================
@@ -683,6 +698,65 @@ struct AAAMDAttributesFunction : public AAAMDAttributes {
return !A.checkForAllCallLikeInstructions(DoesNotRetrieve, *this,
UsedAssumedInformation);
}
+
+ // Returns true if FlatScratchInit is needed, i.e., no-flat-scratch-init is
+ // not to be set.
+ bool needFlatScratchInit(Attributor &A) {
+ assert(isAssumed(FLAT_SCRATCH_INIT)); // only called if the bit is still
set
+
+ // Check all AddrSpaceCast instructions. FlatScratchInit is needed if
+ // there is a cast from PRIVATE_ADDRESS.
+ auto AddrSpaceCastNotFromPrivate = [](Instruction &I) {
+ return cast<AddrSpaceCastInst>(I).getSrcAddressSpace() !=
+ AMDGPUAS::PRIVATE_ADDRESS;
+ };
+
+ bool UsedAssumedInformation = false;
+ if (!A.checkForAllInstructions(AddrSpaceCastNotFromPrivate, *this,
+ {Instruction::AddrSpaceCast},
+ UsedAssumedInformation))
+ return true;
+
+ // Check for addrSpaceCast from PRIVATE_ADDRESS in constant expressions
+ auto &InfoCache = static_cast<AMDGPUInformationCache &>(A.getInfoCache());
+
+ Function *F = getAssociatedFunction();
+ for (Instruction &I : instructions(F)) {
+ for (const Use &U : I.operands()) {
+ if (const auto *C = dyn_cast<Constant>(U)) {
+ if (InfoCache.checkConstForAddrSpaceCastFromPrivate(C))
+ return true;
+ }
+ }
+ }
+
+ // Finally check callees.
+
+ // This is called on each callee; false means callee shouldn't have
+ // no-flat-scratch-init.
+ auto CheckForNoFlatScratchInit = [&](Instruction &I) {
+ const auto &CB = cast<CallBase>(I);
+ const Function *Callee = CB.getCalledFunction();
+
+ // Callee == 0 for inline asm or indirect call with known callees.
+ // In the latter case, updateImpl() already checked the callees and we
+ // know their FLAT_SCRATCH_INIT bit is set.
+ // If function has indirect call with unknown callees, the bit is
+ // already removed in updateImpl() and execution won't reach here.
+ if (!Callee)
+ return true;
+
+ return Callee->getIntrinsicID() !=
----------------
shiltian wrote:
IIUC, this attribute should propagate from callee to caller, so you will need
to check all function calls, and ask Attributor whether the callee needs it or
not.
https://github.com/llvm/llvm-project/pull/94647
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