BitOffsetDecoder.td
1.68 KB
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// RUN: llvm-tblgen -gen-disassembler -I %p/../../include %s | FileCheck %s
include "llvm/Target/Target.td"
def archInstrInfo : InstrInfo { }
def arch : Target {
let InstructionSet = archInstrInfo;
}
def Myi32 : Operand<i32> {
let DecoderMethod = "DecodeMyi32";
}
let OutOperandList = (outs), Size = 2 in {
def foo : Instruction {
let InOperandList = (ins i32imm:$factor);
field bits<16> Inst;
bits<32> factor;
let Inst{7...0} = 0xAA;
let Inst{14...8} = factor{6...0}; // no offset
let AsmString = "foo $factor";
field bits<16> SoftFail = 0;
}
def bar : Instruction {
let InOperandList = (ins i32imm:$factor);
field bits<16> Inst;
bits<32> factor;
let Inst{7...0} = 0xBB;
let Inst{15...8} = factor{10...3}; // offset by 3
let AsmString = "bar $factor";
field bits<16> SoftFail = 0;
}
def biz : Instruction {
let InOperandList = (ins i32imm:$factor);
field bits<16> Inst;
bits<32> factor;
let Inst{7...0} = 0xCC;
let Inst{11...8,15...12} = factor{10...3}; // offset by 3, multipart
let AsmString = "biz $factor";
field bits<16> SoftFail = 0;
}
def baz : Instruction {
let InOperandList = (ins Myi32:$factor);
field bits<16> Inst;
bits<32> factor;
let Inst{7...0} = 0xDD;
let Inst{15...8} = factor{11...4}; // offset by 4 + custom decode
let AsmString = "baz $factor";
field bits<16> SoftFail = 0;
}
}
// CHECK: tmp = fieldFromInstruction(insn, 8, 7);
// CHECK: tmp = fieldFromInstruction(insn, 8, 8) << 3;
// CHECK: tmp |= fieldFromInstruction(insn, 8, 4) << 7;
// CHECK: tmp |= fieldFromInstruction(insn, 12, 4) << 3;
// CHECK: tmp = fieldFromInstruction(insn, 8, 8) << 4;