check that rdtsc is generated from readcyclecounter

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24431 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/X86/rdtsc.ll b/test/CodeGen/X86/rdtsc.ll
new file mode 100644 (file)
index 0000000..289224e
--- /dev/null
+++ b/test/CodeGen/X86/rdtsc.ll
@@ -0,0 +1,10 @@
+; RUN: llvm-as < %s | llc -march=x86 | grep rptsc
+
+declare ulong %llvm.readcyclecounter()
+
+void %foo() {
+entry:
+%tmp.1 = call ulong %llvm.readcyclecounter ()
+ret void
+}
+