diff options
| author | Stephen Hines <srhines@google.com> | 2014-12-01 14:51:49 -0800 |
|---|---|---|
| committer | Stephen Hines <srhines@google.com> | 2014-12-02 16:08:10 -0800 |
| commit | 37ed9c199ca639565f6ce88105f9e39e898d82d0 (patch) | |
| tree | 8fb36d3910e3ee4c4e1b7422f4f017108efc52f5 /test/CodeGen/X86/stackmap-shadow-optimization.ll | |
| parent | d2327b22152ced7bc46dc629fc908959e8a52d03 (diff) | |
| download | external_llvm-37ed9c199ca639565f6ce88105f9e39e898d82d0.zip external_llvm-37ed9c199ca639565f6ce88105f9e39e898d82d0.tar.gz external_llvm-37ed9c199ca639565f6ce88105f9e39e898d82d0.tar.bz2 | |
Update aosp/master LLVM for rebase to r222494.
Change-Id: Ic787f5e0124df789bd26f3f24680f45e678eef2d
Diffstat (limited to 'test/CodeGen/X86/stackmap-shadow-optimization.ll')
| -rw-r--r-- | test/CodeGen/X86/stackmap-shadow-optimization.ll | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/test/CodeGen/X86/stackmap-shadow-optimization.ll b/test/CodeGen/X86/stackmap-shadow-optimization.ll new file mode 100644 index 0000000..a3725f2 --- /dev/null +++ b/test/CodeGen/X86/stackmap-shadow-optimization.ll @@ -0,0 +1,28 @@ +; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=corei7 | FileCheck %s + +; Check that the X86 stackmap shadow optimization is only outputting a 3-byte +; nop here. 8-bytes are requested, but 5 are covered by the code for the call to +; bar. However, the frame teardown and the return do not count towards the +; stackmap shadow as the call return counts as a branch target so must flush +; the shadow. +; Note that in order for a thread to not return in to the patched space +; the call must be at the end of the shadow, so the required nop must be +; before the call, not after. +define void @shadow_optimization_test() { +entry: +; CHECK-LABEL: shadow_optimization_test: +; CHECK: callq _bar +; CHECK: nop +; CHECK: callq _bar +; CHECK-NOT: nop +; CHECK: callq _bar +; CHECK-NOT: nop + call void @bar() + tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 0, i32 8) + call void @bar() + call void @bar() + ret void +} + +declare void @llvm.experimental.stackmap(i64, i32, ...) +declare void @bar() |