summaryrefslogtreecommitdiffstats
path: root/test/CodeGen/X86/tail-threshold.ll
diff options
context:
space:
mode:
Diffstat (limited to 'test/CodeGen/X86/tail-threshold.ll')
-rw-r--r--test/CodeGen/X86/tail-threshold.ll44
1 files changed, 44 insertions, 0 deletions
diff --git a/test/CodeGen/X86/tail-threshold.ll b/test/CodeGen/X86/tail-threshold.ll
new file mode 100644
index 0000000..f2296a0
--- /dev/null
+++ b/test/CodeGen/X86/tail-threshold.ll
@@ -0,0 +1,44 @@
+; RUN: llc -mtriple=x86_64-pc-linux-gnu -tail-merge-threshold 2 < %s | FileCheck %s
+
+; Test that we still do some merging if a block has more than
+; tail-merge-threshold predecessors.
+
+; CHECK: callq bar
+; CHECK: callq bar
+; CHECK: callq bar
+; CHECK-NOT: callq
+
+declare void @bar()
+
+define void @foo(i32 %xxx) {
+entry:
+ switch i32 %xxx, label %bb4 [
+ i32 0, label %bb0
+ i32 1, label %bb1
+ i32 2, label %bb2
+ i32 3, label %bb3
+ ]
+
+bb0:
+ call void @bar()
+ br label %bb5
+
+bb1:
+ call void @bar()
+ br label %bb5
+
+bb2:
+ call void @bar()
+ br label %bb5
+
+bb3:
+ call void @bar()
+ br label %bb5
+
+bb4:
+ call void @bar()
+ br label %bb5
+
+bb5:
+ ret void
+}
OpenPOWER on IntegriCloud