Add support for tail duplication to BranchFolding, and extend
tail merging support to handle more cases.
- Recognize several cases where tail merging is beneficial even when
the tail size is smaller than the generic threshold.
- Make use of MachineInstrDesc::isBarrier to help detect
non-fallthrough blocks.
- Check for and avoid disrupting fall-through edges in more cases.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86871 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/X86/loop-blocks.ll b/test/CodeGen/X86/loop-blocks.ll
index c0379d1..ec5236b 100644
--- a/test/CodeGen/X86/loop-blocks.ll
+++ b/test/CodeGen/X86/loop-blocks.ll
@@ -74,16 +74,16 @@
; CHECK: yet_more_involved:
; CHECK: jmp .LBB3_1
; CHECK-NEXT: align
-; CHECK-NEXT: .LBB3_3:
+; CHECK-NEXT: .LBB3_4:
; CHECK-NEXT: call bar99
; CHECK-NEXT: call get
; CHECK-NEXT: cmpl $2999, %eax
-; CHECK-NEXT: jg .LBB3_5
+; CHECK-NEXT: jg .LBB3_6
; CHECK-NEXT: call block_a_true_func
-; CHECK-NEXT: jmp .LBB3_6
-; CHECK-NEXT: .LBB3_5:
-; CHECK-NEXT: call block_a_false_func
+; CHECK-NEXT: jmp .LBB3_7
; CHECK-NEXT: .LBB3_6:
+; CHECK-NEXT: call block_a_false_func
+; CHECK-NEXT: .LBB3_7:
; CHECK-NEXT: call block_a_merge_func
; CHECK-NEXT: .LBB3_1:
; CHECK-NEXT: call body