• Type: Correctness / Copy-paste index bug
• Severity: Medium
• Component: GPU device capability initialization (SYCL)
• Location: Src/Base/AMReX_GpuDevice.cpp:568

Problem

In the SYCL initialization path, maxGridSize is assigned three times to index 0:

device_prop.maxGridSize[0] = -1;
device_prop.maxGridSize[0] = -1;
device_prop.maxGridSize[0] = -1;

Indices 1 and 2 are never explicitly assigned here.

Impact

• Directional limits become inconsistent (dir=1/dir=2 may keep default values).
• If maxBlocksPerGrid(1|2) is used, behavior can diverge from intended “unknown = -1” sentinel.

Suggested patch

--- a/Src/Base/AMReX_GpuDevice.cpp
+++ b/Src/Base/AMReX_GpuDevice.cpp
@@
-        device_prop.maxGridSize[0] = -1; // xxxxx SYCL todo: unknown
-        device_prop.maxGridSize[0] = -1; // unknown
-        device_prop.maxGridSize[0] = -1; // unknown
+        device_prop.maxGridSize[0] = -1; // xxxxx SYCL todo: unknown
+        device_prop.maxGridSize[1] = -1; // unknown
+        device_prop.maxGridSize[2] = -1; // unknown

Prepared by Codex