[InstCombine] Add more dependent IV tests (NFC)

Author: nikic

llvm/test/Transforms/InstCombine/dependent-ivs.ll

@@ -65,8 +65,8 @@ exit:
   ret void
 }
 
-define void @int_iv_commuted(i64 %base, i64 %end) {
-; CHECK-LABEL: define void @int_iv_commuted(
+define void @int_iv_commuted_add(i64 %base, i64 %end) {
+; CHECK-LABEL: define void @int_iv_commuted_add(
 ; CHECK-SAME: i64 [[BASE:%.*]], i64 [[END:%.*]]) {
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[BASE2:%.*]] = mul i64 [[BASE]], 42
@@ -99,6 +99,70 @@ exit:
   ret void
 }
 
+define void @int_iv_commuted_phi1(i64 %base, i64 %end) {
+; CHECK-LABEL: define void @int_iv_commuted_phi1(
+; CHECK-SAME: i64 [[BASE:%.*]], i64 [[END:%.*]]) {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br label [[LOOP:%.*]]
+; CHECK:       loop:
+; CHECK-NEXT:    [[IV2:%.*]] = phi i64 [ [[BASE]], [[ENTRY:%.*]] ], [ [[IV2_NEXT:%.*]], [[LOOP]] ]
+; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ 0, [[ENTRY]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
+; CHECK-NEXT:    call void @use.i64(i64 [[IV2]])
+; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i64 [[IV]], 4
+; CHECK-NEXT:    [[IV2_NEXT]] = add i64 [[IV_NEXT]], [[BASE]]
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i64 [[IV_NEXT]], [[END]]
+; CHECK-NEXT:    br i1 [[CMP]], label [[EXIT:%.*]], label [[LOOP]]
+; CHECK:       exit:
+; CHECK-NEXT:    ret void
+;
+entry:
+  br label %loop
+
+loop:
+  %iv2 = phi i64 [ %base, %entry ], [ %iv2.next, %loop ]
+  %iv = phi i64 [ %iv.next, %loop ], [ 0, %entry ]
+  call void @use.i64(i64 %iv2)
+  %iv.next = add nuw nsw i64 %iv, 4
+  %iv2.next = add i64 %iv.next, %base
+  %cmp = icmp eq i64 %iv.next, %end
+  br i1 %cmp, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+define void @int_iv_commuted_phi2(i64 %base, i64 %end) {
+; CHECK-LABEL: define void @int_iv_commuted_phi2(
+; CHECK-SAME: i64 [[BASE:%.*]], i64 [[END:%.*]]) {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br label [[LOOP:%.*]]
+; CHECK:       loop:
+; CHECK-NEXT:    [[IV2:%.*]] = phi i64 [ [[IV2_NEXT:%.*]], [[LOOP]] ], [ [[BASE]], [[ENTRY:%.*]] ]
+; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[LOOP]] ], [ 0, [[ENTRY]] ]
+; CHECK-NEXT:    call void @use.i64(i64 [[IV2]])
+; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i64 [[IV]], 4
+; CHECK-NEXT:    [[IV2_NEXT]] = add i64 [[IV_NEXT]], [[BASE]]
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i64 [[IV_NEXT]], [[END]]
+; CHECK-NEXT:    br i1 [[CMP]], label [[EXIT:%.*]], label [[LOOP]]
+; CHECK:       exit:
+; CHECK-NEXT:    ret void
+;
+entry:
+  br label %loop
+
+loop:
+  %iv2 = phi i64 [ %iv2.next, %loop ], [ %base, %entry ]
+  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
+  call void @use.i64(i64 %iv2)
+  %iv.next = add nuw nsw i64 %iv, 4
+  %iv2.next = add i64 %iv.next, %base
+  %cmp = icmp eq i64 %iv.next, %end
+  br i1 %cmp, label %exit, label %loop
+
+exit:
+  ret void
+}
+
 define void @int_iv_vector(<2 x i64> %base) {
 ; CHECK-LABEL: define void @int_iv_vector(
 ; CHECK-SAME: <2 x i64> [[BASE:%.*]]) {
@@ -229,6 +293,38 @@ exit:
   ret void
 }
 
+define void @ptr_iv_non_i8_type(ptr %base, i64 %end) {
+; CHECK-LABEL: define void @ptr_iv_non_i8_type(
+; CHECK-SAME: ptr [[BASE:%.*]], i64 [[END:%.*]]) {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br label [[LOOP:%.*]]
+; CHECK:       loop:
+; CHECK-NEXT:    [[IV_PTR:%.*]] = phi ptr [ [[IV_PTR_NEXT:%.*]], [[LOOP]] ], [ [[BASE]], [[ENTRY:%.*]] ]
+; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[LOOP]] ], [ 0, [[ENTRY]] ]
+; CHECK-NEXT:    call void @use.p0(ptr [[IV_PTR]])
+; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i64 [[IV]], 4
+; CHECK-NEXT:    [[IV_PTR_NEXT]] = getelementptr i32, ptr [[BASE]], i64 [[IV_NEXT]]
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i64 [[IV_NEXT]], [[END]]
+; CHECK-NEXT:    br i1 [[CMP]], label [[EXIT:%.*]], label [[LOOP]]
+; CHECK:       exit:
+; CHECK-NEXT:    ret void
+;
+entry:
+  br label %loop
+
+loop:
+  %iv.ptr = phi ptr [ %iv.ptr.next, %loop ], [ %base, %entry ]
+  %iv = phi i64 [ %iv.next, %loop ], [ 0, %entry ]
+  call void @use.p0(ptr %iv.ptr)
+  %iv.next = add nuw nsw i64 %iv, 4
+  %iv.ptr.next = getelementptr i32, ptr %base, i64 %iv.next
+  %cmp = icmp eq i64 %iv.next, %end
+  br i1 %cmp, label %exit, label %loop
+
+exit:
+  ret void
+}
+
 define void @ptr_iv_vector(<2 x ptr> %base, i64 %end) {
 ; CHECK-LABEL: define void @ptr_iv_vector(
 ; CHECK-SAME: <2 x ptr> [[BASE:%.*]], i64 [[END:%.*]]) {