[llvm-dev] Issues matching branch instruction using TableGen pattern
Simon de Vegt via llvm-dev
llvm-dev at lists.llvm.org
Mon Feb 8 10:47:56 PST 2021
Legend,
This was indeed the issue. Thanks a lot!
Met vriendelijke groet / Kind regards,
Simon de Vegt
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From: Craig Topper <craig.topper at gmail.com>
Sent: maandag 8 februari 2021 18:26
To: Simon de Vegt <simon.de.vegt at prodrive-technologies.com>
Cc: llvm-dev at lists.llvm.org
Subject: Re: [llvm-dev] Issues matching branch instruction using TableGen pattern
The SNPHasChain increased all the child numbers. A node with a chain should have a MVT::Other chain value as the first operand.
Is that operand missing when you called getNode?
On Mon, Feb 8, 2021 at 3:30 AM Simon de Vegt via llvm-dev <llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>> wrote:
Hello everybody,
I am working on an out of tree backend for my master thesis. However I am currently stuck with the following issue:
I have this branch instruction which I tried to match with a pattern, however it somehow fails, I tried to expand the patterns to include everything I could think of, both matching the register classes used (which are all f32) and fpconstants as well. I think somehow the operands are screwed as it fails on child2 which is, if numbered from 0 the jump address. But I have no idea what is going wrong or how to debug this further.
Thanks for taking the time to read this and possibly have a look.
//////////// Relevant SOURCE & OUTPUT //////////////
The relevant tablegen looks like this:
def SDT_PDCPUFBGT2 : SDTypeProfile<0, 3, []>;
def PDFBGT : SDNode<"PDCPUISD::FBGT", SDT_PDCPUFBGT2, [SDNPHasChain]>;
// Control
let hasSideEffects = 0, mayLoad = 0, mayStore = 0, isBranch = 1, isTerminator = 1 in
def FBGT : PDInstR<OPC_FBGT.Value, (outs), (ins GPR:$op1, GPR:$op2, jmptarget:$addr),
"fbgt", "$op1, $op2, $addr"> {
let res = -1;
}
// GPR
def : Pat<(PDFBGT GPR:$op1, GPR:$op2, bb:$dest), (FBGT $op1, $op2, $dest)>;
def : Pat<(PDFBGT fpimm:$op1, GPR:$op2, bb:$dest), (FBGT $op1, $op2, $dest)>;
def : Pat<(PDFBGT GPR:$op1, fpimm:$op2, bb:$dest), (FBGT $op1, $op2, $dest)>;
def : Pat<(PDFBGT fpimm:$op1, fpimm:$op2, bb:$dest), (FBGT $op1, $op2, $dest)>;
// GPRS
def : Pat<(PDFBGT GPRS:$op1, GPRS:$op2, bb:$dest), (FBGT $op1, $op2, $dest)>;
def : Pat<(PDFBGT fpimm:$op1, GPRS:$op2, bb:$dest), (FBGT $op1, $op2, $dest)>;
def : Pat<(PDFBGT GPRS:$op1, fpimm:$op2, bb:$dest), (FBGT $op1, $op2, $dest)>;
def : Pat<(PDFBGT fpimm:$op1, fpimm:$op2, bb:$dest), (FBGT $op1, $op2, $dest)>;
// GPRI
def : Pat<(PDFBGT GPRI:$op1, GPRI:$op2, bb:$dest), (FBGT $op1, $op2, $dest)>;
def : Pat<(PDFBGT fpimm:$op1, GPRI:$op2, bb:$dest), (FBGT $op1, $op2, $dest)>;
def : Pat<(PDFBGT GPRI:$op1, fpimm:$op2, bb:$dest), (FBGT $op1, $op2, $dest)>;
def : Pat<(PDFBGT fpimm:$op1, fpimm:$op2, bb:$dest), (FBGT $op1, $op2, $dest)>;
// GPRC
def : Pat<(PDFBGT GPRC:$op1, GPRC:$op2, bb:$dest), (FBGT $op1, $op2, $dest)>;
def : Pat<(PDFBGT fpimm:$op1, GPRC:$op2, bb:$dest), (FBGT $op1, $op2, $dest)>;
def : Pat<(PDFBGT GPRC:$op1, fpimm:$op2, bb:$dest), (FBGT $op1, $op2, $dest)>;
def : Pat<(PDFBGT fpimm:$op1, fpimm:$op2, bb:$dest), (FBGT $op1, $op2, $dest)>;
The failing match is described below, note all the places where a match failed because of the added statements.
ISEL: Starting selection on root node: t26: ch,glue = PDCPUISD::FBGT [ORD=4] [ID=7] # D:0 t7, ConstantFP:f32<0.000000e+00> [ID=2], BasicBlock:ch<if.end245 0x557a41f51c80> [ID=3] # D:0, ./XXX/CurrentController.c:68:7
ISEL: Starting pattern match
Initial Opcode index to 99
Match failed at index 112
Continuing at 131
Match failed at index 132
Continuing at 149
Continuing at 150
Match failed at index 155
Continuing at 174
Match failed at index 181
Continuing at 198
Match failed at index 203
Continuing at 222
Match failed at index 229
Continuing at 246
Match failed at index 251
Continuing at 270
Match failed at index 277
Continuing at 294
Match failed at index 301
Continuing at 320
Match failed at index 321
Continuing at 338
Continuing at 339
LLVM ERROR: Cannot select: t26: ch,glue = PDCPUISD::FBGT [ORD=4] [ID=7] # D:0 t7, ConstantFP:f32<0.000000e+00> [ID=2], BasicBlock:ch<if.end245 0x557a41f51c80> [ID=3] # D:0, ./XXX/CurrentController.c:68:7
t7: f32,ch = load<(dereferenceable load 4 from `float* getelementptr inbounds (%struct.tag_RTM_CurrentController_T, %struct.tag_RTM_CurrentController_T* @CurrentController_M_, i64 0, i32 1, i32 0, i32 0, i64 1)`, align 8, !tbaa !127)> [ORD=2] [ID=6] # D:0 t0, TargetGlobalAddress:i32<%struct.tag_RTM_CurrentController_T* @CurrentController_M_> + 8 [ID=5] # D:0, undef:i32 [ID=1] # D:0, ./XXX/CurrentController.c:68:7
t27: i32 = TargetGlobalAddress<%struct.tag_RTM_CurrentController_T* @CurrentController_M_> + 8 [ID=5] # D:0
t6: i32 = undef [ID=1] # D:0
t10: f32 = ConstantFP<0.000000e+00> [ID=2]
In function: CurrentController_step
/* 99*/ OPC_RecordNode, // #0 = 'PDFBGT' chained node
/* 100*/ OPC_RecordChild1, // #1 = $op1
/* 101*/ OPC_Scope, 47, /*->150*/ // 8 children in Scope
/* 103*/ OPC_MoveChild1,
/* 104*/ OPC_CheckOpcode, TARGET_VAL(ISD::ConstantFP),
/* 107*/ OPC_MoveParent,
/* 108*/ OPC_RecordChild2, // #2 = $op2
/* 109*/ OPC_Scope, 20, /*->131*/ // 2 children in Scope
/* 111*/ OPC_MoveChild2,
/* 112*/ OPC_CheckOpcode, TARGET_VAL(ISD::ConstantFP),
/* 115*/ OPC_MoveParent,
/* 116*/ OPC_RecordChild3, // #3 = $dest
/* 117*/ OPC_MoveChild3,
/* 118*/ OPC_CheckOpcode, TARGET_VAL(ISD::BasicBlock),
/* 121*/ OPC_MoveParent,
/* 122*/ OPC_EmitMergeInputChains1_0,
/* 123*/ OPC_MorphNodeTo0, TARGET_VAL(PDCPU::FBGT), 0|OPFL_Chain,
3/*#Ops*/, 1, 2, 3,
// Src: (PDFBGT (fpimm:{ *:[f32] }):$op1, (fpimm:{ *:[f32] }):$op2, (bb:{ *:[Other] }):$dest) - Complexity = 9
// Dst: (FBGT ?:{ *:[f32] }:$op1, ?:{ *:[f32] }:$op2, ?:{ *:[Other] }:$dest)
/* 131*/ /*Scope*/ 17, /*->149*/
/* 132*/ OPC_CheckChild2Type, MVT::f32,
/* 134*/ OPC_RecordChild3, // #3 = $dest
/* 135*/ OPC_MoveChild3,
/* 136*/ OPC_CheckOpcode, TARGET_VAL(ISD::BasicBlock),
/* 139*/ OPC_MoveParent,
/* 140*/ OPC_EmitMergeInputChains1_0,
/* 141*/ OPC_MorphNodeTo0, TARGET_VAL(PDCPU::FBGT), 0|OPFL_Chain,
3/*#Ops*/, 1, 2, 3,
// Src: (PDFBGT (fpimm:{ *:[f32] }):$op1, GPR:{ *:[f32] }:$op2, (bb:{ *:[Other] }):$dest) - Complexity = 6
// Dst: (FBGT ?:{ *:[f32] }:$op1, ?:{ *:[f32] }:$op2, ?:{ *:[Other] }:$dest)
/* 149*/ 0, /*End of Scope*/
/* 150*/ /*Scope*/ 23, /*->174*/
/* 151*/ OPC_CheckChild1Type, MVT::f32,
/* 153*/ OPC_RecordChild2, // #2 = $op2
/* 154*/ OPC_MoveChild2,
/* 155*/ OPC_CheckOpcode, TARGET_VAL(ISD::ConstantFP),
/* 158*/ OPC_MoveParent,
/* 159*/ OPC_RecordChild3, // #3 = $dest
/* 160*/ OPC_MoveChild3,
/* 161*/ OPC_CheckOpcode, TARGET_VAL(ISD::BasicBlock),
/* 164*/ OPC_MoveParent,
/* 165*/ OPC_EmitMergeInputChains1_0,
/* 166*/ OPC_MorphNodeTo0, TARGET_VAL(PDCPU::FBGT), 0|OPFL_Chain,
3/*#Ops*/, 1, 2, 3,
// Src: (PDFBGT GPR:{ *:[f32] }:$op1, (fpimm:{ *:[f32] }):$op2, (bb:{ *:[Other] }):$dest) - Complexity = 6
// Dst: (FBGT ?:{ *:[f32] }:$op1, ?:{ *:[f32] }:$op2, ?:{ *:[Other] }:$dest)
/* 174*/ /*Scope*/ 23, /*->198*/
/* 175*/ OPC_MoveChild1,
/* 176*/ OPC_CheckOpcode, TARGET_VAL(ISD::ConstantFP),
/* 179*/ OPC_MoveParent,
/* 180*/ OPC_RecordChild2, // #2 = $op2
/* 181*/ OPC_CheckChild2Type, MVT::f32,
/* 183*/ OPC_RecordChild3, // #3 = $dest
/* 184*/ OPC_MoveChild3,
/* 185*/ OPC_CheckOpcode, TARGET_VAL(ISD::BasicBlock),
/* 188*/ OPC_MoveParent,
/* 189*/ OPC_EmitMergeInputChains1_0,
/* 190*/ OPC_MorphNodeTo0, TARGET_VAL(PDCPU::FBGT), 0|OPFL_Chain,
3/*#Ops*/, 1, 2, 3,
// Src: (PDFBGT (fpimm:{ *:[f32] }):$op1, GPRS:{ *:[f32] }:$op2, (bb:{ *:[Other] }):$dest) - Complexity = 6
// Dst: (FBGT ?:{ *:[f32] }:$op1, ?:{ *:[f32] }:$op2, ?:{ *:[Other] }:$dest)
/* 198*/ /*Scope*/ 23, /*->222*/
/* 199*/ OPC_CheckChild1Type, MVT::f32,
/* 201*/ OPC_RecordChild2, // #2 = $op2
/* 202*/ OPC_MoveChild2,
/* 203*/ OPC_CheckOpcode, TARGET_VAL(ISD::ConstantFP),
/* 206*/ OPC_MoveParent,
/* 207*/ OPC_RecordChild3, // #3 = $dest
/* 208*/ OPC_MoveChild3,
/* 209*/ OPC_CheckOpcode, TARGET_VAL(ISD::BasicBlock),
/* 212*/ OPC_MoveParent,
/* 213*/ OPC_EmitMergeInputChains1_0,
/* 214*/ OPC_MorphNodeTo0, TARGET_VAL(PDCPU::FBGT), 0|OPFL_Chain,
3/*#Ops*/, 1, 2, 3,
// Src: (PDFBGT GPRS:{ *:[f32] }:$op1, (fpimm:{ *:[f32] }):$op2, (bb:{ *:[Other] }):$dest) - Complexity = 6
// Dst: (FBGT ?:{ *:[f32] }:$op1, ?:{ *:[f32] }:$op2, ?:{ *:[Other] }:$dest)
/* 222*/ /*Scope*/ 23, /*->246*/
/* 223*/ OPC_MoveChild1,
/* 224*/ OPC_CheckOpcode, TARGET_VAL(ISD::ConstantFP),
/* 227*/ OPC_MoveParent,
/* 228*/ OPC_RecordChild2, // #2 = $op2
/* 229*/ OPC_CheckChild2Type, MVT::f32,
/* 231*/ OPC_RecordChild3, // #3 = $dest
/* 232*/ OPC_MoveChild3,
/* 233*/ OPC_CheckOpcode, TARGET_VAL(ISD::BasicBlock),
/* 236*/ OPC_MoveParent,
/* 237*/ OPC_EmitMergeInputChains1_0,
/* 238*/ OPC_MorphNodeTo0, TARGET_VAL(PDCPU::FBGT), 0|OPFL_Chain,
3/*#Ops*/, 1, 2, 3,
// Src: (PDFBGT (fpimm:{ *:[f32] }):$op1, GPRI:{ *:[f32] }:$op2, (bb:{ *:[Other] }):$dest) - Complexity = 6
// Dst: (FBGT ?:{ *:[f32] }:$op1, ?:{ *:[f32] }:$op2, ?:{ *:[Other] }:$dest)
/* 246*/ /*Scope*/ 23, /*->270*/
/* 247*/ OPC_CheckChild1Type, MVT::f32,
/* 249*/ OPC_RecordChild2, // #2 = $op2
/* 250*/ OPC_MoveChild2,
/* 251*/ OPC_CheckOpcode, TARGET_VAL(ISD::ConstantFP),
/* 254*/ OPC_MoveParent,
/* 255*/ OPC_RecordChild3, // #3 = $dest
/* 256*/ OPC_MoveChild3,
/* 257*/ OPC_CheckOpcode, TARGET_VAL(ISD::BasicBlock),
/* 260*/ OPC_MoveParent,
/* 261*/ OPC_EmitMergeInputChains1_0,
/* 262*/ OPC_MorphNodeTo0, TARGET_VAL(PDCPU::FBGT), 0|OPFL_Chain,
3/*#Ops*/, 1, 2, 3,
// Src: (PDFBGT GPRI:{ *:[f32] }:$op1, (fpimm:{ *:[f32] }):$op2, (bb:{ *:[Other] }):$dest) - Complexity = 6
// Dst: (FBGT ?:{ *:[f32] }:$op1, ?:{ *:[f32] }:$op2, ?:{ *:[Other] }:$dest)
/* 270*/ /*Scope*/ 23, /*->294*/
/* 271*/ OPC_MoveChild1,
/* 272*/ OPC_CheckOpcode, TARGET_VAL(ISD::ConstantFP),
/* 275*/ OPC_MoveParent,
/* 276*/ OPC_RecordChild2, // #2 = $op2
/* 277*/ OPC_CheckChild2Type, MVT::f32,
/* 279*/ OPC_RecordChild3, // #3 = $dest
/* 280*/ OPC_MoveChild3,
/* 281*/ OPC_CheckOpcode, TARGET_VAL(ISD::BasicBlock),
/* 284*/ OPC_MoveParent,
/* 285*/ OPC_EmitMergeInputChains1_0,
/* 286*/ OPC_MorphNodeTo0, TARGET_VAL(PDCPU::FBGT), 0|OPFL_Chain,
3/*#Ops*/, 1, 2, 3,
// Src: (PDFBGT (fpimm:{ *:[f32] }):$op1, GPRC:{ *:[f32] }:$op2, (bb:{ *:[Other] }):$dest) - Complexity = 6
// Dst: (FBGT ?:{ *:[f32] }:$op1, ?:{ *:[f32] }:$op2, ?:{ *:[Other] }:$dest)
/* 294*/ /*Scope*/ 44, /*->339*/
/* 295*/ OPC_CheckChild1Type, MVT::f32,
/* 297*/ OPC_RecordChild2, // #2 = $op2
/* 298*/ OPC_Scope, 20, /*->320*/ // 2 children in Scope
/* 300*/ OPC_MoveChild2,
/* 301*/ OPC_CheckOpcode, TARGET_VAL(ISD::ConstantFP),
/* 304*/ OPC_MoveParent,
/* 305*/ OPC_RecordChild3, // #3 = $dest
/* 306*/ OPC_MoveChild3,
/* 307*/ OPC_CheckOpcode, TARGET_VAL(ISD::BasicBlock),
/* 310*/ OPC_MoveParent,
/* 311*/ OPC_EmitMergeInputChains1_0,
/* 312*/ OPC_MorphNodeTo0, TARGET_VAL(PDCPU::FBGT), 0|OPFL_Chain,
3/*#Ops*/, 1, 2, 3,
// Src: (PDFBGT GPRC:{ *:[f32] }:$op1, (fpimm:{ *:[f32] }):$op2, (bb:{ *:[Other] }):$dest) - Complexity = 6
// Dst: (FBGT ?:{ *:[f32] }:$op1, ?:{ *:[f32] }:$op2, ?:{ *:[Other] }:$dest)
/* 320*/ /*Scope*/ 17, /*->338*/
/* 321*/ OPC_CheckChild2Type, MVT::f32,
/* 323*/ OPC_RecordChild3, // #3 = $dest
/* 324*/ OPC_MoveChild3,
/* 325*/ OPC_CheckOpcode, TARGET_VAL(ISD::BasicBlock),
/* 328*/ OPC_MoveParent,
/* 329*/ OPC_EmitMergeInputChains1_0,
/* 330*/ OPC_MorphNodeTo0, TARGET_VAL(PDCPU::FBGT), 0|OPFL_Chain,
3/*#Ops*/, 1, 2, 3,
// Src: (PDFBGT GPR:{ *:[f32] }:$op1, GPR:{ *:[f32] }:$op2, (bb:{ *:[Other] }):$dest) - Complexity = 3
// Dst: (FBGT ?:{ *:[f32] }:$op1, ?:{ *:[f32] }:$op2, ?:{ *:[Other] }:$dest)
/* 338*/ 0, /*End of Scope*/
/* 339*/ 0, /*End of Scope*/
Met vriendelijke groet / Kind regards,
Simon de Vegt
Designer
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