[AArch64][GlobalISel] Legalization and ISel support for load/stores of vectors of pointers.
Loads and store of values with type like <2 x p0> currently don't get imported
because SelectionDAG has no knowledge of pointer types. To leverage the existing
support for vector load/stores, we can bitcast the value to have s64 element
types instead. We do this as a custom legalization.
This patch also adds support for general loads of <2 x s64>, and relaxes some
type conditions on selecting G_BITCAST.
Differential Revision: https://reviews.llvm.org/D60534
llvm-svn: 358221
diff --git a/llvm/lib/Target/AArch64/AArch64InstructionSelector.cpp b/llvm/lib/Target/AArch64/AArch64InstructionSelector.cpp
index 45e5921..a756d6b 100644
--- a/llvm/lib/Target/AArch64/AArch64InstructionSelector.cpp
+++ b/llvm/lib/Target/AArch64/AArch64InstructionSelector.cpp
@@ -1658,11 +1658,10 @@
case TargetOpcode::G_BITCAST:
// Imported SelectionDAG rules can handle every bitcast except those that
// bitcast from a type to the same type. Ideally, these shouldn't occur
- // but we might not run an optimizer that deletes them.
- if (MRI.getType(I.getOperand(0).getReg()) ==
- MRI.getType(I.getOperand(1).getReg()))
- return selectCopy(I, TII, MRI, TRI, RBI);
- return false;
+ // but we might not run an optimizer that deletes them. The other exception
+ // is bitcasts involving pointer types, as SelectionDAG has no knowledge
+ // of them.
+ return selectCopy(I, TII, MRI, TRI, RBI);
case TargetOpcode::G_SELECT: {
if (MRI.getType(I.getOperand(1).getReg()) != LLT::scalar(1)) {