_RTX); if (note) { @@ -8634,6 +8635,8 @@ maybe_eliminate_biv (loop, bl, eliminate_p, threshold, insn_count) } } } + + /* Closely examine the insn if the biv is mentioned. */ if ((code == INSN || code == JUMP_INSN || code == CALL_INSN) && reg_mentioned_p (reg, PATTERN (p)) && ! maybe_eliminate_biv_1 (loop, PATTERN (p), p, bl, @@ -8645,6 +8648,12 @@ maybe_eliminate_biv (loop, bl, eliminate_p, threshold, insn_count) bl->regno, INSN_UID (p)); break; } + + /* If we are eliminating, kill REG_EQUAL notes mentioning the biv. */ + if (eliminate_p + && (note = find_reg_note (p, REG_EQUAL, NULL_RTX)) != NULL_RTX + && reg_mentioned_p (reg, XEXP (note, 0))) + remove_note (p, note); } if (p == loop->end) |