Use cbz and cbnz instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85698 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/Thumb2/machine-licm.ll

@@ -8,6 +8,8 @@
 
 define arm_apcscc void @t(i32* nocapture %vals, i32 %c) nounwind {
 entry:
+; CHECK: t:
+; CHECK: cbz
   %0 = icmp eq i32 %c, 0                          ; <i1> [#uses=1]
   br i1 %0, label %return, label %bb.nph
 

test/CodeGen/Thumb2/thumb2-cbnz.ll

@@ -0,0 +1,32 @@
+; RUN: llc < %s -mtriple=thumbv7-apple-darwin -mcpu=cortex-a8 | FileCheck %s
+; rdar://7354379
+
+declare arm_apcscc double @floor(double) nounwind readnone
+
+define void @t(i1 %a, double %b) {
+entry:
+  br i1 %a, label %bb3, label %bb1
+
+bb1:                                              ; preds = %entry
+  unreachable
+
+bb3:                                              ; preds = %entry
+  br i1 %a, label %bb7, label %bb5
+
+bb5:                                              ; preds = %bb3
+  unreachable
+
+bb7:                                              ; preds = %bb3
+  br i1 %a, label %bb11, label %bb9
+
+bb9:                                              ; preds = %bb7
+; CHECK: @ BB#3:
+; CHECK: cbnz
+  %0 = tail call arm_apcscc  double @floor(double %b) nounwind readnone ; <double> [#uses=0]
+  br label %bb11
+
+bb11:                                             ; preds = %bb9, %bb7
+  %1 = getelementptr i32* undef, i32 0
+  store i32 0, i32* %1
+  ret void
+}