Implemented move with sign extension
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@ -9,12 +9,17 @@ import (
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// MoveRegisterNumber moves an integer into the given register.
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func MoveRegisterNumber(code []byte, destination cpu.Register, number int) []byte {
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w := byte(0)
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b := byte(0)
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if SizeOf(int64(number)) == 8 {
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w = 1
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}
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if w == 0 && number < 0 {
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return MoveRegisterNumber32(code, destination, number)
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}
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b := byte(0)
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if destination > 0b111 {
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b = 1
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destination &= 0b111
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@ -33,6 +38,21 @@ func MoveRegisterNumber(code []byte, destination cpu.Register, number int) []byt
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}
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}
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// MoveRegisterNumber32 moves an integer into the given register and sign-extends the register.
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func MoveRegisterNumber32(code []byte, destination cpu.Register, number int) []byte {
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b := byte(0)
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if destination > 0b111 {
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b = 1
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destination &= 0b111
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}
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code = append(code, REX(1, 0, 0, b))
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code = append(code, 0xC7)
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code = append(code, ModRM(AddressDirect, 0, byte(destination)))
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return binary.LittleEndian.AppendUint32(code, uint32(number))
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}
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// MoveRegisterRegister moves a register value into another register.
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func MoveRegisterRegister(code []byte, destination cpu.Register, source cpu.Register) []byte {
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return encode(code, AddressDirect, source, destination, 8, 0x89)
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@ -14,6 +14,7 @@ func TestMoveRegisterNumber(t *testing.T) {
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Number int
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Code []byte
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}{
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// 32 bits
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{x64.RAX, 0x7FFFFFFF, []byte{0xB8, 0xFF, 0xFF, 0xFF, 0x7F}},
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{x64.RCX, 0x7FFFFFFF, []byte{0xB9, 0xFF, 0xFF, 0xFF, 0x7F}},
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{x64.RDX, 0x7FFFFFFF, []byte{0xBA, 0xFF, 0xFF, 0xFF, 0x7F}},
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@ -31,6 +32,7 @@ func TestMoveRegisterNumber(t *testing.T) {
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{x64.R14, 0x7FFFFFFF, []byte{0x41, 0xBE, 0xFF, 0xFF, 0xFF, 0x7F}},
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{x64.R15, 0x7FFFFFFF, []byte{0x41, 0xBF, 0xFF, 0xFF, 0xFF, 0x7F}},
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// 64 bits
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{x64.RAX, 0x7FFFFFFFFFFFFFFF, []byte{0x48, 0xB8, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x7F}},
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{x64.RCX, 0x7FFFFFFFFFFFFFFF, []byte{0x48, 0xB9, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x7F}},
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{x64.RDX, 0x7FFFFFFFFFFFFFFF, []byte{0x48, 0xBA, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x7F}},
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@ -47,6 +49,24 @@ func TestMoveRegisterNumber(t *testing.T) {
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{x64.R13, 0x7FFFFFFFFFFFFFFF, []byte{0x49, 0xBD, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x7F}},
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{x64.R14, 0x7FFFFFFFFFFFFFFF, []byte{0x49, 0xBE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x7F}},
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{x64.R15, 0x7FFFFFFFFFFFFFFF, []byte{0x49, 0xBF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x7F}},
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// Negative numbers
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{x64.RAX, -1, []byte{0x48, 0xC7, 0xC0, 0xFF, 0xFF, 0xFF, 0xFF}},
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{x64.RCX, -1, []byte{0x48, 0xC7, 0xC1, 0xFF, 0xFF, 0xFF, 0xFF}},
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{x64.RDX, -1, []byte{0x48, 0xC7, 0xC2, 0xFF, 0xFF, 0xFF, 0xFF}},
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{x64.RBX, -1, []byte{0x48, 0xC7, 0xC3, 0xFF, 0xFF, 0xFF, 0xFF}},
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{x64.RSP, -1, []byte{0x48, 0xC7, 0xC4, 0xFF, 0xFF, 0xFF, 0xFF}},
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{x64.RBP, -1, []byte{0x48, 0xC7, 0xC5, 0xFF, 0xFF, 0xFF, 0xFF}},
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{x64.RSI, -1, []byte{0x48, 0xC7, 0xC6, 0xFF, 0xFF, 0xFF, 0xFF}},
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{x64.RDI, -1, []byte{0x48, 0xC7, 0xC7, 0xFF, 0xFF, 0xFF, 0xFF}},
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{x64.R8, -1, []byte{0x49, 0xC7, 0xC0, 0xFF, 0xFF, 0xFF, 0xFF}},
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{x64.R9, -1, []byte{0x49, 0xC7, 0xC1, 0xFF, 0xFF, 0xFF, 0xFF}},
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{x64.R10, -1, []byte{0x49, 0xC7, 0xC2, 0xFF, 0xFF, 0xFF, 0xFF}},
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{x64.R11, -1, []byte{0x49, 0xC7, 0xC3, 0xFF, 0xFF, 0xFF, 0xFF}},
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{x64.R12, -1, []byte{0x49, 0xC7, 0xC4, 0xFF, 0xFF, 0xFF, 0xFF}},
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{x64.R13, -1, []byte{0x49, 0xC7, 0xC5, 0xFF, 0xFF, 0xFF, 0xFF}},
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{x64.R14, -1, []byte{0x49, 0xC7, 0xC6, 0xFF, 0xFF, 0xFF, 0xFF}},
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{x64.R15, -1, []byte{0x49, 0xC7, 0xC7, 0xFF, 0xFF, 0xFF, 0xFF}},
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}
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for _, pattern := range usagePatterns {
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@ -1,5 +1,5 @@
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main() {
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syscall(60, f(-32))
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assert f(-32) == 32
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}
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f(x) {
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@ -1,5 +1,5 @@
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main() {
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a := -32
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b := 64
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syscall(60, a + b)
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assert a + b == 32
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}
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@ -31,8 +31,8 @@ var programs = []struct {
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{"modulo", "", "", 0},
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{"modulo-assign", "", "", 0},
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{"division-split", "", "", 0},
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{"negative", "", "", 32},
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{"negation", "", "", 32},
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{"negative", "", "", 0},
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{"negation", "", "", 0},
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{"square-sum", "", "", 0},
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{"chained-calls", "", "", 0},
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{"nested-calls", "", "", 0},
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