[GVN] Add ptrtoaddr test (NFC)

Author: nikic

llvm/test/Transforms/GVN/ptrtoaddr.ll

@@ -0,0 +1,32 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
+; RUN: opt -S -passes=gvn < %s | FileCheck %s
+
+define i64 @ptrtoaddr_same(ptr %p) {
+; CHECK-LABEL: define i64 @ptrtoaddr_same(
+; CHECK-SAME: ptr [[P:%.*]]) {
+; CHECK-NEXT:    [[I:%.*]] = ptrtoaddr ptr [[P]] to i64
+; CHECK-NEXT:    [[J:%.*]] = ptrtoaddr ptr [[P]] to i64
+; CHECK-NEXT:    [[SUB:%.*]] = sub i64 [[I]], [[J]]
+; CHECK-NEXT:    ret i64 [[SUB]]
+;
+  %i = ptrtoaddr ptr %p to i64
+  %j = ptrtoaddr ptr %p to i64
+  %sub = sub i64 %i, %j
+  ret i64 %sub
+}
+
+; Note that unlike for ptrtoint, it's not possible for ptrtoaddr to differ
+; in result type for the same input.
+define i64 @ptrtoaddr_different(ptr %p, ptr %p2) {
+; CHECK-LABEL: define i64 @ptrtoaddr_different(
+; CHECK-SAME: ptr [[P:%.*]], ptr [[P2:%.*]]) {
+; CHECK-NEXT:    [[I:%.*]] = ptrtoaddr ptr [[P]] to i64
+; CHECK-NEXT:    [[J:%.*]] = ptrtoaddr ptr [[P2]] to i64
+; CHECK-NEXT:    [[SUB:%.*]] = sub i64 [[I]], [[J]]
+; CHECK-NEXT:    ret i64 [[SUB]]
+;
+  %i = ptrtoaddr ptr %p to i64
+  %j = ptrtoaddr ptr %p2 to i64
+  %sub = sub i64 %i, %j
+  ret i64 %sub
+}