Lowering long vector returns fails.

[llvmbot]

Bugzilla Link	27161
Version	trunk
OS	Linux
Reporter	LLVM Bugzilla Contributor

Extended Description

To recreae: Compile the following with
llc -march=sparc .ll

define <8 x i8> @&#8203;fun8_2(<8 x i8> %a, <8 x i8> %b) {
entry:
  %and = and <8 x i8> %b, %a
  ret <8 x i8> %and
}

Expected result: Compiles well, returning some results on the stack as there are too many results (8 in the vector) to return in output registers.

Actual result: Fails. Tries to return all results in output registers and runs out of registers.

Important part of stack trace:

8  libLLVMCodeGen.so      0x00007f4ce1f5f47d llvm::CCState::AnalyzeReturn(llvm::SmallVectorImpl<llvm::ISD::OutputArg> const&, bool (*)(unsigned int, llvm::MVT, llvm::MVT, llvm::CCValAssign::LocInfo, llvm::ISD::ArgFlagsTy, llvm::CCState&)) + 683
9  libLLVMSparcCodeGen.so 0x00007f4ce40bcda4 llvm::SparcTargetLowering::LowerReturn_32(llvm::SDValue, unsigned int, bool, llvm::SmallVectorImpl<llvm::ISD::OutputArg> const&, llvm::SmallVectorImpl<llvm::SDValue> const&, llvm::SDLoc, llvm::SelectionDAG&) const + 222

[brad0]

@koachan Is just me or has this been resolved with ToT?

[koachan]

This (and #48042) seems to be fixed already in latest main.

https://godbolt.org/z/b3r8TYz6z

[koachan]

@koachan Is just me or has this been resolved with ToT?

I think it's this patch? https://reviews.llvm.org/D132465
I wasn't aware that it also affects this case too back then, I'm sorry.

[brad0]

I think it's this patch? https://reviews.llvm.org/D132465 I wasn't aware that it also affects this case too back then, I'm sorry.

Absolutely nothing to be sorry about. It's just good to try and clear out the bug reports. Take note of what issues have been resolved and what issues still affect the backend. Thank you for your effort.