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| author | Nadav Rotem <nrotem@apple.com> | 2012-08-14 05:19:07 +0000 |
|---|---|---|
| committer | Nadav Rotem <nrotem@apple.com> | 2012-08-14 05:19:07 +0000 |
| commit | 3e883734fab4da8413f16957dd116d4ffd9d3223 (patch) | |
| tree | 3165c1b0a62a477da5ca386e10ee5dc97d752da3 /test/Transforms/CodeGenPrepare | |
| parent | 443c9ed7688e66c55c43819a75be681574b291de (diff) | |
| download | llvm-3e883734fab4da8413f16957dd116d4ffd9d3223.tar.gz llvm-3e883734fab4da8413f16957dd116d4ffd9d3223.tar.bz2 llvm-3e883734fab4da8413f16957dd116d4ffd9d3223.tar.xz | |
During the CodeGenPrepare we often lower intrinsics (such as objsize)
and allow some optimizations to turn conditional branches into unconditional.
This commit adds a simple control-flow optimization which merges two consecutive
basic blocks which are connected by a single edge. This allows the codegen to
operate on larger basic blocks.
rdar://11973998
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161852 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/CodeGenPrepare')
| -rw-r--r-- | test/Transforms/CodeGenPrepare/basic.ll | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/test/Transforms/CodeGenPrepare/basic.ll b/test/Transforms/CodeGenPrepare/basic.ll index ebf10f0e9d..c68e77eb55 100644 --- a/test/Transforms/CodeGenPrepare/basic.ll +++ b/test/Transforms/CodeGenPrepare/basic.ll @@ -5,7 +5,7 @@ target triple = "x86_64-apple-darwin10.0.0" ; CHECK: @test1 ; objectsize should fold to a constant, which causes the branch to fold to an -; uncond branch. +; uncond branch. Next, we fold the control flow alltogether. ; rdar://8785296 define i32 @test1(i8* %ptr) nounwind ssp noredzone align 2 { entry: @@ -13,8 +13,8 @@ entry: %1 = icmp ugt i64 %0, 3 br i1 %1, label %T, label %trap -; CHECK: entry: -; CHECK-NEXT: br label %T +; CHECK: T: +; CHECK-NOT: br label % trap: ; preds = %0, %entry tail call void @llvm.trap() noreturn nounwind |