[JumpThreading] Fix opcode bonus in getJumpThreadDuplicationCost()

The code that was meant to adjust the duplication cost based on the
terminator opcode was not being executed in cases where the initial
threshold was hit inside the loop.

Subscribers: mcrosier, llvm-commits

Differential Revision: http://reviews.llvm.org/D15536

llvm-svn: 256568

1 files changed, 30 insertions, 0 deletions

diff --git a/llvm/test/Transforms/JumpThreading/select.ll b/llvm/test/Transforms/JumpThreading/select.ll
index d0df7725f72..595cacbcbf5 100644
--- a/llvm/test/Transforms/JumpThreading/select.ll
+++ b/llvm/test/Transforms/JumpThreading/select.ll
@@ -91,6 +91,36 @@ L3:
 }
 
 
+; Jump threading of indirectbr with select as address.  Test increased
+; duplication threshold for cases where indirectbr is being threaded
+; through.
+
+; CHECK-LABEL: @test_indirectbr_thresh(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: br i1 %cond, label %L1, label %L3
+; CHECK-NOT: indirectbr
+define void @test_indirectbr_thresh(i1 %cond, i8* %address) nounwind {
+entry:
+  br i1 %cond, label %L0, label %L3
+L0:
+  %indirect.goto.dest = select i1 %cond, i8* blockaddress(@test_indirectbr_thresh, %L1), i8* %address
+  call void @quux()
+  call void @quux()
+  call void @quux()
+  indirectbr i8* %indirect.goto.dest, [label %L1, label %L2, label %L3]
+
+L1:
+  call void @foo()
+  ret void
+L2:
+  call void @bar()
+  ret void
+L3:
+  call void @baz()
+  ret void
+}
+
+
 ; A more complicated case: the condition is a select based on a comparison.
 
 ; CHECK-LABEL: @test_switch_cmp(