CallPromotionUtils: Correctly use IndexSize when determining the bit width of pointer offsets. (llvm#119483)

This reapplies llvm#119138 with a defensive fix for the assertion failure
when building libcxx.
Unfortunately the failure does not reproduce on my machine, so I am not
able to extract a test case.

The key insight for the fix comes from Jessica Clarke, who observes that
`VTablePtr` may, in fact,
not be a pointer on return from `FindAvailableLoadedValue`.

Co-authored-by: Alexander Richardson <[email protected]>

Author: resistor

llvm/lib/Transforms/Utils/CallPromotionUtils.cpp

@@ -692,14 +692,14 @@ bool llvm::tryPromoteCall(CallBase &CB) {
   if (!VTableEntryLoad)
     return false; // Not a vtable entry load.
   Value *VTableEntryPtr = VTableEntryLoad->getPointerOperand();
-  APInt VTableOffset(DL.getTypeSizeInBits(VTableEntryPtr->getType()), 0);
+  APInt VTableOffset(DL.getIndexTypeSizeInBits(VTableEntryPtr->getType()), 0);
   Value *VTableBasePtr = VTableEntryPtr->stripAndAccumulateConstantOffsets(
       DL, VTableOffset, /* AllowNonInbounds */ true);
   LoadInst *VTablePtrLoad = dyn_cast<LoadInst>(VTableBasePtr);
   if (!VTablePtrLoad)
     return false; // Not a vtable load.
   Value *Object = VTablePtrLoad->getPointerOperand();
-  APInt ObjectOffset(DL.getTypeSizeInBits(Object->getType()), 0);
+  APInt ObjectOffset(DL.getIndexTypeSizeInBits(Object->getType()), 0);
   Value *ObjectBase = Object->stripAndAccumulateConstantOffsets(
       DL, ObjectOffset, /* AllowNonInbounds */ true);
   if (!(isa<AllocaInst>(ObjectBase) && ObjectOffset == 0))
@@ -710,9 +710,9 @@ bool llvm::tryPromoteCall(CallBase &CB) {
   BasicBlock::iterator BBI(VTablePtrLoad);
   Value *VTablePtr = FindAvailableLoadedValue(
       VTablePtrLoad, VTablePtrLoad->getParent(), BBI, 0, nullptr, nullptr);
-  if (!VTablePtr)
+  if (!VTablePtr || !VTablePtr->getType()->isPointerTy())
     return false; // No vtable found.
-  APInt VTableOffsetGVBase(DL.getTypeSizeInBits(VTablePtr->getType()), 0);
+  APInt VTableOffsetGVBase(DL.getIndexTypeSizeInBits(VTablePtr->getType()), 0);
   Value *VTableGVBase = VTablePtr->stripAndAccumulateConstantOffsets(
       DL, VTableOffsetGVBase, /* AllowNonInbounds */ true);
   GlobalVariable *GV = dyn_cast<GlobalVariable>(VTableGVBase);

llvm/test/Transforms/Inline/promote-call-bitwidth.ll

@@ -0,0 +1,48 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --function-signature --scrub-attributes
+; RUN: opt -S -passes=inline < %s | FileCheck %s
+
+;; Check that we correctly use the index size when accumulating offsets during CallPromotion
+
+target datalayout = "p200:128:128:128:64-A200-P200-G200"
+
+define void @test(ptr addrspace(200) %arg1, ptr addrspace(200) %arg2) local_unnamed_addr addrspace(200) {
+; CHECK-LABEL: define {{[^@]+}}@test
+; CHECK-SAME: (ptr addrspace(200) [[ARG1:%.*]], ptr addrspace(200) [[ARG2:%.*]]) local_unnamed_addr addrspace(200) {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[TMP0:%.*]] = load ptr addrspace(200), ptr addrspace(200) [[ARG2]], align 16
+; CHECK-NEXT:    call addrspace(200) void [[TMP0]](ptr addrspace(200) [[ARG1]])
+; CHECK-NEXT:    ret void
+;
+entry:
+  call void @call_fnptr(ptr addrspace(200) %arg1, ptr addrspace(200) %arg2)
+  ret void
+}
+
+define internal void @call_fnptr(ptr addrspace(200) %this, ptr addrspace(200) %arg) unnamed_addr addrspace(200) align 2 {
+entry:
+  %0 = load ptr addrspace(200), ptr addrspace(200) %arg, align 16
+  call void %0(ptr addrspace(200) %this)
+  ret void
+}
+
+define void @test2(ptr addrspace(200) %this) local_unnamed_addr addrspace(200) {
+; CHECK-LABEL: define {{[^@]+}}@test2
+; CHECK-SAME: (ptr addrspace(200) [[THIS:%.*]]) local_unnamed_addr addrspace(200) {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[VTABLE_I:%.*]] = load ptr addrspace(200), ptr addrspace(200) [[THIS]], align 16
+; CHECK-NEXT:    [[FN_I:%.*]] = load ptr addrspace(200), ptr addrspace(200) [[VTABLE_I]], align 16
+; CHECK-NEXT:    call addrspace(200) void [[FN_I]](ptr addrspace(200) [[THIS]])
+; CHECK-NEXT:    ret void
+;
+entry:
+  call void @call_via_vtable(ptr addrspace(200) %this)
+  ret void
+}
+
+define internal void @call_via_vtable(ptr addrspace(200) %this) unnamed_addr addrspace(200) {
+entry:
+  %vtable = load ptr addrspace(200), ptr addrspace(200) %this, align 16
+  %fn = load ptr addrspace(200), ptr addrspace(200) %vtable, align 16
+  call void %fn(ptr addrspace(200) %this)
+  ret void
+}