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| author | Zack Weinberg <zack@gcc.gnu.org> | 2002-12-16 18:23:00 +0000 |
|---|---|---|
| committer | Zack Weinberg <zack@gcc.gnu.org> | 2002-12-16 18:23:00 +0000 |
| commit | 4977bab6ed59f01c73f9c8b9e92298706df9b6d5 (patch) | |
| tree | c259697c448b0c6f548f153c48c46a8d7a75970f /gcc/basic-block.h | |
| parent | b51dc045004ee7eb8d2bf4358ddf22a6cc6c1d00 (diff) | |
| download | gcc-4977bab6ed59f01c73f9c8b9e92298706df9b6d5.zip gcc-4977bab6ed59f01c73f9c8b9e92298706df9b6d5.tar.gz gcc-4977bab6ed59f01c73f9c8b9e92298706df9b6d5.tar.bz2 | |
Merge basic-improvements-branch to trunk
From-SVN: r60174
Diffstat (limited to 'gcc/basic-block.h')
| -rw-r--r-- | gcc/basic-block.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/gcc/basic-block.h b/gcc/basic-block.h index 10c8954..a72b9b9 100644 --- a/gcc/basic-block.h +++ b/gcc/basic-block.h @@ -112,7 +112,11 @@ do { \ be done, other than zero the statistics on the first allocation. */ #define MAX_REGNO_REG_SET(NUM_REGS, NEW_P, RENUMBER_P) -/* Type we use to hold basic block counters. Should be at least 64bit. */ +/* Type we use to hold basic block counters. Should be at least + 64bit. Although a counter cannot be negative, we use a signed + type, because erroneous negative counts can be generated when the + flow graph is manipulated by various optimizations. A signed type + makes those easy to detect. */ typedef HOST_WIDEST_INT gcov_type; /* Control flow edge information. */ |