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| -rw-r--r-- | gcc/ChangeLog | 3 | ||||
| -rw-r--r-- | gcc/regclass.c | 12 |
2 files changed, 11 insertions, 4 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 8998871..fe4c381 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,8 @@ Tue Jan 4 00:18:46 2000 Jeffrey A Law (law@cygnus.com) + * regclass.c (regclass): Properly compute loop_cost. Adjust + comments. + * regclass.c: Fix minor whitespace problems. 2000-01-03 Anthony Green <green@cygnus.com> diff --git a/gcc/regclass.c b/gcc/regclass.c index d25af73..667250c 100644 --- a/gcc/regclass.c +++ b/gcc/regclass.c @@ -1100,13 +1100,17 @@ regclass (f, nregs, dump) basic_block bb = BASIC_BLOCK (index); /* Show that an insn inside a loop is likely to be executed three - times more than insns outside a loop. This is much more aggressive - than the assumptions made elsewhere and is being tried as an - experiment. */ + times more than insns outside a loop. This is much more + aggressive than the assumptions made elsewhere and is being + tried as an experiment. + + Note that a block's loop depth starts at zero, not one! We + must not subract one from the loop depth as that could give + a negative shift count below. */ if (optimize_size) loop_cost = 1; else - loop_cost = 1 << (2 * MIN (bb->loop_depth - 1, 5)); + loop_cost = 1 << (2 * MIN (bb->loop_depth, 5)); for (insn = bb->head; ; insn = NEXT_INSN (insn)) { insn = scan_one_insn (insn, pass); |