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| author | Evgeniy Stepanov <eugeni.stepanov@gmail.com> | 2016-08-02 23:21:30 +0000 |
|---|---|---|
| committer | Evgeniy Stepanov <eugeni.stepanov@gmail.com> | 2016-08-02 23:21:30 +0000 |
| commit | d99f80b48e1f3502357e21d071531432be333b8e (patch) | |
| tree | b7858ff8897d3b754b433c3e91e3c448fe9751ad /llvm/test | |
| parent | 39bf39f35c208109f6d5907708ee53dee2878bed (diff) | |
| download | bcm5719-llvm-d99f80b48e1f3502357e21d071531432be333b8e.tar.gz bcm5719-llvm-d99f80b48e1f3502357e21d071531432be333b8e.zip | |
[safestack] Layout large allocas first to reduce fragmentation.
llvm-svn: 277544
Diffstat (limited to 'llvm/test')
| -rw-r--r-- | llvm/test/Transforms/SafeStack/layout-frag.ll | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/llvm/test/Transforms/SafeStack/layout-frag.ll b/llvm/test/Transforms/SafeStack/layout-frag.ll new file mode 100644 index 00000000000..125eb0f8be9 --- /dev/null +++ b/llvm/test/Transforms/SafeStack/layout-frag.ll @@ -0,0 +1,39 @@ +; Test that safestack layout reuses a region w/o fragmentation. +; RUN: opt -safe-stack -S -mtriple=x86_64-pc-linux-gnu < %s -o - | FileCheck %s + +define void @f() safestack { +; CHECK-LABEL: define void @f +entry: +; CHECK: %[[USP:.*]] = load i8*, i8** @__safestack_unsafe_stack_ptr +; CHECK: getelementptr i8, i8* %[[USP]], i32 -16 + + %x0 = alloca i64, align 8 + %x1 = alloca i8, align 1 + %x2 = alloca i64, align 8 + + %x0a = bitcast i64* %x0 to i8* + %x2a = bitcast i64* %x2 to i8* + + call void @llvm.lifetime.start(i64 4, i8* %x0a) + call void @capture64(i64* %x0) + call void @llvm.lifetime.end(i64 4, i8* %x0a) + + call void @llvm.lifetime.start(i64 4, i8* %x1) + call void @llvm.lifetime.start(i64 4, i8* %x2a) + call void @capture8(i8* %x1) + call void @capture64(i64* %x2) + call void @llvm.lifetime.end(i64 4, i8* %x1) + call void @llvm.lifetime.end(i64 4, i8* %x2a) + +; Test that i64 allocas share space. +; CHECK: getelementptr i8, i8* %unsafe_stack_ptr, i32 -8 +; CHECK: getelementptr i8, i8* %unsafe_stack_ptr, i32 -9 +; CHECK: getelementptr i8, i8* %unsafe_stack_ptr, i32 -8 + + ret void +} + +declare void @llvm.lifetime.start(i64, i8* nocapture) +declare void @llvm.lifetime.end(i64, i8* nocapture) +declare void @capture8(i8*) +declare void @capture64(i64*) |
