diff options
Diffstat (limited to 'llvm/test')
| -rw-r--r-- | llvm/test/Analysis/LoopAccessAnalysis/number-of-memchecks.ll | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/llvm/test/Analysis/LoopAccessAnalysis/number-of-memchecks.ll b/llvm/test/Analysis/LoopAccessAnalysis/number-of-memchecks.ll index ab9abd7c60a..01b3eda3e12 100644 --- a/llvm/test/Analysis/LoopAccessAnalysis/number-of-memchecks.ll +++ b/llvm/test/Analysis/LoopAccessAnalysis/number-of-memchecks.ll @@ -217,8 +217,9 @@ for.end: ; preds = %for.body ret void } -; Don't merge pointers if there is some other check which could be falsely -; invalidated. For example, in the following loop: +; Don't merge pointers if we need to perform a check against a pointer +; to the same underlying object (doing so would emit a check that could be +; falsely invalidated) For example, in the following loop: ; ; for (i = 0; i < 5000; ++i) ; a[i + offset] = a[i] + a[i + 10000] @@ -226,6 +227,10 @@ for.end: ; preds = %for.body ; we should not merge the intervals associated with the reads (0,5000) and ; (10000, 15000) into (0, 15000) as this will pottentially fail the check ; against the interval associated with the write. +; +; We cannot have this check unless ShouldRetryWithRuntimeCheck is set, +; and therefore the grouping algorithm would create a separate group for +; each pointer. ; CHECK: function 'testi': ; CHECK: Run-time memory checks: |
