[Test] One more test for PR57247

Show that the issue also exists with positive steps.
llvm · Aug 22, 2022 · bedf43b · bedf43b
1 parent 7167a42
commit bedf43b
Showing 1 changed file with 49 additions and 2 deletions.
diff --git a/llvm/test/Transforms/IndVarSimplify/pr57247.ll b/llvm/test/Transforms/IndVarSimplify/pr57247.ll
@@ -2,8 +2,8 @@
 ; RUN: opt -S -passes=indvars < %s | FileCheck %s
 
 ; We must NOT replace check against IV with check against invariant 0. It should fail.
-define i32 @test() {
-; CHECK-LABEL: @test(
+define i32 @test_01() {
+; CHECK-LABEL: @test_01(
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    br label [[OUTER_LOOP:%.*]]
 ; CHECK:       outer.loop:
@@ -48,3 +48,50 @@ outer.latch:                                      ; preds = %inner.latch
 exit:                                             ; preds = %inner.loop
   ret i32 %iv
 }
+
+define i32 @test_02() {
+; CHECK-LABEL: @test_02(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br label [[OUTER_LOOP:%.*]]
+; CHECK:       outer.loop:
+; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[OUTER_LATCH:%.*]] ]
+; CHECK-NEXT:    [[CHECK_1:%.*]] = icmp ult i32 [[IV]], 2147483640
+; CHECK-NEXT:    br label [[INNER_LOOP:%.*]]
+; CHECK:       inner.loop:
+; CHECK-NEXT:    [[STOREMERGE611_I:%.*]] = phi i64 [ 0, [[OUTER_LOOP]] ], [ [[ADD_I:%.*]], [[INNER_LATCH:%.*]] ]
+; CHECK-NEXT:    br i1 [[CHECK_1]], label [[INNER_LATCH]], label [[EXIT:%.*]]
+; CHECK:       inner.latch:
+; CHECK-NEXT:    [[ADD_I]] = add nuw nsw i64 [[STOREMERGE611_I]], 1
+; CHECK-NEXT:    [[CMP5_I:%.*]] = icmp ult i64 [[STOREMERGE611_I]], 11
+; CHECK-NEXT:    br i1 [[CMP5_I]], label [[INNER_LOOP]], label [[OUTER_LATCH]]
+; CHECK:       outer.latch:
+; CHECK-NEXT:    [[IV_NEXT]] = add nuw i32 [[IV]], 10
+; CHECK-NEXT:    br label [[OUTER_LOOP]]
+; CHECK:       exit:
+; CHECK-NEXT:    [[IV_LCSSA:%.*]] = phi i32 [ [[IV]], [[INNER_LOOP]] ]
+; CHECK-NEXT:    ret i32 [[IV_LCSSA]]
+;
+entry:
+  br label %outer.loop
+
+outer.loop:                                       ; preds = %outer.latch, %entry
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %outer.latch ]
+  %check_1 = icmp ult i32 %iv, 2147483640
+  br label %inner.loop
+
+inner.loop:                                       ; preds = %inner.latch, %outer.loop
+  %storemerge611.i = phi i64 [ 0, %outer.loop ], [ %add.i, %inner.latch ]
+  br i1 %check_1, label %inner.latch, label %exit
+
+inner.latch:                                      ; preds = %inner.loop
+  %add.i = add i64 %storemerge611.i, 1
+  %cmp5.i = icmp ult i64 %storemerge611.i, 11
+  br i1 %cmp5.i, label %inner.loop, label %outer.latch
+
+outer.latch:                                      ; preds = %inner.latch
+  %iv.next = add i32 %iv, 10
+  br label %outer.loop
+
+exit:                                             ; preds = %inner.loop
+  ret i32 %iv
+}