Fix `Ptr::__subscript` to accept any integer index. (#4100)

* Fix `Ptr::__subscript` to accept any integer index.

* Fix `Ptr::__subscript` to allow 64bit indices.

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/spirv/ptr-subscript.slang b/tests/spirv/ptr-subscript.slang
new file mode 100644
index 000000000..0b30fe98e
--- /dev/null
+++ b/tests/spirv/ptr-subscript.slang
@@ -0,0 +1,12 @@
+//TEST:SIMPLE(filecheck=CHECK): -target spirv -entry main -stage compute -emit-spirv-directly
+
+// CHECK: OpEntryPoint
+
+ConstantBuffer<Ptr<int>> cbPtr;
+void main(int id : SV_DispatchThreadID)
+{
+    // Check that the index operand is translated directly into a 64bit integer
+    // in th resulting SPIR-V without any truncations.
+    // CHECK: OpPtrAccessChain %_ptr_PhysicalStorageBuffer_int %{{.*}} %long_123
+    cbPtr[123ll] = 4;
+}