================
@@ -54,10 +54,41 @@ class CommonSPIRTargetCIRGenInfo : public TargetCIRGenInfo {
ft = getABIInfo().cgt.getASTContext().adjustFunctionType(
ft, ft->getExtInfo().withCallingConv(CC_DeviceKernel));
}
+
+ mlir::Value getNullPointer(CIRGenModule &cgm, cir::PointerType ptrTy,
+ QualType qt, mlir::Location loc) const override;
};
} // namespace
+// The bit pattern of null in non-generic AS is unspecified for SPIR(-V), so
+// materialize it via an address space cast from null in generic AS.
+mlir::Value
+CommonSPIRTargetCIRGenInfo::getNullPointer(CIRGenModule &cgm,
+ cir::PointerType ptrTy, QualType qt,
+ mlir::Location loc) const {
+ LangAS as = qt->getUnqualifiedDesugaredType()->isNullPtrType()
+ ? LangAS::Default
+ : qt->getPointeeType().getAddressSpace();
+ unsigned asAsInt = static_cast<unsigned>(as);
+ unsigned firstTargetASAsInt =
+ static_cast<unsigned>(LangAS::FirstTargetAddressSpace);
+ unsigned codeSectionINTELAS = firstTargetASAsInt + 9;
----------------
steffenlarsen wrote:
At least the `constexpr` tells a more of a story. Thanks!
https://github.com/llvm/llvm-project/pull/228559
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