During the CodeGenPrepare we often lower intrinsics (such as objsize)

and allow some optimizations to turn conditional branches into unconditional.
This commit adds a simple control-flow optimization which merges two consecutive
basic blocks which are connected by a single edge. This allows the codegen to
operate on larger basic blocks.

rdar://11973998

llvm-svn: 161852

1 files changed, 7 insertions, 6 deletions

diff --git a/llvm/test/CodeGen/ARM/debug-info-branch-folding.ll b/llvm/test/CodeGen/ARM/debug-info-branch-folding.ll
index 9bdae436de4..4f4ff8e8170 100644
--- a/llvm/test/CodeGen/ARM/debug-info-branch-folding.ll
+++ b/llvm/test/CodeGen/ARM/debug-info-branch-folding.ll
@@ -3,16 +3,17 @@ target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:32-
 target triple = "thumbv7-apple-macosx10.6.7"
 
 ;CHECK: 	vadd.f32	q4, q8, q8
-;CHECK-NEXT: Ltmp
-;CHECK-NEXT: 	@DEBUG_VALUE: y <- Q4+0
-;CHECK-NEXT:    @DEBUG_VALUE: x <- Q4+0
+;CHECK-NEXT: Ltmp1
+
+;CHECK:@DEBUG_VALUE: x <- Q4+0
+;CHECK-NEXT:@DEBUG_VALUE: y <- Q4+0
 
 
 @.str = external constant [13 x i8]
 
 declare <4 x float> @test0001(float) nounwind readnone ssp
 
-define i32 @main(i32 %argc, i8** nocapture %argv) nounwind ssp {
+define i32 @main(i32 %argc, i8** nocapture %argv, i1 %cond) nounwind ssp {
 entry:
   br label %for.body9
 
@@ -21,7 +22,7 @@ for.body9:                                        ; preds = %for.body9, %entry
   tail call void @llvm.dbg.value(metadata !{<4 x float> %add19}, i64 0, metadata !27), !dbg !39
   %add20 = fadd <4 x float> undef, <float 0.000000e+00, float 0.000000e+00, float 0.000000e+00, float 1.000000e+00>, !dbg !39
   tail call void @llvm.dbg.value(metadata !{<4 x float> %add20}, i64 0, metadata !28), !dbg !39
-  br i1 undef, label %for.end54, label %for.body9, !dbg !44
+  br i1 %cond, label %for.end54, label %for.body9, !dbg !44
 
 for.end54:                                        ; preds = %for.body9
   %tmp115 = extractelement <4 x float> %add19, i32 1
@@ -52,7 +53,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata) nounwind readnone
 !7 = metadata !{i32 589860, metadata !2, metadata !"float", null, i32 0, i64 32, i64 32, i64 0, i32 0, i32 4} ; [ DW_TAG_base_type ]
 !8 = metadata !{metadata !9}
 !9 = metadata !{i32 589857, i64 0, i64 3}         ; [ DW_TAG_subrange_type ]
-!10 = metadata !{i32 589870, i32 0, metadata !1, metadata !"main", metadata !"main", metadata !"", metadata !1, i32 59, metadata !11, i1 false, i1 true, i32 0, i32 0, i32 0, i32 256, i1 true, i32 (i32, i8**)* @main, null} ; [ DW_TAG_subprogram ]
+!10 = metadata !{i32 589870, i32 0, metadata !1, metadata !"main", metadata !"main", metadata !"", metadata !1, i32 59, metadata !11, i1 false, i1 true, i32 0, i32 0, i32 0, i32 256, i1 true, i32 (i32, i8**, i1)* @main, null} ; [ DW_TAG_subprogram ]
 !11 = metadata !{i32 589845, metadata !1, metadata !"", metadata !1, i32 0, i64 0, i64 0, i32 0, i32 0, i32 0, metadata !12, i32 0, i32 0} ; [ DW_TAG_subroutine_type ]
 !12 = metadata !{metadata !13}
 !13 = metadata !{i32 589860, metadata !2, metadata !"int", null, i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ]