https://bugs.llvm.org/show_bug.cgi?id=44177
Bug ID: 44177
Summary: Constexpr array not seen as constexpr
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: OpenCL
Assignee: unassignedclangb...@nondot.org
Reporter: dr...@jwdt.org
CC: anastasia.stul...@arm.com, llvm-bugs@lists.llvm.org
Created attachment 22880
--> https://bugs.llvm.org/attachment.cgi?id=22880&action=edit
Testcase
The attached code (which works correctly with standard C++, and also with CUDA)
fails in OpenCL because the constexpr array zSize is not interpreted as
constexpr.
Command to reproduce:
clang++ -cl-std=clc++ -Xclang -finclude-default-header -o test test2.cl
Error message:
test2.cl:54:57: error: constexpr function never produces a constant expression
[-Winvalid-constexpr]
GPU_HOST_DEVICE constexpr GPUArray<float, LayersNumber> InverseZBinSize()
^
test2.cl:57:57: note: subexpression not valid in a constant expression
return GPUArray<float, LayersNumber>{{0.5f * ZBins / (zSize[0]), 0.5f * ZBins
/ (zSize[1]), 0.5f * ZBins / (zSize[2]),
--
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