Add support for reduction variables when IF-conversion is enabled.

llvm-svn: 169288

1 files changed, 48 insertions, 0 deletions

diff --git a/llvm/test/Transforms/LoopVectorize/if-conversion.ll b/llvm/test/Transforms/LoopVectorize/if-conversion.ll
index 35c549caf18..b4701b96555 100644
--- a/llvm/test/Transforms/LoopVectorize/if-conversion.ll
+++ b/llvm/test/Transforms/LoopVectorize/if-conversion.ll
@@ -58,3 +58,51 @@ if.end:
 for.end:
   ret i32 undef
 }
+
+
+
+; int func(int *A, int n) {
+;   unsigned sum = 0;
+;   for (int i = 0; i < n; ++i)
+;     if (A[i] > 30)
+;       sum += A[i] + 2;
+;
+;   return sum;
+; }
+
+;CHECK: @reduction_func
+;CHECK: load <4 x i32>
+;CHECK: icmp sgt <4 x i32>
+;CHECK: add <4 x i32>
+;CHECK: select <4 x i1>
+;CHECK: ret i32
+define i32 @reduction_func(i32* nocapture %A, i32 %n) nounwind uwtable readonly ssp {
+entry:
+  %cmp10 = icmp sgt i32 %n, 0
+  br i1 %cmp10, label %for.body, label %for.end
+
+for.body:                                         ; preds = %entry, %for.inc
+  %indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
+  %sum.011 = phi i32 [ %sum.1, %for.inc ], [ 0, %entry ]
+  %arrayidx = getelementptr inbounds i32* %A, i64 %indvars.iv
+  %0 = load i32* %arrayidx, align 4
+  %cmp1 = icmp sgt i32 %0, 30
+  br i1 %cmp1, label %if.then, label %for.inc
+
+if.then:                                          ; preds = %for.body
+  %add = add i32 %sum.011, 2
+  %add4 = add i32 %add, %0
+  br label %for.inc
+
+for.inc:                                          ; preds = %for.body, %if.then
+  %sum.1 = phi i32 [ %add4, %if.then ], [ %sum.011, %for.body ]
+  %indvars.iv.next = add i64 %indvars.iv, 1
+  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
+  %exitcond = icmp eq i32 %lftr.wideiv, %n
+  br i1 %exitcond, label %for.end, label %for.body
+
+for.end:                                          ; preds = %for.inc, %entry
+  %sum.0.lcssa = phi i32 [ 0, %entry ], [ %sum.1, %for.inc ]
+  ret i32 %sum.0.lcssa
+}
+