ffc9a30938
1. Bitwise operations are used to access HwMode, allowing for the coexistence of HwMode IDs for different features (such as RegInfo and EncodingInfo). This will provide better scalability for HwMode. Currently, most users utilize HwMode primarily for configuring Register-related information, and few use it for configuring Encoding. The limited scalability of HwMode has been a significant factor in this usage pattern. 2. Sink the HwMode Encodings selection logic down to per instruction level, this makes the logic for choosing encodings clearer and provides better error messages. 3. Add some HwMode ID conflict detection to the getHwMode() interface.
268 lines
9.6 KiB
TableGen
268 lines
9.6 KiB
TableGen
// RUN: llvm-tblgen -gen-emitter -I %p/../../include %s | \
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// RUN: FileCheck %s --check-prefix=ENCODER
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// 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=O1 -I \
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// RUN: %p/../../include %s | FileCheck %s --check-prefix=DECODER-SUPPRESS-O1
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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-O2
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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<"+a", [HasA]>; // Mode 1
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def ModeB : HwMode<"+b", [HasB]>; // Mode 2
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def ModeC : HwMode<"+c", []>; // Mode 3
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def fooTypeEncDefault : InstructionEncoding {
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let Size = 8;
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field bits<64> SoftFail = 0;
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bits<64> 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} = 0b10;
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let Inst{1...0} = 0b00;
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}
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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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def fooTypeEncC : 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{31...24} = factor;
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let Inst{23...21} = 0b110;
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let Inst{1...0} = 0b11;
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}
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// Test for DefaultMode as a selector.
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def foo : Instruction {
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let OutOperandList = (outs);
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let InOperandList = (ins i32imm:$factor);
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let EncodingInfos = EncodingByHwMode<
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[ModeC, ModeA, ModeB, DefaultMode],
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[fooTypeEncC, fooTypeEncA, fooTypeEncB, fooTypeEncDefault]>;
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let AsmString = "foo $factor";
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}
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def bar: Instruction {
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let OutOperandList = (outs);
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let InOperandList = (ins i32imm:$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 $factor";
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}
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def baz : Instruction {
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let OutOperandList = (outs);
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let InOperandList = (ins i32imm:$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 $factor";
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}
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def unrelated: Instruction {
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let OutOperandList = (outs);
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let DecoderNamespace = "Alt";
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let InOperandList = (ins i32imm:$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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// Under default settings, using 'HwMode' to dictate instruction encodings results in
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// significant duplication of DecoderTables. The four tables ‘DecoderTableAlt32’,
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// ‘DecoderTableAlt_ModeA32’, ‘DecoderTableAlt_ModeB32’ and 'DecoderTable_ModeC32' are
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// exact duplicates and could effectively be merged into one.
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// DECODER-LABEL: DecoderTable32[] =
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// DECODER-DAG: Opcode: bar
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// DECODER-LABEL: DecoderTable64[] =
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// DECODER-DAG: Opcode: fooTypeEncDefault:foo
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// DECODER-LABEL: DecoderTableAlt32[] =
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// DECODER-DAG: Opcode: unrelated
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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-LABEL: DecoderTableAlt_ModeC32[] =
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// DECODER-DAG: Opcode: unrelated
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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: DecoderTable_ModeC32[] =
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// DECODER-DAG: Opcode: fooTypeEncC:foo
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// DECODER-DAG: Opcode: bar
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// Under the 'O1' optimization level, unnecessary duplicate tables will be eliminated,
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// reducing the four ‘Alt’ tables down to just one.
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// DECODER-SUPPRESS-O1-LABEL: DecoderTable32[] =
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// DECODER-SUPPRESS-O1-DAG: Opcode: bar
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// DECODER-SUPPRESS-O1-LABEL: DecoderTable64[] =
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// DECODER-SUPPRESS-O1-DAG: Opcode: fooTypeEncDefault:foo
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// DECODER-SUPPRESS-O1-LABEL: DecoderTableAlt32[] =
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// DECODER-SUPPRESS-O1-DAG: Opcode: unrelated
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// DECODER-SUPPRESS-O1-LABEL: DecoderTable_ModeA32[] =
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// DECODER-SUPPRESS-O1-DAG: Opcode: fooTypeEncA:foo
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// DECODER-SUPPRESS-O1-DAG: Opcode: bar
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// DECODER-SUPPRESS-O1-LABEL: DecoderTable_ModeB32[] =
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// DECODER-SUPPRESS-O1-DAG: Opcode: fooTypeEncB:foo
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// DECODER-SUPPRESS-O1-DAG: Opcode: fooTypeEncA:baz
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// DECODER-SUPPRESS-O1-DAG: Opcode: bar
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// DECODER-SUPPRESS-O1-LABEL: DecoderTable_ModeC32[] =
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// DECODER-SUPPRESS-O1-DAG: Opcode: fooTypeEncC:foo
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// DECODER-SUPPRESS-O1-DAG: Opcode: bar
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// Under the 'O2' optimization condition, instructions possessing the 'EncodingByHwMode'
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// attribute will be extracted from their original DecoderNamespace and placed into their
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// respective HwMode tables. Meanwhile, other instructions that do not have the 'EncodingByHwMode'
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// attribute but are within the same DecoderNamespace will be stored in the 'Default' table. This
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// approach will significantly reduce instruction redundancy, but it necessitates users to thoroughly
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// consider the interplay between HwMode and DecoderNamespace for their instructions.
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// DECODER-SUPPRESS-O2-LABEL: DecoderTable32[] =
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// DECODER-SUPPRESS-O2-DAG: Opcode: bar
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// DECODER-SUPPRESS-O2-LABEL: DecoderTable64[] =
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// DECODER-SUPPRESS-O2-NOT: Opcode: bar
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// DECODER-SUPPRESS-O2-DAG: Opcode: fooTypeEncDefault:foo
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// DECODER-SUPPRESS-O2-LABEL: DecoderTableAlt32[] =
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// DECODER-SUPPRESS-O2-DAG: Opcode: unrelated
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// DECODER-SUPPRESS-O2-LABEL: DecoderTable_ModeA32[] =
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// DECODER-SUPPRESS-O2-DAG: Opcode: fooTypeEncA:foo
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// DECODER-SUPPRESS-O2-NOT: Opcode: bar
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// DECODER-SUPPRESS-O2-LABEL: DecoderTable_ModeB32[] =
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// DECODER-SUPPRESS-O2-DAG: Opcode: fooTypeEncB:foo
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// DECODER-SUPPRESS-O2-DAG: Opcode: fooTypeEncA:baz
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// DECODER-SUPPRESS-O2-NOT: Opcode: bar
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// DECODER-SUPPRESS-O2-LABEL: DecoderTable_ModeC32[] =
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// DECODER-SUPPRESS-O2-DAG: Opcode: fooTypeEncC:foo
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// DECODER-SUPPRESS-O2-NOT: Opcode: bar
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// For 'bar' and 'unrelated', we didn't assign any HwModes for them,
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// they should keep the same in the following four tables.
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// For 'foo' we assigned four HwModes( includes 'DefaultMode' ),
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// it's encodings should be different in the following four tables.
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// For 'baz' we only assigned ModeB for it, so it will be presented
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// as '0' in the tables of ModeA, ModeC and Default Mode.
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// ENCODER-LABEL: static const uint64_t InstBits[] = {
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// ENCODER: UINT64_C(2), // bar
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// ENCODER: UINT64_C(0), // baz
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// ENCODER: UINT64_C(8), // foo
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// ENCODER: UINT64_C(2), // unrelated
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// ENCODER-LABEL: static const uint64_t InstBits_ModeA[] = {
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// ENCODER: UINT64_C(2), // bar
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// ENCODER: UINT64_C(0), // baz
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// ENCODER: UINT64_C(12), // foo
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// ENCODER: UINT64_C(2), // unrelated
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// ENCODER-LABEL: static const uint64_t InstBits_ModeB[] = {
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// ENCODER: UINT64_C(2), // bar
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// ENCODER: UINT64_C(12), // baz
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// ENCODER: UINT64_C(3), // foo
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// ENCODER: UINT64_C(2), // unrelated
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// ENCODER-LABEL: static const uint64_t InstBits_ModeC[] = {
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// ENCODER: UINT64_C(2), // bar
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// ENCODER: UINT64_C(0), // baz
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// ENCODER: UINT64_C(12582915), // foo
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// ENCODER: UINT64_C(2), // unrelated
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// ENCODER-LABEL: case ::bar:
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// ENCODER-LABEL: case ::unrelated:
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// ENCODER-NOT: getHwMode
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// ENCODER-LABEL: case ::foo: {
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// ENCODER: unsigned HwMode = STI.getHwMode(MCSubtargetInfo::HwMode_EncodingInfo);
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// ENCODER: switch (HwMode) {
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// ENCODER: default: llvm_unreachable("Unknown hardware mode!"); break;
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// ENCODER: case 0: InstBitsByHw = InstBits; break;
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// ENCODER: case 1: InstBitsByHw = InstBits_ModeA; break;
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// ENCODER: case 2: InstBitsByHw = InstBits_ModeB; break;
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// ENCODER: case 3: InstBitsByHw = InstBits_ModeC; break;
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// ENCODER: };
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// ENCODER: Value = InstBitsByHw[opcode];
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// ENCODER: switch (HwMode) {
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// ENCODER: default: llvm_unreachable("Unhandled HwMode");
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// ENCODER: case 0: {
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// ENCODER: op = getMachineOpValue(MI, MI.getOperand(0), Fixups, STI);
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// ENCODER: op &= UINT64_C(240);
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// ENCODER: Value |= op;
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// ENCODER: break;
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// ENCODER: }
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// ENCODER: case 1: {
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// ENCODER: op = getMachineOpValue(MI, MI.getOperand(0), Fixups, STI);
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// ENCODER: op &= UINT64_C(240);
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// ENCODER: Value |= op;
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// ENCODER: break;
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// ENCODER: }
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// ENCODER: case 2: {
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// ENCODER: op = getMachineOpValue(MI, MI.getOperand(0), Fixups, STI);
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// ENCODER: op &= UINT64_C(255);
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// ENCODER: op <<= 8;
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// ENCODER: Value |= op;
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// ENCODER: break;
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// ENCODER: }
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// ENCODER: case 3: {
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// ENCODER: op = getMachineOpValue(MI, MI.getOperand(0), Fixups, STI);
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// ENCODER: op &= UINT64_C(255);
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// ENCODER: op <<= 24;
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// ENCODER: Value |= op;
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// ENCODER: break;
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// ENCODER: }
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// ENCODER-LABEL: case ::baz: {
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// ENCODER: unsigned HwMode = STI.getHwMode(MCSubtargetInfo::HwMode_EncodingInfo);
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// ENCODER: switch (HwMode) {
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// ENCODER: default: llvm_unreachable("Unknown hardware mode!"); break;
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// ENCODER: case 2: InstBitsByHw = InstBits_ModeB; break;
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// ENCODER: };
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// ENCODER: Value = InstBitsByHw[opcode];
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// ENCODER: switch (HwMode) {
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// ENCODER: default: llvm_unreachable("Unhandled HwMode");
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// ENCODER: case 2: {
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// ENCODER: op = getMachineOpValue(MI, MI.getOperand(0), Fixups, STI);
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// ENCODER: op &= UINT64_C(240);
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// ENCODER: Value |= op;
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// ENCODER: break;
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// ENCODER: }
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