[llvm] r269267 - [Layout] Add a new test case for optimal rotation

[Xinliang David Li via llvm-commits]

Author: davidxl
Date: Wed May 11 21:19:16 2016
New Revision: 269267

URL: http://llvm.org/viewvc/llvm-project?rev=269267&view=rev
Log:
[Layout] Add a new test case for optimal rotation

Enabled by -force-precise-rotation-cost option

Added:
    llvm/trunk/test/CodeGen/X86/code_placement_loop_rotation3.ll

Added: llvm/trunk/test/CodeGen/X86/code_placement_loop_rotation3.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/code_placement_loop_rotation3.ll?rev=269267&view=auto
==============================================================================
--- llvm/trunk/test/CodeGen/X86/code_placement_loop_rotation3.ll (added)
+++ llvm/trunk/test/CodeGen/X86/code_placement_loop_rotation3.ll Wed May 11 21:19:16 2016
@@ -0,0 +1,43 @@
+; RUN: llc -mcpu=corei7 -mtriple=x86_64-linux -force-precise-rotation-cost < %s | FileCheck %s -check-prefix=CHECK
+
+define void @bar()  {
+; Test that all edges in the loop chain are fall through with profile data.
+;
+; CHECK-LABEL: bar:
+; CHECK: latch
+; CHECK: header
+; CHECK: if.then
+; CHECK: end
+
+entry:
+  br label %header
+
+header:
+  call void @e()
+  %call = call zeroext i1 @a()
+  br i1 %call, label %if.then, label %latch, !prof !2
+
+if.then:
+  call void @f()
+  %call3 = call zeroext i1 @a()
+  br i1 %call3, label %latch, label %end, !prof !3
+
+latch:
+  call void @h()
+  %call2 = call zeroext i1 @a()
+  br i1 %call2, label %header, label %end, !prof !4
+
+end:
+  ret void
+}
+
+declare zeroext i1 @a()
+declare void @e()
+declare void @f()
+declare void @g()
+declare void @h()
+
+!1 = !{!"branch_weights", i32 16, i32 16}
+!2 = !{!"branch_weights", i32 16, i32 16}
+!3 = !{!"branch_weights", i32 97, i32 3}
+!4 = !{!"branch_weights", i32 97, i32 3}