From a98081c9f5b30ec16be2cdaa0a9cfa1ef1588b34 Mon Sep 17 00:00:00 2001
From: Tobias Grosser <tobias@grosser.es>
Date: Mon, 7 Aug 2017 22:02:06 +0000
Subject: [PATCH] [test] Add one more test case for the previous commit

llvm-svn: 310312
---
 .../reduction_looprotate_licm_double_write.ll      | 108 +++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 polly/test/DeLICM/reduction_looprotate_licm_double_write.ll

diff --git a/polly/test/DeLICM/reduction_looprotate_licm_double_write.ll b/polly/test/DeLICM/reduction_looprotate_licm_double_write.ll
new file mode 100644
index 0000000..3fedca0
--- /dev/null
+++ b/polly/test/DeLICM/reduction_looprotate_licm_double_write.ll
@@ -0,0 +1,108 @@
+; RUN: opt %loadPolly -polly-flatten-schedule \
+; RUN: -polly-delicm-overapproximate-writes=true \
+; RUN: -polly-delicm-compute-known=true -polly-delicm \
+; RUN: -analyze < %s | FileCheck %s
+;
+; Make sure delicm works even in case two stores that store the same value.
+;
+;    void func(double *A) {
+;      for (int j = 0; j < 2; j += 1) { /* outer */
+;        double phi = A[j];
+;        for (int i = 0; i < 4; i += 1) /* reduction */
+;          phi += 4.2;
+;        A[j] = phi;
+;      }
+;    }
+;
+define void @func(double* noalias nonnull %A) {
+entry:
+  br label %outer.preheader
+
+outer.preheader:
+  br label %outer.for
+
+outer.for:
+  %j = phi i32 [0, %outer.preheader], [%j.inc, %outer.inc]
+  %j.cmp = icmp slt i32 %j, 2
+  br i1 %j.cmp, label %reduction.preheader, label %outer.exit
+
+
+    reduction.preheader:
+      %A_idx = getelementptr inbounds double, double* %A, i32 %j
+      %init = load double, double* %A_idx
+      br label %reduction.for
+
+    reduction.for:
+      %i = phi i32 [0, %reduction.preheader], [%i.inc, %reduction.inc]
+      %phi = phi double [%init, %reduction.preheader], [%add, %reduction.inc]
+      br label %body
+
+
+
+        body:
+          %add = fadd double %phi, 4.2
+          br label %reduction.inc
+
+
+
+    reduction.inc:
+      %i.inc = add nuw nsw i32 %i, 1
+      %i.cmp = icmp slt i32 %i.inc, 4
+      br i1 %i.cmp, label %reduction.for, label %reduction.exit
+
+    reduction.exit:
+      store double %add, double* %A_idx
+      store double %add, double* %A_idx
+      br label %outer.inc
+
+
+
+outer.inc:
+  %j.inc = add nuw nsw i32 %j, 1
+  br label %outer.for
+
+outer.exit:
+  br label %return
+
+return:
+  ret void
+}
+
+
+; CHECK:      After accesses {
+; CHECK-NEXT:     Stmt_reduction_preheader
+; CHECK-NEXT:             ReadAccess :=       [Reduction Type: NONE] [Scalar: 0]
+; CHECK-NEXT:                 { Stmt_reduction_preheader[i0] -> MemRef_A[i0] };
+; CHECK-NEXT:             MustWriteAccess :=  [Reduction Type: NONE] [Scalar: 1]
+; CHECK-NEXT:                 { Stmt_reduction_preheader[i0] -> MemRef_phi__phi[] };
+; CHECK-NEXT:            new: { Stmt_reduction_preheader[i0] -> MemRef_A[i0] };
+; CHECK-NEXT:     Stmt_reduction_for
+; CHECK-NEXT:             ReadAccess :=       [Reduction Type: NONE] [Scalar: 1]
+; CHECK-NEXT:                 { Stmt_reduction_for[i0, i1] -> MemRef_phi__phi[] };
+; CHECK-NEXT:            new: { Stmt_reduction_for[i0, i1] -> MemRef_A[i0] };
+; CHECK-NEXT:             MustWriteAccess :=  [Reduction Type: NONE] [Scalar: 1]
+; CHECK-NEXT:                 { Stmt_reduction_for[i0, i1] -> MemRef_phi[] };
+; CHECK-NEXT:            new: { Stmt_reduction_for[i0, i1] -> MemRef_A[i0] };
+; CHECK-NEXT:     Stmt_body
+; CHECK-NEXT:             MustWriteAccess :=  [Reduction Type: NONE] [Scalar: 1]
+; CHECK-NEXT:                 { Stmt_body[i0, i1] -> MemRef_add[] };
+; CHECK-NEXT:            new: { Stmt_body[i0, i1] -> MemRef_A[i0] };
+; CHECK-NEXT:             ReadAccess :=       [Reduction Type: NONE] [Scalar: 1]
+; CHECK-NEXT:                 { Stmt_body[i0, i1] -> MemRef_phi[] };
+; CHECK-NEXT:            new: { Stmt_body[i0, i1] -> MemRef_A[i0] : 3i1 <= 22 - 14i0; Stmt_body[1, 3] -> MemRef_A[1] };
+; CHECK-NEXT:     Stmt_reduction_inc
+; CHECK-NEXT:             ReadAccess :=       [Reduction Type: NONE] [Scalar: 1]
+; CHECK-NEXT:                 { Stmt_reduction_inc[i0, i1] -> MemRef_add[] };
+; CHECK-NEXT:            new: { Stmt_reduction_inc[i0, i1] -> MemRef_A[i0] : 3i1 <= 22 - 14i0; Stmt_reduction_inc[1, 3] -> MemRef_A[1] };
+; CHECK-NEXT:             MustWriteAccess :=  [Reduction Type: NONE] [Scalar: 1]
+; CHECK-NEXT:                 { Stmt_reduction_inc[i0, i1] -> MemRef_phi__phi[] };
+; CHECK-NEXT:            new: { Stmt_reduction_inc[i0, i1] -> MemRef_A[i0] };
+; CHECK-NEXT:     Stmt_reduction_exit
+; CHECK-NEXT:             MustWriteAccess :=  [Reduction Type: NONE] [Scalar: 0]
+; CHECK-NEXT:                 { Stmt_reduction_exit[i0] -> MemRef_A[i0] };
+; CHECK-NEXT:             ReadAccess :=       [Reduction Type: NONE] [Scalar: 1]
+; CHECK-NEXT:                 { Stmt_reduction_exit[i0] -> MemRef_add[] };
+; CHECK-NEXT:            new: { Stmt_reduction_exit[i0] -> MemRef_A[i0] };
+; CHECK-NEXT:             MustWriteAccess :=  [Reduction Type: NONE] [Scalar: 0]
+; CHECK-NEXT:                 { Stmt_reduction_exit[i0] -> MemRef_A[i0] };
+; CHECK-NEXT: }
-- 
2.7.4