[IndVarSimplify] Add additional PR33181 tests; NFC

Two more tests with a switch to a dynamically dead IV, with poison
occuring on the first or second iteration.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362291 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/IndVarSimplify/pr31181.ll b/test/Transforms/IndVarSimplify/lftr-pr31181.ll
similarity index 72%
rename from test/Transforms/IndVarSimplify/pr31181.ll
rename to test/Transforms/IndVarSimplify/lftr-pr31181.ll
index 453bb84192983071b9234ac6c9bea01b881960e0..8316d8dbce2fe4a4218d4252ca56fbb527906fe7 100644 (file)
--- a/test/Transforms/IndVarSimplify/pr31181.ll
+++ b/test/Transforms/IndVarSimplify/lftr-pr31181.ll
@@ -180,8 +180,8 @@ exit:
 
 ; Adopted from D30446.
 ; We switch from %iv to %iv2 and need to change nsw to nuw in the process.
-define i32 @switch_to_different_iv_pos_inc(i32* %ptr, i1 %always_false) {
-; CHECK-LABEL: @switch_to_different_iv_pos_inc(
+define i32 @switch_to_different_iv_post_inc(i32* %ptr, i1 %always_false) {
+; CHECK-LABEL: @switch_to_different_iv_post_inc(
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    br label [[FOR_COND:%.*]]
 ; CHECK:       for.cond:
@@ -215,7 +215,7 @@ never_taken:
 
 always_taken:
   %iv.inc = add nsw i32 %iv, 1
-  %iv2.inc = add nsw i32 %iv2, 1
+  %iv2.inc = add nuw nsw i32 %iv2, 1
   %cmp = icmp slt i32 %iv, 20
   br i1 %cmp, label %for.cond, label %for.end
 
@@ -266,9 +266,95 @@ never_taken:
 
 always_taken:
   %iv.inc = add nsw i32 %iv, 1
-  %iv2.inc = add nsw i32 %iv2, 1
+  %iv2.inc = add nuw nsw i32 %iv2, 1
   br label %for.cond
 
 for.end:
   ret i32 0
 }
+
+define i32 @switch_to_different_iv_first_poison(i32* %ptr, i1 %always_false) {
+; CHECK-LABEL: @switch_to_different_iv_first_poison(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br label [[FOR_COND:%.*]]
+; CHECK:       for.cond:
+; CHECK-NEXT:    [[IV2:%.*]] = phi i32 [ -1, [[ENTRY:%.*]] ], [ [[IV2_INC:%.*]], [[ALWAYS_TAKEN:%.*]] ]
+; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ -2147483648, [[ENTRY]] ], [ [[IV_INC:%.*]], [[ALWAYS_TAKEN]] ]
+; CHECK-NEXT:    store i32 [[IV]], i32* [[PTR:%.*]]
+; CHECK-NEXT:    br i1 [[ALWAYS_FALSE:%.*]], label [[NEVER_TAKEN:%.*]], label [[ALWAYS_TAKEN]]
+; CHECK:       never_taken:
+; CHECK-NEXT:    store volatile i32 [[IV2]], i32* [[PTR]]
+; CHECK-NEXT:    br label [[ALWAYS_TAKEN]]
+; CHECK:       always_taken:
+; CHECK-NEXT:    [[IV2_INC]] = add nuw nsw i32 [[IV2]], 1
+; CHECK-NEXT:    [[IV_INC]] = add nsw i32 [[IV]], 1
+; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp ne i32 [[IV2_INC]], -2147483628
+; CHECK-NEXT:    br i1 [[EXITCOND]], label [[FOR_COND]], label [[FOR_END:%.*]]
+; CHECK:       for.end:
+; CHECK-NEXT:    ret i32 0
+;
+entry:
+  br label %for.cond
+
+for.cond:
+  %iv2 = phi i32 [ -1, %entry ], [ %iv2.inc, %always_taken ]
+  %iv = phi i32 [ -2147483648, %entry ], [ %iv.inc, %always_taken ]
+  store i32 %iv, i32* %ptr
+  br i1 %always_false, label %never_taken, label %always_taken
+
+never_taken:
+  store volatile i32 %iv2, i32* %ptr
+  br label %always_taken
+
+always_taken:
+  %iv2.inc = add nuw nsw i32 %iv2, 1
+  %iv.inc = add nsw i32 %iv, 1
+  %cmp = icmp slt i32 %iv, 20
+  br i1 %cmp, label %for.cond, label %for.end
+
+for.end:
+  ret i32 0
+}
+
+define i32 @switch_to_different_iv_second_poison(i32* %ptr, i1 %always_false) {
+; CHECK-LABEL: @switch_to_different_iv_second_poison(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br label [[FOR_COND:%.*]]
+; CHECK:       for.cond:
+; CHECK-NEXT:    [[IV2:%.*]] = phi i32 [ -2, [[ENTRY:%.*]] ], [ [[IV2_INC:%.*]], [[ALWAYS_TAKEN:%.*]] ]
+; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ -2147483648, [[ENTRY]] ], [ [[IV_INC:%.*]], [[ALWAYS_TAKEN]] ]
+; CHECK-NEXT:    store i32 [[IV]], i32* [[PTR:%.*]]
+; CHECK-NEXT:    br i1 [[ALWAYS_FALSE:%.*]], label [[NEVER_TAKEN:%.*]], label [[ALWAYS_TAKEN]]
+; CHECK:       never_taken:
+; CHECK-NEXT:    store volatile i32 [[IV2]], i32* [[PTR]]
+; CHECK-NEXT:    br label [[ALWAYS_TAKEN]]
+; CHECK:       always_taken:
+; CHECK-NEXT:    [[IV2_INC]] = add nuw nsw i32 [[IV2]], 1
+; CHECK-NEXT:    [[IV_INC]] = add nsw i32 [[IV]], 1
+; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp ne i32 [[IV2_INC]], -2147483629
+; CHECK-NEXT:    br i1 [[EXITCOND]], label [[FOR_COND]], label [[FOR_END:%.*]]
+; CHECK:       for.end:
+; CHECK-NEXT:    ret i32 0
+;
+entry:
+  br label %for.cond
+
+for.cond:
+  %iv2 = phi i32 [ -2, %entry ], [ %iv2.inc, %always_taken ]
+  %iv = phi i32 [ -2147483648, %entry ], [ %iv.inc, %always_taken ]
+  store i32 %iv, i32* %ptr
+  br i1 %always_false, label %never_taken, label %always_taken
+
+never_taken:
+  store volatile i32 %iv2, i32* %ptr
+  br label %always_taken
+
+always_taken:
+  %iv2.inc = add nuw nsw i32 %iv2, 1
+  %iv.inc = add nsw i32 %iv, 1
+  %cmp = icmp slt i32 %iv, 20
+  br i1 %cmp, label %for.cond, label %for.end
+
+for.end:
+  ret i32 0
+}