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R600/SI: dynamical figure out the reg class of MIMG

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Depending on the number of bits set in the writemask.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179166 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Christian Konig 2013-04-10 08:39:16 +00:00
parent 84a775d8e3
commit 4d0e8a8a3e
7 changed files with 78 additions and 17 deletions
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3
lib/Target/R600/AMDGPUAsmPrinter.cpp
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@ -107,6 +107,9 @@ void AMDGPUAsmPrinter::EmitProgramInfo(MachineFunction &MF) {
} else if (AMDGPU::VReg_64RegClass.contains(reg)) {
isSGPR = false;
width = 2;
} else if (AMDGPU::VReg_96RegClass.contains(reg)) {
isSGPR = false;
width = 3;
} else if (AMDGPU::SReg_128RegClass.contains(reg)) {
isSGPR = true;
width = 4;

39
lib/Target/R600/SIISelLowering.cpp
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@ -720,7 +720,7 @@ unsigned SubIdx2Lane(unsigned Idx) {
void SITargetLowering::adjustWritemask(MachineSDNode *&Node,
SelectionDAG &DAG) const {
SDNode *Users[4] = { };
unsigned Writemask = 0;
unsigned Writemask = 0, Lane = 0;
// Try to figure out the used register components
for (SDNode::use_iterator I = Node->use_begin(), E = Node->use_end();
@ -731,7 +731,7 @@ void SITargetLowering::adjustWritemask(MachineSDNode *&Node,
I->getMachineOpcode() != TargetOpcode::EXTRACT_SUBREG)
return;
unsigned Lane = SubIdx2Lane(I->getConstantOperandVal(1));
Lane = SubIdx2Lane(I->getConstantOperandVal(1));
// Abort if we have more than one user per component
if (Users[Lane])
@ -752,6 +752,16 @@ void SITargetLowering::adjustWritemask(MachineSDNode *&Node,
Ops.push_back(Node->getOperand(i));
Node = (MachineSDNode*)DAG.UpdateNodeOperands(Node, Ops.data(), Ops.size());
// If we only got one lane, replace it with a copy
if (Writemask == (1U << Lane)) {
SDValue RC = DAG.getTargetConstant(AMDGPU::VReg_32RegClassID, MVT::i32);
SDNode *Copy = DAG.getMachineNode(TargetOpcode::COPY_TO_REGCLASS,
DebugLoc(), MVT::f32,
SDValue(Node, 0), RC);
DAG.ReplaceAllUsesWith(Users[Lane], Copy);
return;
}
// Update the users of the node with the new indices
for (unsigned i = 0, Idx = AMDGPU::sub0; i < 4; ++i) {
@ -780,3 +790,28 @@ SDNode *SITargetLowering::PostISelFolding(MachineSDNode *Node,
return foldOperands(Node, DAG);
}
/// \brief Assign the register class depending on the number of
/// bits set in the writemask
void SITargetLowering::AdjustInstrPostInstrSelection(MachineInstr *MI,
SDNode *Node) const {
if (AMDGPU::isMIMG(MI->getOpcode()) == -1)
return;
unsigned VReg = MI->getOperand(0).getReg();
unsigned Writemask = MI->getOperand(1).getImm();
unsigned BitsSet = 0;
for (unsigned i = 0; i < 4; ++i)
BitsSet += Writemask & (1 << i) ? 1 : 0;
const TargetRegisterClass *RC;
switch (BitsSet) {
default: return;
case 1: RC = &AMDGPU::VReg_32RegClass; break;
case 2: RC = &AMDGPU::VReg_64RegClass; break;
case 3: RC = &AMDGPU::VReg_96RegClass; break;
}
MachineRegisterInfo &MRI = MI->getParent()->getParent()->getRegInfo();
MRI.setRegClass(VReg, RC);
}

2
lib/Target/R600/SIISelLowering.h
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@ -53,6 +53,8 @@ public:
virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const;
virtual SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
virtual SDNode *PostISelFolding(MachineSDNode *N, SelectionDAG &DAG) const;
virtual void AdjustInstrPostInstrSelection(MachineInstr *MI,
SDNode *Node) const;
int32_t analyzeImmediate(const SDNode *N) const;
};

9
lib/Target/R600/SIInstrInfo.cpp
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@ -58,6 +58,10 @@ SIInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
AMDGPU::sub0, AMDGPU::sub1, AMDGPU::sub2, AMDGPU::sub3, 0
};
const int16_t Sub0_2[] = {
AMDGPU::sub0, AMDGPU::sub1, AMDGPU::sub2, 0
};
const int16_t Sub0_1[] = {
AMDGPU::sub0, AMDGPU::sub1, 0
};
@ -125,6 +129,11 @@ SIInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
Opcode = AMDGPU::V_MOV_B32_e32;
SubIndices = Sub0_1;
} else if (AMDGPU::VReg_96RegClass.contains(DestReg)) {
assert(AMDGPU::VReg_96RegClass.contains(SrcReg));
Opcode = AMDGPU::V_MOV_B32_e32;
SubIndices = Sub0_2;
} else if (AMDGPU::VReg_128RegClass.contains(DestReg)) {
assert(AMDGPU::VReg_128RegClass.contains(SrcReg) ||
AMDGPU::SReg_128RegClass.contains(SrcReg));

2
lib/Target/R600/SIInstrInfo.td
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@ -346,6 +346,7 @@ class MIMG_Load_Helper <bits<7> op, string asm> : MIMG <
[]> {
let mayLoad = 1;
let mayStore = 0;
let hasPostISelHook = 1;
}
//===----------------------------------------------------------------------===//
@ -379,6 +380,7 @@ def getCommuteOrig : InstrMapping {
let ValueCols = [["1"]];
}
// Test if the supplied opcode is an MIMG instruction
def isMIMG : InstrMapping {
let FilterClass = "MIMG_Load_Helper";
let RowFields = ["Inst"];

10
lib/Target/R600/SIRegisterInfo.td
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@ -94,6 +94,12 @@ def VGPR_64 : RegisterTuples<[sub0, sub1],
[(add (trunc VGPR_32, 255)),
(add (shl VGPR_32, 1))]>;
// VGPR 96-bit registers
def VGPR_96 : RegisterTuples<[sub0, sub1, sub2],
[(add (trunc VGPR_32, 254)),
(add (shl VGPR_32, 1)),
(add (shl VGPR_32, 2))]>;
// VGPR 128-bit registers
def VGPR_128 : RegisterTuples<[sub0, sub1, sub2, sub3],
[(add (trunc VGPR_32, 253)),
@ -162,6 +168,10 @@ def VReg_32 : RegisterClass<"AMDGPU", [i32, f32, v1i32], 32, (add VGPR_32)>;
def VReg_64 : RegisterClass<"AMDGPU", [i64, f64, v2i32, v2f32], 64, (add VGPR_64)>;
def VReg_96 : RegisterClass<"AMDGPU", [untyped], 96, (add VGPR_96)> {
let Size = 96;
}
def VReg_128 : RegisterClass<"AMDGPU", [v4i32, v4f32], 128, (add VGPR_128)>;
def VReg_256 : RegisterClass<"AMDGPU", [v8i32, v8f32], 256, (add VGPR_256)>;

30
test/CodeGen/R600/llvm.SI.sample.ll
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@ -1,21 +1,21 @@
;RUN: llc < %s -march=r600 -mcpu=verde | FileCheck %s
;CHECK: IMAGE_SAMPLE {{VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+}}, 15
;CHECK: IMAGE_SAMPLE {{VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+}}, 3
;CHECK: IMAGE_SAMPLE {{VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+}}, 2
;CHECK: IMAGE_SAMPLE {{VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+}}, 1
;CHECK: IMAGE_SAMPLE {{VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+}}, 4
;CHECK: IMAGE_SAMPLE {{VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+}}, 8
;CHECK: IMAGE_SAMPLE_C {{VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+}}, 5
;CHECK: IMAGE_SAMPLE_C {{VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+}}, 9
;CHECK: IMAGE_SAMPLE_C {{VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+}}, 6
;CHECK: IMAGE_SAMPLE {{VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+}}, 10
;CHECK: IMAGE_SAMPLE {{VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+}}, 12
;CHECK: IMAGE_SAMPLE_C {{VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+}}, 7
;CHECK: IMAGE_SAMPLE_C {{VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+}}, 11
;CHECK: IMAGE_SAMPLE_C {{VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+}}, 13
;CHECK: IMAGE_SAMPLE {{VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+}}, 14
;CHECK: IMAGE_SAMPLE {{VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+}}, 8
;CHECK: IMAGE_SAMPLE {{VGPR[0-9]+_VGPR[0-9]+}}, 3
;CHECK: IMAGE_SAMPLE {{VGPR[0-9]+}}, 2
;CHECK: IMAGE_SAMPLE {{VGPR[0-9]+}}, 1
;CHECK: IMAGE_SAMPLE {{VGPR[0-9]+}}, 4
;CHECK: IMAGE_SAMPLE {{VGPR[0-9]+}}, 8
;CHECK: IMAGE_SAMPLE_C {{VGPR[0-9]+_VGPR[0-9]+}}, 5
;CHECK: IMAGE_SAMPLE_C {{VGPR[0-9]+_VGPR[0-9]+}}, 9
;CHECK: IMAGE_SAMPLE_C {{VGPR[0-9]+_VGPR[0-9]+}}, 6
;CHECK: IMAGE_SAMPLE {{VGPR[0-9]+_VGPR[0-9]+}}, 10
;CHECK: IMAGE_SAMPLE {{VGPR[0-9]+_VGPR[0-9]+}}, 12
;CHECK: IMAGE_SAMPLE_C {{VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+}}, 7
;CHECK: IMAGE_SAMPLE_C {{VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+}}, 11
;CHECK: IMAGE_SAMPLE_C {{VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+}}, 13
;CHECK: IMAGE_SAMPLE {{VGPR[0-9]+_VGPR[0-9]+_VGPR[0-9]+}}, 14
;CHECK: IMAGE_SAMPLE {{VGPR[0-9]+}}, 8
define void @test(i32 %a1, i32 %a2, i32 %a3, i32 %a4) {
%v1 = insertelement <4 x i32> undef, i32 %a1, i32 0