diff options
author | Nick Lewycky <nicholas@mxc.ca> | 2009-10-13 07:03:23 +0000 |
---|---|---|
committer | Nick Lewycky <nicholas@mxc.ca> | 2009-10-13 07:03:23 +0000 |
commit | cc271861da5d9487cbcbb44f949b411a12ec0d96 (patch) | |
tree | bde823e5a82bf9e41b1b46edd7624be10ccf8739 /test/Feature | |
parent | 6e4bdfc229cbbe5ba549e45f55bda4bb989b159d (diff) | |
download | external_llvm-cc271861da5d9487cbcbb44f949b411a12ec0d96.zip external_llvm-cc271861da5d9487cbcbb44f949b411a12ec0d96.tar.gz external_llvm-cc271861da5d9487cbcbb44f949b411a12ec0d96.tar.bz2 |
Add new "memory use marker" intrinsics. These indicate lifetimes and invariant
sections of memory objects.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83953 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Feature')
-rw-r--r-- | test/Feature/memorymarkers.ll | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/test/Feature/memorymarkers.ll b/test/Feature/memorymarkers.ll new file mode 100644 index 0000000..06b8376 --- /dev/null +++ b/test/Feature/memorymarkers.ll @@ -0,0 +1,36 @@ +; RUN: llvm-as -disable-output < %s + +%"struct.std::pair<int,int>" = type { i32, i32 } + +declare void @_Z3barRKi(i32*) + +declare void @llvm.lifetime.start(i64, i8* nocapture) nounwind +declare void @llvm.lifetime.end(i64, i8* nocapture) nounwind +declare {}* @llvm.invariant.start(i64, i8* nocapture) readonly nounwind +declare void @llvm.invariant.end({}*, i64, i8* nocapture) nounwind + +define i32 @_Z4foo2v() nounwind { +entry: + %x = alloca %"struct.std::pair<int,int>" + %y = bitcast %"struct.std::pair<int,int>"* %x to i8* + + ;; Constructor starts here (this isn't needed since it is immediately + ;; preceded by an alloca, but shown for completeness). + call void @llvm.lifetime.start(i64 8, i8* %y) + + %0 = getelementptr %"struct.std::pair<int,int>"* %x, i32 0, i32 0 + store i32 4, i32* %0, align 8 + %1 = getelementptr %"struct.std::pair<int,int>"* %x, i32 0, i32 1 + store i32 5, i32* %1, align 4 + + ;; Constructor has finished here. + %inv = call {}* @llvm.invariant.start(i64 8, i8* %y) + call void @_Z3barRKi(i32* %0) nounwind + %2 = load i32* %0, align 8 + + ;; Destructor is run here. + call void @llvm.invariant.end({}* %inv, i64 8, i8* %y) + ;; Destructor is done here. + call void @llvm.lifetime.end(i64 8, i8* %y) + ret i32 %2 +} |