Use MachineBranchProbabilityInfo in If-Conversion instead of its own heuristics.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136826 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/ARM/ifcvt4.ll

@@ -1,8 +1,10 @@
-; RUN: llc < %s -march=arm
-; RUN: llc < %s -march=arm | grep subgt | count 1
-; RUN: llc < %s -march=arm | grep suble | count 1
-; FIXME: Check for # of unconditional branch after adding branch folding post ifcvt.
+; RUN: llc < %s -march=arm | FileCheck %s
 
+; Do not if-convert when branches go to the different loops.
+; CHECK: _t:
+; CHECK-NOT: subgt
+; CHECK-NOT: suble
+; Don't use
 define i32 @t(i32 %a, i32 %b) {
 entry:
 	%tmp1434 = icmp eq i32 %a, %b		; <i1> [#uses=1]

test/CodeGen/ARM/indirectbr.ll

@@ -22,7 +22,6 @@ bb2:                                              ; preds = %entry, %bb3
   %gotovar.4.0 = phi i8* [ %gotovar.4.0.pre, %bb3 ], [ %0, %entry ] ; <i8*> [#uses=1]
 ; ARM: bx
 ; THUMB: mov pc,
-; THUMB2: mov pc,
   indirectbr i8* %gotovar.4.0, [label %L5, label %L4, label %L3, label %L2, label %L1]
 
 bb3:                                              ; preds = %entry

test/CodeGen/Thumb2/2010-06-21-TailMergeBug.ll

@@ -32,15 +32,15 @@
 
 define fastcc i32 @parse_percent_token() nounwind {
 entry:
-; CHECK: ittt eq
-; CHECK: ittt eq
-; CHECK: ittt eq
-; CHECK: ittt eq
-; CHECK: ittt eq
-; CHECK: moveq r0
-; CHECK-NOT: LBB0_
-; CHECK: ldreq
-; CHECK: popeq
+; CHECK: pop
+; CHECK: pop
+; CHECK: pop
+; CHECK: pop
+; CHECK: pop
+; CHECK: pop
+; CHECK: pop
+; Do not convert into single stream code. BranchProbability Analysis assumes
+; that branches which goes to "ret" intruction have lower probabilities.
   switch i32 undef, label %bb7 [
     i32 37, label %bb43
     i32 48, label %bb5

test/CodeGen/Thumb2/thumb2-ifcvt1.ll

@@ -21,13 +21,13 @@ cond_next:
 	ret i32 %tmp15
 }
 
-; FIXME: Check for # of unconditional branch after adding branch folding post ifcvt.
 define i32 @t2(i32 %a, i32 %b) nounwind {
 entry:
+; Do not if-convert when branches go to the different loops.
 ; CHECK: t2:
-; CHECK: ite gt
-; CHECK: subgt
-; CHECK: suble
+; CHECK-NOT: ite gt
+; CHECK-NOT: subgt
+; CHECK-NOT: suble
 	%tmp1434 = icmp eq i32 %a, %b		; <i1> [#uses=1]
 	br i1 %tmp1434, label %bb17, label %bb.outer