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[Hexagon] Handle returning small structures by value 

This is not compliant with the official ABI, but allows experimentation
with calling conventions.

llvm-svn: 275825
This commit is contained in:
Krzysztof Parzyszek 2016-07-18 17:36:46 +00:00
parent 4661a958d8
commit 14412ef07a
1 changed files with 7 additions and 1 deletions
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8
llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
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@ -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;
}