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Fix PPC ABI for ByVal structs with vector members

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When a structure is passed by value, and that structure contains a vector
member, according to the PPC ABI, the structure will receive enhanced alignment
(so that the vector within the structure will always be aligned).

This should resolve PR16641.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190636 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel
2013-09-12 23:20:06 +00:00
parent 405b6503b3
commit 6671cd4db0
2 changed files with 113 additions and 9 deletions
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58
lib/Target/PowerPC/PPCISelLowering.cpp
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@@ -578,24 +578,48 @@ PPCTargetLowering::PPCTargetLowering(PPCTargetMachine &TM)
}
}
/// getMaxByValAlign - Helper for getByValTypeAlignment to determine
/// the desired ByVal argument alignment.
static void getMaxByValAlign(Type *Ty, unsigned &MaxAlign,
unsigned MaxMaxAlign) {
if (MaxAlign == MaxMaxAlign)
return;
if (VectorType *VTy = dyn_cast<VectorType>(Ty)) {
if (MaxMaxAlign >= 32 && VTy->getBitWidth() >= 256)
MaxAlign = 32;
else if (VTy->getBitWidth() >= 128 && MaxAlign < 16)
MaxAlign = 16;
} else if (ArrayType *ATy = dyn_cast<ArrayType>(Ty)) {
unsigned EltAlign = 0;
getMaxByValAlign(ATy->getElementType(), EltAlign, MaxMaxAlign);
if (EltAlign > MaxAlign)
MaxAlign = EltAlign;
} else if (StructType *STy = dyn_cast<StructType>(Ty)) {
for (unsigned i = 0, e = STy->getNumElements(); i != e; ++i) {
unsigned EltAlign = 0;
getMaxByValAlign(STy->getElementType(i), EltAlign, MaxMaxAlign);
if (EltAlign > MaxAlign)
MaxAlign = EltAlign;
if (MaxAlign == MaxMaxAlign)
break;
}
}
}
/// getByValTypeAlignment - Return the desired alignment for ByVal aggregate
/// function arguments in the caller parameter area.
unsigned PPCTargetLowering::getByValTypeAlignment(Type *Ty) const {
const TargetMachine &TM = getTargetMachine();
// Darwin passes everything on 4 byte boundary.
if (TM.getSubtarget<PPCSubtarget>().isDarwin())
if (PPCSubTarget.isDarwin())
return 4;
// 16byte and wider vectors are passed on 16byte boundary.
if (VectorType *VTy = dyn_cast<VectorType>(Ty))
if (VTy->getBitWidth() >= 128)
return 16;
// The rest is 8 on PPC64 and 4 on PPC32 boundary.
if (PPCSubTarget.isPPC64())
return 8;
return 4;
unsigned Align = PPCSubTarget.isPPC64() ? 8 : 4;
if (PPCSubTarget.hasAltivec() || PPCSubTarget.hasQPX())
getMaxByValAlign(Ty, Align, PPCSubTarget.hasQPX() ? 32 : 16);
return Align;
}
const char *PPCTargetLowering::getTargetNodeName(unsigned Opcode) const {
@@ -2281,6 +2305,13 @@ PPCTargetLowering::LowerFormalArguments_64SVR4(
InVals.push_back(FIN);
continue;
}
unsigned BVAlign = Flags.getByValAlign();
if (BVAlign > 8) {
ArgOffset = ((ArgOffset+BVAlign-1)/BVAlign)*BVAlign;
CurArgOffset = ArgOffset;
}
// All aggregates smaller than 8 bytes must be passed right-justified.
if (ObjSize < PtrByteSize)
CurArgOffset = CurArgOffset + (PtrByteSize - ObjSize);
@@ -3870,6 +3901,15 @@ PPCTargetLowering::LowerCall_64SVR4(SDValue Chain, SDValue Callee,
if (Size == 0)
continue;
unsigned BVAlign = Flags.getByValAlign();
if (BVAlign > 8) {
if (BVAlign % PtrByteSize != 0)
llvm_unreachable(
"ByVal alignment is not a multiple of the pointer size");
ArgOffset = ((ArgOffset+BVAlign-1)/BVAlign)*BVAlign;
}
// All aggregates smaller than 8 bytes must be passed right-justified.
if (Size==1 || Size==2 || Size==4) {
EVT VT = (Size==1) ? MVT::i8 : ((Size==2) ? MVT::i16 : MVT::i32);