From: David Green <david.green@arm.com>
Date: Tue, 8 Jun 2021 20:54:59 +0000 (+0100)
Subject: [DSE] Add another multiblock loop DSE test. NFC
X-Git-Tag: llvmorg-14-init~4515
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0178ae734ca33265fe051c39deff6d7d530f6239;p=platform%2Fupstream%2Fllvm.git

[DSE] Add another multiblock loop DSE test. NFC

As reported in D100464, the stores in these loops should not be removed.
---

diff --git a/llvm/test/Transforms/DeadStoreElimination/multiblock-loops.ll b/llvm/test/Transforms/DeadStoreElimination/multiblock-loops.ll
index e887a47..67250fd 100644
--- a/llvm/test/Transforms/DeadStoreElimination/multiblock-loops.ll
+++ b/llvm/test/Transforms/DeadStoreElimination/multiblock-loops.ll
@@ -706,3 +706,59 @@ exit:
   ret i16 0
 }
 
+define void @InitializeMasks(i64* %p) {
+; CHECK-LABEL: @InitializeMasks(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br label [[FOR_BODY98:%.*]]
+; CHECK:       for.body98:
+; CHECK-NEXT:    [[INDVARS_IV377:%.*]] = phi i64 [ 8, [[ENTRY:%.*]] ], [ [[INC2:%.*]], [[FOR_INC140:%.*]] ], [ [[INC1:%.*]], [[FOR_INC140_THREAD:%.*]] ]
+; CHECK-NEXT:    [[ARRAYIDX106:%.*]] = getelementptr inbounds i64, i64* [[P:%.*]], i64 [[INDVARS_IV377]]
+; CHECK-NEXT:    store i64 1, i64* [[ARRAYIDX106]], align 8
+; CHECK-NEXT:    [[CMP107:%.*]] = icmp ugt i64 [[INDVARS_IV377]], 15
+; CHECK-NEXT:    br i1 [[CMP107]], label [[IF_END:%.*]], label [[IF_END_THREAD:%.*]]
+; CHECK:       if.end.thread:
+; CHECK-NEXT:    br label [[FOR_INC140_THREAD]]
+; CHECK:       if.end:
+; CHECK-NEXT:    store i64 2, i64* [[ARRAYIDX106]], align 8
+; CHECK-NEXT:    [[CMP127:%.*]] = icmp ult i64 [[INDVARS_IV377]], 48
+; CHECK-NEXT:    br i1 [[CMP127]], label [[FOR_INC140_THREAD]], label [[FOR_INC140]]
+; CHECK:       for.inc140.thread:
+; CHECK-NEXT:    [[INC1]] = add i64 [[INDVARS_IV377]], 1
+; CHECK-NEXT:    br label [[FOR_BODY98]]
+; CHECK:       for.inc140:
+; CHECK-NEXT:    [[INC2]] = add i64 [[INDVARS_IV377]], 1
+; CHECK-NEXT:    [[EXITCOND384_NOT:%.*]] = icmp eq i64 [[INDVARS_IV377]], 56
+; CHECK-NEXT:    br i1 [[EXITCOND384_NOT]], label [[FOR_INC177:%.*]], label [[FOR_BODY98]]
+; CHECK:       for.inc177:
+; CHECK-NEXT:    ret void
+;
+entry:
+  br label %for.body98
+
+for.body98:                                       ; preds = %for.inc140, %for.inc140.thread, %entry
+  %indvars.iv377 = phi i64 [ 8, %entry ], [ %inc2, %for.inc140 ], [ %inc1, %for.inc140.thread ]
+  %arrayidx106 = getelementptr inbounds i64, i64* %p, i64 %indvars.iv377
+  store i64 1, i64* %arrayidx106, align 8
+  %cmp107 = icmp ugt i64 %indvars.iv377, 15
+  br i1 %cmp107, label %if.end, label %if.end.thread
+
+if.end.thread:                                    ; preds = %for.body98
+  br label %for.inc140.thread
+
+if.end:                                           ; preds = %for.body98
+  store i64 2, i64* %arrayidx106, align 8
+  %cmp127 = icmp ult i64 %indvars.iv377, 48
+  br i1 %cmp127, label %for.inc140.thread, label %for.inc140
+
+for.inc140.thread:                                ; preds = %if.end, %if.end.thread
+  %inc1 = add i64 %indvars.iv377, 1
+  br label %for.body98
+
+for.inc140:                                       ; preds = %if.end
+  %inc2 = add i64 %indvars.iv377, 1
+  %exitcond384.not = icmp eq i64 %indvars.iv377, 56
+  br i1 %exitcond384.not, label %for.inc177, label %for.body98
+
+for.inc177:                                       ; preds = %for.inc140
+  ret void
+}