Hook up 64-bit atomic load/store on x86-32. I plan to write more efficient implementations eventually.

llvm-svn: 138505

1 files changed, 19 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/X86/atomic-load-store-wide.ll b/llvm/test/CodeGen/X86/atomic-load-store-wide.ll
new file mode 100644
index 00000000000..227883e5592
--- /dev/null
+++ b/llvm/test/CodeGen/X86/atomic-load-store-wide.ll
@@ -0,0 +1,19 @@
+; RUN: llc < %s -march=x86 | FileCheck %s
+
+; 64-bit load/store on x86-32
+; FIXME: The generated code can be substantially improved.
+
+define void @test1(i64* %ptr, i64 %val1) {
+; CHECK: test1
+; CHECK: cmpxchg8b
+; CHECK-NEXT: jne
+  store atomic i64 %val1, i64* %ptr seq_cst, align 4
+  ret void
+}
+
+define i64 @test2(i64* %ptr) {
+; CHECK: test2
+; CHECK: cmpxchg8b
+  %val = load atomic i64* %ptr seq_cst, align 4
+  ret i64 %val
+}