InferAddressSpaces: Handle llvm.is.constant (#102010)

Author: arsenm

llvm/lib/Transforms/Scalar/InferAddressSpaces.cpp

@@ -401,7 +401,8 @@ bool InferAddressSpacesImpl::rewriteIntrinsicOperands(IntrinsicInst *II,
     II->setCalledFunction(NewDecl);
     return true;
   }
-  case Intrinsic::prefetch: {
+  case Intrinsic::prefetch:
+  case Intrinsic::is_constant: {
     Function *NewDecl =
         Intrinsic::getDeclaration(M, II->getIntrinsicID(), {NewV->getType()});
     II->setArgOperand(0, NewV);
@@ -429,6 +430,15 @@ void InferAddressSpacesImpl::collectRewritableIntrinsicOperands(
     appendsFlatAddressExpressionToPostorderStack(II->getArgOperand(0),
                                                  PostorderStack, Visited);
     break;
+  case Intrinsic::is_constant: {
+    Value *Ptr = II->getArgOperand(0);
+    if (Ptr->getType()->isPtrOrPtrVectorTy()) {
+      appendsFlatAddressExpressionToPostorderStack(Ptr, PostorderStack,
+                                                   Visited);
+    }
+
+    break;
+  }
   case Intrinsic::masked_load:
   case Intrinsic::masked_gather:
   case Intrinsic::prefetch:

llvm/test/Transforms/InferAddressSpaces/AMDGPU/is.constant.ll

@@ -0,0 +1,56 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt -S -mtriple=amdgcn-amd-amdhsa -passes=infer-address-spaces %s | FileCheck %s
+
+define i1 @is_constant_global_to_flat(ptr addrspace(1) %ptr) {
+; CHECK-LABEL: define i1 @is_constant_global_to_flat(
+; CHECK-SAME: ptr addrspace(1) [[PTR:%.*]]) {
+; CHECK-NEXT:    [[RET:%.*]] = call i1 @llvm.is.constant.p1(ptr addrspace(1) [[PTR]])
+; CHECK-NEXT:    ret i1 [[RET]]
+;
+  %cast = addrspacecast ptr addrspace(1) %ptr to ptr
+  %ret = call i1 @llvm.is.constant.p0(ptr %cast)
+  ret i1 %ret
+}
+
+define i1 @is_constant_local_to_flat(ptr addrspace(3) %ptr) {
+; CHECK-LABEL: define i1 @is_constant_local_to_flat(
+; CHECK-SAME: ptr addrspace(3) [[PTR:%.*]]) {
+; CHECK-NEXT:    [[RET:%.*]] = call i1 @llvm.is.constant.p3(ptr addrspace(3) [[PTR]])
+; CHECK-NEXT:    ret i1 [[RET]]
+;
+  %cast = addrspacecast ptr addrspace(3) %ptr to ptr
+  %ret = call i1 @llvm.is.constant.p0(ptr %cast)
+  ret i1 %ret
+}
+
+define i1 @is_constant_private_to_flat(ptr addrspace(5) %ptr) {
+; CHECK-LABEL: define i1 @is_constant_private_to_flat(
+; CHECK-SAME: ptr addrspace(5) [[PTR:%.*]]) {
+; CHECK-NEXT:    [[RET:%.*]] = call i1 @llvm.is.constant.p5(ptr addrspace(5) [[PTR]])
+; CHECK-NEXT:    ret i1 [[RET]]
+;
+  %cast = addrspacecast ptr addrspace(5) %ptr to ptr
+  %ret = call i1 @llvm.is.constant.p0(ptr %cast)
+  ret i1 %ret
+}
+
+define i1 @is_constant_private_to_flat_v2(<2 x ptr addrspace(5)> %ptr) {
+; CHECK-LABEL: define i1 @is_constant_private_to_flat_v2(
+; CHECK-SAME: <2 x ptr addrspace(5)> [[PTR:%.*]]) {
+; CHECK-NEXT:    [[RET:%.*]] = call i1 @llvm.is.constant.v2p5(<2 x ptr addrspace(5)> [[PTR]])
+; CHECK-NEXT:    ret i1 [[RET]]
+;
+  %cast = addrspacecast <2 x ptr addrspace(5)> %ptr to <2 x ptr>
+  %ret = call i1 @llvm.is.constant.v2p0(<2 x ptr> %cast)
+  ret i1 %ret
+}
+
+define i1 @is_constant_i32(i32 %val) {
+; CHECK-LABEL: define i1 @is_constant_i32(
+; CHECK-SAME: i32 [[VAL:%.*]]) {
+; CHECK-NEXT:    [[RET:%.*]] = call i1 @llvm.is.constant.i32(i32 [[VAL]])
+; CHECK-NEXT:    ret i1 [[RET]]
+;
+  %ret = call i1 @llvm.is.constant.i32(i32 %val)
+  ret i1 %ret
+}