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| author | Richard Kenner <kenner@gcc.gnu.org> | 1996-03-22 09:11:37 -0500 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1996-03-22 09:11:37 -0500 |
| commit | c7b1ed2b88ec0e8079c07ce759c73b83ded3b41c (patch) | |
| tree | cdf04df88173348b8dc41cbb84125e2ecba605b3 /gcc/local-alloc.c | |
| parent | 55e442880910dbb1be014c09f2d84f0fb48d27c4 (diff) | |
| download | gcc-c7b1ed2b88ec0e8079c07ce759c73b83ded3b41c.zip gcc-c7b1ed2b88ec0e8079c07ce759c73b83ded3b41c.tar.gz gcc-c7b1ed2b88ec0e8079c07ce759c73b83ded3b41c.tar.bz2 | |
(optimize_reg_copy_1): Only update reg_live_length if it is
non-negative.
From-SVN: r11596
Diffstat (limited to 'gcc/local-alloc.c')
| -rw-r--r-- | gcc/local-alloc.c | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/gcc/local-alloc.c b/gcc/local-alloc.c index c36aca8..bde83b2 100644 --- a/gcc/local-alloc.c +++ b/gcc/local-alloc.c @@ -818,18 +818,24 @@ optimize_reg_copy_1 (insn, dest, src) { if (sregno >= FIRST_PSEUDO_REGISTER) { - reg_live_length[sregno] -= length; - /* reg_live_length is only an approximation after combine - if sched is not run, so make sure that we still have - a reasonable value. */ - if (reg_live_length[sregno] < 2) - reg_live_length[sregno] = 2; + if (reg_live_length[sregno] >= 0) + { + reg_live_length[sregno] -= length; + /* reg_live_length is only an approximation after + combine if sched is not run, so make sure that we + still have a reasonable value. */ + if (reg_live_length[sregno] < 2) + reg_live_length[sregno] = 2; + } + reg_n_calls_crossed[sregno] -= n_calls; } if (dregno >= FIRST_PSEUDO_REGISTER) { - reg_live_length[dregno] += d_length; + if (reg_live_length[dregno] >= 0) + reg_live_length[dregno] += d_length; + reg_n_calls_crossed[dregno] += d_n_calls; } |