From 14412ef07afefdb7711ed402dd80c3e08af95525 Mon Sep 17 00:00:00 2001 From: Krzysztof Parzyszek Date: Mon, 18 Jul 2016 17:36:46 +0000 Subject: [PATCH] [Hexagon] Handle returning small structures by value This is not compliant with the official ABI, but allows experimentation with calling conventions. llvm-svn: 275825 --- llvm/lib/Target/Hexagon/HexagonISelLowering.cpp | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp b/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp index 2a5d7d4..cdd4c2f 100644 --- a/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp +++ b/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp @@ -447,7 +447,13 @@ static bool RetCC_Hexagon32(unsigned ValNo, MVT ValVT, MVT LocVT, CCValAssign::LocInfo LocInfo, ISD::ArgFlagsTy ArgFlags, CCState &State) { if (LocVT == MVT::i32 || LocVT == MVT::f32) { - if (unsigned Reg = State.AllocateReg(Hexagon::R0)) { + // Note that use of registers beyond R1 is not ABI compliant. However there + // are (experimental) IR passes which generate internal functions that + // return structs using these additional registers. + static const uint16_t RegList[] = { Hexagon::R0, Hexagon::R1, + Hexagon::R2, Hexagon::R3, + Hexagon::R4, Hexagon::R5}; + if (unsigned Reg = State.AllocateReg(RegList)) { State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo)); return false; } -- 2.7.4