Implement ctlz and cttz with bsr and bsf.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45024 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/X86/clz.ll b/test/CodeGen/X86/clz.ll
new file mode 100644
index 0000000..0505529
--- /dev/null
+++ b/test/CodeGen/X86/clz.ll
@@ -0,0 +1,16 @@
+; RUN: llvm-as < %s | llc -march=x86 | grep bsr
+; RUN: llvm-as < %s | llc -march=x86 | grep bsf
+
+define i32 @t1(i32 %x) nounwind {
+ %tmp = tail call i32 @llvm.ctlz.i32( i32 %x )
+ ret i32 %tmp
+}
+
+declare i32 @llvm.ctlz.i32(i32) nounwind readnone
+
+define i32 @t2(i32 %x) nounwind {
+ %tmp = tail call i32 @llvm.cttz.i32( i32 %x )
+ ret i32 %tmp
+}
+
+declare i32 @llvm.cttz.i32(i32) nounwind readnone