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| author | Nick Lewycky <nicholas@mxc.ca> | 2012-02-17 06:59:21 +0000 |
|---|---|---|
| committer | Nick Lewycky <nicholas@mxc.ca> | 2012-02-17 06:59:21 +0000 |
| commit | 81266c5c9358d71331886a98e750ac9409cc640c (patch) | |
| tree | 70d61056257c6a311e8353773fef542a13adf21f /test/Transforms/GlobalOpt | |
| parent | 38bdc5762f58b64d652864d154bf1b4dffb5ed39 (diff) | |
| download | external_llvm-81266c5c9358d71331886a98e750ac9409cc640c.zip external_llvm-81266c5c9358d71331886a98e750ac9409cc640c.tar.gz external_llvm-81266c5c9358d71331886a98e750ac9409cc640c.tar.bz2 | |
Add support for invariant.start inside the static constructor evaluator. This is
useful to represent a variable that is const in the source but can't be constant
in the IR because of a non-trivial constructor. If globalopt evaluates the
constructor, and there was an invariant.start with no matching invariant.end
possible, it will mark the global constant afterwards.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150794 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/GlobalOpt')
| -rw-r--r-- | test/Transforms/GlobalOpt/invariant.ll | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/test/Transforms/GlobalOpt/invariant.ll b/test/Transforms/GlobalOpt/invariant.ll new file mode 100644 index 0000000..2662d60 --- /dev/null +++ b/test/Transforms/GlobalOpt/invariant.ll @@ -0,0 +1,34 @@ +; RUN: opt -globalopt -S -o - < %s | FileCheck %s + +declare {}* @llvm.invariant.start(i64 %size, i8* nocapture %ptr) + +define void @test1(i8* %ptr) { + call {}* @llvm.invariant.start(i64 -1, i8* %ptr) + ret void +} + +@object1 = global i32 0 +; CHECK: @object1 = constant i32 -1 +define void @ctor1() { + store i32 -1, i32* @object1 + %A = bitcast i32* @object1 to i8* + call void @test1(i8* %A) + ret void +} + + +@object2 = global i32 0 +; CHECK: @object2 = global i32 0 +define void @ctor2() { + store i32 -1, i32* @object2 + %A = bitcast i32* @object2 to i8* + %B = call {}* @llvm.invariant.start(i64 -1, i8* %A) + ; Why in the world does this pass the verifier? + %C = bitcast {}* %B to i8* + ret void +} + +@llvm.global_ctors = appending constant + [2 x { i32, void ()* }] + [ { i32, void ()* } { i32 65535, void ()* @ctor1 }, + { i32, void ()* } { i32 65535, void ()* @ctor2 } ] |