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| author | DJ Delorie <dj@redhat.com> | 2011-01-26 17:03:47 -0500 |
|---|---|---|
| committer | DJ Delorie <dj@gcc.gnu.org> | 2011-01-26 17:03:47 -0500 |
| commit | 5c2917ec9d9fe2e633d09b9401a23b0a9c47a23f (patch) | |
| tree | 0b4b6309cb2c8c5e4a75beb4bca4b4058e10e2f4 /gcc/combine.c | |
| parent | 81cce6f682ecac63e57d6b12514fd774808bc067 (diff) | |
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re PR rtl-optimization/46878 (V850 ICE in in maybe_add_or_update_dep_1, at sched-deps.c:854)
PR rtl-optimization/46878
* combine.c (insn_a_feeds_b): Check for the implicit cc0
setter/user dependency as well.
* gcc.dg/pr46878-1.c: New test.
From-SVN: r169307
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 3ee53e6..4fe71f3 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -1032,7 +1032,9 @@ clear_log_links (void) /* Walk the LOG_LINKS of insn B to see if we find a reference to A. Return true if we found a LOG_LINK that proves that A feeds B. This only works if there are no instructions between A and B which could have a link - depending on A, since in that case we would not record a link for B. */ + depending on A, since in that case we would not record a link for B. + We also check the implicit dependency created by a cc0 setter/user + pair. */ static bool insn_a_feeds_b (rtx a, rtx b) @@ -1041,6 +1043,10 @@ insn_a_feeds_b (rtx a, rtx b) for (links = LOG_LINKS (b); links; links = XEXP (links, 1)) if (XEXP (links, 0) == a) return true; +#ifdef HAVE_cc0 + if (sets_cc0_p (a)) + return true; +#endif return false; } |