diff options
Diffstat (limited to 'lib/Target/README.txt')
| -rw-r--r-- | lib/Target/README.txt | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/lib/Target/README.txt b/lib/Target/README.txt index bda764deff..f85914b61d 100644 --- a/lib/Target/README.txt +++ b/lib/Target/README.txt @@ -254,6 +254,20 @@ unsigned long reverse(unsigned v) { //===---------------------------------------------------------------------===// +[LOOP DELETION] + +We don't delete this output free loop, because trip count analysis doesn't +realize that it is finite (if it were infinite, it would be undefined). Not +having this blocks Loop Idiom from matching strlen and friends. + +void foo(char *C) { + int x = 0; + while (*C) + ++x,++C; +} + +//===---------------------------------------------------------------------===// + [LOOP RECOGNITION] These idioms should be recognized as popcount (see PR1488): |