Automerge: [GVNSink] Add support for ptrtoaddr

Author: nikic

llvm/lib/Transforms/Scalar/GVNSink.cpp

@@ -430,6 +430,7 @@ class ValueTable {
     case Instruction::FPTrunc:
     case Instruction::FPExt:
     case Instruction::PtrToInt:
+    case Instruction::PtrToAddr:
     case Instruction::IntToPtr:
     case Instruction::BitCast:
     case Instruction::AddrSpaceCast:

llvm/test/Transforms/GVNSink/ptrtoaddr.ll

@@ -0,0 +1,30 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
+; RUN: opt -S -passes=gvn-sink < %s | FileCheck %s
+
+define i64 @test(i1 %c, ptr %p, ptr %p2) {
+; CHECK-LABEL: define i64 @test(
+; CHECK-SAME: i1 [[C:%.*]], ptr [[P:%.*]], ptr [[P2:%.*]]) {
+; CHECK-NEXT:    br i1 [[C]], label %[[IF:.*]], label %[[ELSE:.*]]
+; CHECK:       [[IF]]:
+; CHECK-NEXT:    br label %[[JOIN:.*]]
+; CHECK:       [[ELSE]]:
+; CHECK-NEXT:    br label %[[JOIN]]
+; CHECK:       [[JOIN]]:
+; CHECK-NEXT:    [[P2_SINK:%.*]] = phi ptr [ [[P2]], %[[ELSE]] ], [ [[P]], %[[IF]] ]
+; CHECK-NEXT:    [[PHI:%.*]] = ptrtoaddr ptr [[P2_SINK]] to i64
+; CHECK-NEXT:    ret i64 [[PHI]]
+;
+  br i1 %c, label %if, label %else
+
+if:
+  %p.addr = ptrtoaddr ptr %p to i64
+  br label %join
+
+else:
+  %p2.addr = ptrtoaddr ptr %p2 to i64
+  br label %join
+
+join:
+  %phi = phi i64 [ %p.addr, %if ], [ %p2.addr, %else ]
+  ret i64 %phi
+}