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Diffstat (limited to 'lib/Analysis/README.txt')
| -rw-r--r-- | lib/Analysis/README.txt | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/lib/Analysis/README.txt b/lib/Analysis/README.txt index c401090..88ea9f1 100644 --- a/lib/Analysis/README.txt +++ b/lib/Analysis/README.txt @@ -16,3 +16,15 @@ In addition to being much more complicated, it involves i65 arithmetic, which is very inefficient when expanded into code. //===---------------------------------------------------------------------===// + +In test/CodeGen/X86/lsr-delayed-fold.ll, + +ScalarEvolution is forming this expression: + +((trunc i64 (-1 * %arg5) to i32) + (trunc i64 %arg5 to i32) + (-1 * (trunc i64 undef to i32))) + +This could be folded to + +(-1 * (trunc i64 undef to i32)) + +//===---------------------------------------------------------------------===// |