7f4c297e94
`Predicates` and `Features` fields serve the same purpose. They should be kept in sync, but not all predicates are based on features. This resulted in introducing dummy features for that only reason. This patch removes `Features` field and changes TableGen emitters to use `Predicates` instead. Historically, predicates were written with the assumption that the checking code will be used in `SelectionDAGISel` subclasses, meaning they will have access to the subclass variables, such as `Subtarget`. There are no such variables in the generated `GenSubtargetInfo::getHwModeSet()`, so we need to provide them. This can be achieved by subclassing `HwModePredicateProlog`, see an example in `Hexagon.td`.
119 lines
3.4 KiB
TableGen
119 lines
3.4 KiB
TableGen
// RUN: llvm-tblgen -gen-disassembler -I %p/../../include %s | \
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// RUN: FileCheck %s --check-prefix=DECODER
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// RUN: llvm-tblgen -gen-disassembler --suppress-per-hwmode-duplicates=O2 -I \
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// RUN: %p/../../include %s | FileCheck %s --check-prefix=DECODER-SUPPRESS
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// Test duplicate table suppression for per-HwMode decoders.
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include "llvm/Target/Target.td"
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def archInstrInfo : InstrInfo { }
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def arch : Target {
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let InstructionSet = archInstrInfo;
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}
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def Myi32 : Operand<i32> {
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let DecoderMethod = "DecodeMyi32";
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}
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def HasA : Predicate<"Subtarget->hasA()">;
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def HasB : Predicate<"Subtarget->hasB()">;
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def ModeA : HwMode<[HasA]>;
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def ModeB : HwMode<[HasB]>;
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def fooTypeEncA : InstructionEncoding {
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let Size = 4;
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field bits<32> SoftFail = 0;
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bits<32> Inst;
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bits<8> factor;
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let Inst{7...0} = factor;
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let Inst{3...2} = 0b11;
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let Inst{1...0} = 0b00;
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}
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def fooTypeEncB : InstructionEncoding {
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let Size = 4;
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field bits<32> SoftFail = 0;
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bits<32> Inst;
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bits<8> factor;
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let Inst{15...8} = factor;
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let Inst{1...0} = 0b11;
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}
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let OutOperandList = (outs) in {
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def foo : Instruction {
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let InOperandList = (ins i32imm:$factor);
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let EncodingInfos = EncodingByHwMode<
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[ModeA, ModeB], [fooTypeEncA, fooTypeEncB]
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>;
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let AsmString = "foo $factor";
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}
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// Encoding not overridden, same namespace:
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// In the default case, this instruction is duplicated into both ModeA and
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// ModeB decoder tables.
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// In the suppressed case, this instruction appears in a single decoder table.
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def bar: Instruction {
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let InOperandList = (ins i32imm:$factor);
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let Size = 4;
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bits<32> Inst;
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bits<32> SoftFail;
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bits<8> factor;
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let Inst{31...24} = factor;
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let Inst{1...0} = 0b10;
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let AsmString = "bar $factor";
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}
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def baz : Instruction {
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let InOperandList = (ins i32imm:$factor);
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bits<32> Inst;
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let EncodingInfos = EncodingByHwMode<
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[ModeB], [fooTypeEncA]
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>;
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let AsmString = "foo $factor";
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}
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// Encoding not overridden, different namespace:
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// In the default case, this instruction is duplicated into two Alt decoder
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// tables (ModeA and ModeB).
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// In the suppressed case, this instruction appears in a single decoder table.
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def unrelated: Instruction {
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let DecoderNamespace = "Alt";
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let InOperandList = (ins i32imm:$factor);
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let Size = 4;
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bits<32> Inst;
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bits<32> SoftFail;
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bits<8> factor;
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let Inst{31...24} = factor;
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let Inst{1...0} = 0b10;
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let AsmString = "unrelated $factor";
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}
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}
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// DECODER-LABEL: DecoderTable_ModeA32
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// DECODER-DAG: Opcode: fooTypeEncA:foo
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// DECODER-DAG: Opcode: bar
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// DECODER-LABEL: DecoderTable_ModeB32
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// DECODER-DAG: Opcode: fooTypeEncB:foo
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// DECODER-DAG: Opcode: fooTypeEncA:baz
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// DECODER-DAG: Opcode: bar
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// DECODER-LABEL: DecoderTableAlt_ModeA32
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// DECODER-DAG: Opcode: unrelated
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// DECODER-LABEL: DecoderTableAlt_ModeB32
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// DECODER-DAG: Opcode: unrelated
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// DECODER-SUPPRESS-LABEL: DecoderTable32
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// DECODER-SUPPRESS-DAG: Opcode: bar
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// DECODER-SUPPRESS-LABEL: DecoderTable_ModeA32
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// DECODER-SUPPRESS-DAG: Opcode: fooTypeEncA:foo
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// DECODER-SUPPRESS-NOT: Opcode: bar
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// DECODER-SUPPRESS-LABEL: DecoderTable_ModeB32
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// DECODER-SUPPRESS-DAG: Opcode: fooTypeEncB:foo
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// DECODER-SUPPRESS-DAG: Opcode: fooTypeEncA:baz
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// DECODER-SUPPRESS-NOT: Opcode: bar
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// DECODER-SUPPRESS-LABEL: DecoderTableAlt32
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// DECODER-SUPPRESS-DAG: Opcode: unrelated
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