diff options
| author | Chris Lattner <sabre@nondot.org> | 2010-01-10 02:22:12 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2010-01-10 02:22:12 +0000 |
| commit | d26c9e183e56d09f48d7074be4cacce099338316 (patch) | |
| tree | b46bcf64ab43a254e8a455e9c8b09eb570cf5951 /test/Transforms/InstCombine/cast.ll | |
| parent | 3f7dc880c4b558655cb8868ce29e1d2b27e2ea51 (diff) | |
| download | llvm-d26c9e183e56d09f48d7074be4cacce099338316.tar.gz llvm-d26c9e183e56d09f48d7074be4cacce099338316.tar.bz2 llvm-d26c9e183e56d09f48d7074be4cacce099338316.tar.xz | |
enhance CanEvaluateZExtd to handle shift left and sext, allowing
more expressions to be promoted and casts eliminated.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93096 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/InstCombine/cast.ll')
| -rw-r--r-- | test/Transforms/InstCombine/cast.ll | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/cast.ll b/test/Transforms/InstCombine/cast.ll index b6dc4642b8..490df8fab6 100644 --- a/test/Transforms/InstCombine/cast.ll +++ b/test/Transforms/InstCombine/cast.ll @@ -403,3 +403,31 @@ define i64 @test44(i8 %T) { ; CHECK-NEXT: %B = or i64 %A, 1234 ; CHECK-NEXT: ret i64 %B } + +define i64 @test45(i8 %A, i64 %Q) { + %D = trunc i64 %Q to i32 ;; should be removed + %B = sext i8 %A to i32 + %C = or i32 %B, %D + %E = zext i32 %C to i64 + ret i64 %E +; CHECK: @test45 +; CHECK-NEXT: %B = sext i8 %A to i64 +; CHECK-NEXT: %C = or i64 %B, %Q +; CHECK-NEXT: %E = and i64 %C, 4294967295 +; CHECK-NEXT: ret i64 %E +} + + +define i64 @test46(i64 %A) { + %B = trunc i64 %A to i32 + %C = and i32 %B, 42 + %D = shl i32 %C, 8 + %E = zext i32 %D to i64 + ret i64 %E +; CHECK: @test46 +; CHECK-NEXT: %C = shl i64 %A, 8 +; CHECK-NEXT: %D = and i64 %C, 10752 +; CHECK-NEXT: ret i64 %D +} + + |