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R600: Enable folding of inline literals into REQ_SEQUENCE instructions 

Tested-by: Aaron Watry <awatry@gmail.com>
llvm-svn: 188517
This commit is contained in:
Tom Stellard 2013-08-16 01:11:55 +00:00
parent 676c16d088
commit 16da74c205
3 changed files with 36 additions and 17 deletions
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37
llvm/lib/Target/R600/AMDGPUISelDAGToDAG.cpp
View File

@ -453,29 +453,32 @@ SDNode *AMDGPUDAGToDAGISel::Select(SDNode *N) {
continue;
}
} else {
if (!TII->isALUInstr(Use->getMachineOpcode()) ||
(TII->get(Use->getMachineOpcode()).TSFlags &
R600_InstFlag::VECTOR)) {
continue;
}
int ImmIdx = TII->getOperandIdx(Use->getMachineOpcode(),
AMDGPU::OpName::literal);
if (ImmIdx == -1) {
continue;
}
if (TII->getOperandIdx(Use->getMachineOpcode(),
AMDGPU::OpName::dst) != -1) {
// subtract one from ImmIdx, because the DST operand is usually index
// 0 for MachineInstrs, but we have no DST in the Ops vector.
ImmIdx--;
switch(Use->getMachineOpcode()) {
case AMDGPU::REG_SEQUENCE: break;
default:
if (!TII->isALUInstr(Use->getMachineOpcode()) ||
(TII->get(Use->getMachineOpcode()).TSFlags &
R600_InstFlag::VECTOR)) {
continue;
}
}
// Check that we aren't already using an immediate.
// XXX: It's possible for an instruction to have more than one
// immediate operand, but this is not supported yet.
if (ImmReg == AMDGPU::ALU_LITERAL_X) {
int ImmIdx = TII->getOperandIdx(Use->getMachineOpcode(),
AMDGPU::OpName::literal);
if (ImmIdx == -1) {
continue;
}
if (TII->getOperandIdx(Use->getMachineOpcode(),
AMDGPU::OpName::dst) != -1) {
// subtract one from ImmIdx, because the DST operand is usually index
// 0 for MachineInstrs, but we have no DST in the Ops vector.
ImmIdx--;
}
ConstantSDNode *C = dyn_cast<ConstantSDNode>(Use->getOperand(ImmIdx));
assert(C);

3
llvm/lib/Target/R600/R600OptimizeVectorRegisters.cpp
View File

@ -50,6 +50,9 @@ isImplicitlyDef(MachineRegisterInfo &MRI, unsigned Reg) {
E = MRI.def_end(); It != E; ++It) {
return (*It).isImplicitDef();
}
if (MRI.isReserved(Reg)) {
return false;
}
llvm_unreachable("Reg without a def");
return false;
}

13
llvm/test/CodeGen/R600/literals.ll
View File

@ -31,3 +31,16 @@ entry:
store float %0, float addrspace(1)* %out
ret void
}
; Make sure inline literals are folded into REG_SEQUENCE instructions.
; CHECK: @inline_literal_reg_sequence
; CHECK: MOV T[[GPR:[0-9]]].X, 0.0
; CHECK-NEXT: MOV T[[GPR]].Y, 0.0
; CHECK-NEXT: MOV T[[GPR]].Z, 0.0
; CHECK-NEXT: MOV * T[[GPR]].W, 0.0
define void @inline_literal_reg_sequence(<4 x i32> addrspace(1)* %out) {
entry:
store <4 x i32> <i32 0, i32 0, i32 0, i32 0>, <4 x i32> addrspace(1)* %out
ret void
}