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| author | Jeffrey A Law <law@cygnus.com> | 1998-08-18 09:34:59 +0000 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 1998-08-18 03:34:59 -0600 |
| commit | 7b31b7d9bd976765848cdc282e0ea7e2617bb35b (patch) | |
| tree | 3180812977ebe9db41f77114aa9ba5f1aebc0be6 /gcc | |
| parent | 5a5325cb7288ba6ee85682f079aebc26131cceba (diff) | |
| download | gcc-7b31b7d9bd976765848cdc282e0ea7e2617bb35b.zip gcc-7b31b7d9bd976765848cdc282e0ea7e2617bb35b.tar.gz gcc-7b31b7d9bd976765848cdc282e0ea7e2617bb35b.tar.bz2 | |
regmove.c (optimize_reg_copy_1): Update REG_N_CALLS_CROSSED and REG_LIVE_LENGTH as successful substitutions are made.
* regmove.c (optimize_reg_copy_1): Update REG_N_CALLS_CROSSED
and REG_LIVE_LENGTH as successful substitutions are made.
From-SVN: r21819
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/regmove.c | 41 |
2 files changed, 42 insertions, 4 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index d1c7cff..624be89 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +Tue Aug 18 10:33:30 1998 Jeffrey A Law (law@cygnus.com) + + * regmove.c (optimize_reg_copy_1): Update REG_N_CALLS_CROSSED + and REG_LIVE_LENGTH as successful substitutions are made. + Tue Aug 18 07:15:27 1998 Kaveh R. Ghazi <ghazi@caip.rutgers.edu> * config/sparc/sparc.c (ultra_find_type): Add empty semicolon diff --git a/gcc/regmove.c b/gcc/regmove.c index def8c14..8786553 100644 --- a/gcc/regmove.c +++ b/gcc/regmove.c @@ -288,12 +288,45 @@ optimize_reg_copy_1 (insn, dest, src) PATTERN (q)))) { /* We assume that a register is used exactly once per - insn in the updates below. If this is not correct, - no great harm is done. */ + insn in the REG_N_REFS updates below. If this is not + correct, no great harm is done. + + + We do not undo this substitution if something later + fails. Therefore, we must update the other REG_N_* + counters now to keep them accurate. */ if (sregno >= FIRST_PSEUDO_REGISTER) - REG_N_REFS (sregno) -= loop_depth; + { + REG_N_REFS (sregno) -= loop_depth; + + 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_N_REFS (dregno) += loop_depth; + { + REG_N_REFS (dregno) += loop_depth; + + if (REG_LIVE_LENGTH (dregno) >= 0) + REG_LIVE_LENGTH (dregno) += d_length; + + REG_N_CALLS_CROSSED (dregno) += d_n_calls; + } + + /* We've done a substitution, clear the counters. */ + length = 0; + d_length = 0; + n_calls = 0; + d_n_calls = 0; } else { |