[SVE] Reject vector struct indexes for scalable vectors.

It's messy to pattern-match, and completely unnecessary: scalar indexes
work equally well.

See also discussion on D81620 and D82061.

Differential Revision: https://reviews.llvm.org/D82430

diff --git a/llvm/lib/IR/Type.cpp b/llvm/lib/IR/Type.cpp
index bb077c1..d869a6e 100644 (file)
--- a/llvm/lib/IR/Type.cpp
+++ b/llvm/lib/IR/Type.cpp
@@ -548,6 +548,8 @@ bool StructType::indexValid(const Value *V) const {
   // vector case all of the indices must be equal.
   if (!V->getType()->isIntOrIntVectorTy(32))
     return false;
+  if (isa<ScalableVectorType>(V->getType()))
+    return false;
   const Constant *C = dyn_cast<Constant>(V);
   if (C && V->getType()->isVectorTy())
     C = C->getSplatValue();

diff --git a/llvm/test/Assembler/getelementptr_vscale_struct.ll b/llvm/test/Assembler/getelementptr_vscale_struct.ll
new file mode 100644 (file)
index 0000000..c6b592c
--- /dev/null
+++ b/llvm/test/Assembler/getelementptr_vscale_struct.ll
@@ -0,0 +1,10 @@
+; RUN: not llvm-as < %s >/dev/null 2> %t
+; RUN: FileCheck %s < %t
+; Test that a scalable vector struct index is rejected.
+
+; CHECK: invalid getelementptr indices
+
+define <vscale x 2 x i32*> @test7(<vscale x 2 x {i32, i32}*> %a) {
+  %w = getelementptr {i32, i32}, <vscale x 2 x {i32, i32}*> %a, <vscale x 2 x i32> zeroinitializer, <vscale x 2 x i32> zeroinitializer
+  ret <vscale x 2 x i32*> %w
+}