diff options
| author | Duncan Sands <baldrick@free.fr> | 2011-10-28 19:01:20 +0000 |
|---|---|---|
| committer | Duncan Sands <baldrick@free.fr> | 2011-10-28 19:01:20 +0000 |
| commit | 012f8547f70c7cefe552282f28581a434ebe7324 (patch) | |
| tree | a5bd039d949ceecf225351d88d4b3ba0f54fc72f /test/Transforms | |
| parent | 2ec69faf2615ccdffffacff9033b2228c589971c (diff) | |
| download | llvm-012f8547f70c7cefe552282f28581a434ebe7324.tar.gz llvm-012f8547f70c7cefe552282f28581a434ebe7324.tar.bz2 llvm-012f8547f70c7cefe552282f28581a434ebe7324.tar.xz | |
The expression icmp eq (select (icmp eq x, 0), 1, x), 0 folds to false.
Spotted by my super-optimizer in 186.crafty and 450.soplex. We really
need a proper infrastructure for handling generalizations of this kind
of thing (which occur a lot), however this case is so simple that I decided
to go ahead and implement it directly.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143214 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms')
| -rw-r--r-- | test/Transforms/InstSimplify/compare.ll | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/test/Transforms/InstSimplify/compare.ll b/test/Transforms/InstSimplify/compare.ll index 57727c9ab7..df33122574 100644 --- a/test/Transforms/InstSimplify/compare.ll +++ b/test/Transforms/InstSimplify/compare.ll @@ -204,6 +204,15 @@ define i1 @select4(i1 %cond) { ; CHECK: ret i1 %cond } +define i1 @select5(i32 %x) { +; CHECK: @select5 + %c = icmp eq i32 %x, 0 + %s = select i1 %c, i32 1, i32 %x + %c2 = icmp eq i32 %s, 0 + ret i1 %c2 +; CHECK: ret i1 false +} + define i1 @urem1(i32 %X, i32 %Y) { ; CHECK: @urem1 %A = urem i32 %X, %Y |