Add a flag to experiment with outlining optional branches.

[oota-llvm.git] / test / CodeGen / X86 / code_placement_outline_optional_branches.ll

diff --git a/test/CodeGen/X86/code_placement_outline_optional_branches.ll b/test/CodeGen/X86/code_placement_outline_optional_branches.ll
new file mode 100644 (file)
index 0000000..18c3d99
--- /dev/null
+++ b/test/CodeGen/X86/code_placement_outline_optional_branches.ll
@@ -0,0 +1,50 @@
+; RUN: llc -mcpu=corei7 -mtriple=x86_64-linux < %s | FileCheck %s -check-prefix=CHECK
+; RUN: llc -mcpu=corei7 -mtriple=x86_64-linux -outline-optional-branches < %s | FileCheck %s -check-prefix=CHECK-OUTLINE
+
+define void @foo(i32 %t1, i32 %t2) {
+; Test that we lift the call to 'c' up to immediately follow the call to 'b'
+; when we disable the cfg conflict check.
+;
+; CHECK-LABEL: foo:
+; CHECK: callq a
+; CHECK: callq b
+; CHECK: callq c
+; CHECK: callq d
+;
+; CHECK-OUTLINE-LABEL: foo:
+; CHECK-OUTLINE: callq b
+; CHECK-OUTLINE: callq c
+; CHECK-OUTLINE: callq d
+; CHECK-OUTLINE: callq a
+
+entry:
+  %cmp = icmp eq i32 %t1, 0
+  br i1 %cmp, label %if.then, label %if.end
+
+if.then:
+  call void @a()
+  br label %if.end
+
+if.end:
+  call void @b()
+  br label %hotbranch
+
+hotbranch:
+  %cmp2 = icmp eq i32 %t2, 0
+  br i1 %cmp2, label %if.then2, label %if.end2, !prof !1
+
+if.then2:
+  call void @c()
+  br label %if.end2
+
+if.end2:
+  call void @d()
+  ret void
+}
+
+declare void @a()
+declare void @b()
+declare void @c()
+declare void @d()
+
+!1 = !{!"branch_weights", i32 64, i32 4}