cli/q
Code Issues 1 Pull Requests Activity

Implemented bit shifts

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This commit is contained in:
Eduard Urbach
2024-07-25 15:47:19 +02:00
parent d1a8f0d66c
commit f0bc5039ee
7 changed files with 101 additions and 2 deletions
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17
src/build/arch/x64/Shift.go Normal file
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@ -0,0 +1,17 @@
package x64
import (
"git.akyoto.dev/cli/q/src/build/cpu"
)
// ShiftLeftNumber shifts the register value by `bitCount` bits to the left.
func ShiftLeftNumber(code []byte, register cpu.Register, bitCount byte) []byte {
code = encode(code, AddressDirect, 0b100, register, 8, 0xC1)
return append(code, bitCount)
}
// ShiftRightSignedNumber shifts the signed register value by `bitCount` bits to the right.
func ShiftRightSignedNumber(code []byte, register cpu.Register, bitCount byte) []byte {
code = encode(code, AddressDirect, 0b111, register, 8, 0xC1)
return append(code, bitCount)
}

12
src/build/asm/Finalize.go
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@ -184,6 +184,18 @@ func (a Assembler) Finalize() ([]byte, []byte) {
case RETURN:
code = x64.Return(code)
case SHIFTL:
switch operands := x.Data.(type) {
case *RegisterNumber:
code = x64.ShiftLeftNumber(code, operands.Register, byte(operands.Number)&0b111111)
}
case SHIFTRS:
switch operands := x.Data.(type) {
case *RegisterNumber:
code = x64.ShiftRightSignedNumber(code, operands.Register, byte(operands.Number)&0b111111)
}
case STORE:
switch operands := x.Data.(type) {
case *MemoryNumber:

6
src/build/asm/Mnemonic.go
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@ -26,6 +26,8 @@ const (
POP
PUSH
RETURN
SHIFTL
SHIFTRS
STORE
SUB
SYSCALL
@ -79,6 +81,10 @@ func (m Mnemonic) String() string {
return "push"
case RETURN:
return "return"
case SHIFTL:
return "shift l"
case SHIFTRS:
return "shift rs"
case SUB:
return "sub"
case STORE:

6
src/build/core/ExecuteRegisterNumber.go
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@ -34,6 +34,12 @@ func (f *Function) ExecuteRegisterNumber(operation token.Token, register cpu.Reg
case token.Xor, token.XorAssign:
f.RegisterNumber(asm.XOR, register, number)
case token.Shl, token.ShlAssign:
f.RegisterNumber(asm.SHIFTL, register, number)
case token.Shr, token.ShrAssign:
f.RegisterNumber(asm.SHIFTRS, register, number)
case token.Equal, token.NotEqual, token.Less, token.LessEqual, token.Greater, token.GreaterEqual:
f.RegisterNumber(asm.COMPARE, register, number)