Add vectorize-s115.ll

Author: ShivaChen

llvm/test/Transforms/LoopVectorize/vectorize-s115.ll

@@ -0,0 +1,51 @@
+; RUN: opt < %s -passes=loop-vectorize -force-vector-width=2 -S | FileCheck %s
+
+@aa = global [256 x [256 x float]] zeroinitializer, align 4
+@a = global [32000 x float] zeroinitializer, align 4
+
+;; for (int j = 0; j < 256; j++)
+;;   for (int i = j+1; i < 256; i++)
+;;     a[i] -= aa[j][i] * a[j];
+
+; CHECK-NOT: vector.body:
+
+define signext i32 @s115() {
+entry:
+  br label %for.body
+
+for.cond.loopexit.loopexit:                       ; preds = %for.body4
+  br label %for.cond.loopexit
+
+for.cond.loopexit:                                ; preds = %for.cond.loopexit.loopexit, %for.body
+  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
+  %exitcond28.not = icmp eq i64 %indvars.iv.next27, 256
+  br i1 %exitcond28.not, label %for.cond.cleanup, label %for.body
+
+for.cond.cleanup:                                 ; preds = %for.cond.loopexit
+  ret i32 0
+
+for.body:                                         ; preds = %entry, %for.cond.loopexit
+  %indvars.iv26 = phi i64 [ 0, %entry ], [ %indvars.iv.next27, %for.cond.loopexit ]
+  %indvars.iv = phi i64 [ 1, %entry ], [ %indvars.iv.next, %for.cond.loopexit ]
+  %indvars.iv.next27 = add nuw nsw i64 %indvars.iv26, 1
+  %cmp221 = icmp ult i64 %indvars.iv26, 255
+  br i1 %cmp221, label %for.body4.lr.ph, label %for.cond.loopexit
+
+for.body4.lr.ph:                                  ; preds = %for.body
+  %arrayidx8 = getelementptr inbounds [32000 x float], ptr @a, i64 0, i64 %indvars.iv26
+  br label %for.body4
+
+for.body4:                                        ; preds = %for.body4.lr.ph, %for.body4
+  %indvars.iv24 = phi i64 [ %indvars.iv, %for.body4.lr.ph ], [ %indvars.iv.next25, %for.body4 ]
+  %arrayidx6 = getelementptr inbounds [256 x [256 x float]], ptr @aa, i64 0, i64 %indvars.iv26, i64 %indvars.iv24
+  %0 = load float, ptr %arrayidx6, align 4
+  %1 = load float, ptr %arrayidx8, align 4
+  %arrayidx10 = getelementptr inbounds [32000 x float], ptr @a, i64 0, i64 %indvars.iv24
+  %2 = load float, ptr %arrayidx10, align 4
+  %neg = fneg float %0
+  %3 = tail call float @llvm.fmuladd.f32(float %neg, float %1, float %2)
+  store float %3, ptr %arrayidx10, align 4
+  %indvars.iv.next25 = add nuw nsw i64 %indvars.iv24, 1
+  %exitcond.not = icmp eq i64 %indvars.iv.next25, 256
+  br i1 %exitcond.not, label %for.cond.loopexit.loopexit, label %for.body4
+}