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Add some optimization comments

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Brendan Hansknecht 2020-11-22 18:13:52 -08:00
parent 215ec63abb
commit c8dbcdcf64
1 changed files with 4 additions and 0 deletions
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4
compiler/gen_dev/src/x86_64/asm.rs
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@ -53,6 +53,7 @@ fn add_reg_extension(reg: GPReg, byte: u8) -> u8 {
/// `ADD r/m64, imm32` -> Add imm32 sign-extended to 64-bits from r/m64.
pub fn add_register64bit_immediate32bit<'a>(buf: &mut Vec<'a, u8>, dst: GPReg, imm: i32) {
// This can be optimized if the immediate is 1 byte.
let rex = add_rm_extension(dst, REX_W);
let dst_mod = dst as u8 % 8;
buf.reserve(7);
@ -111,6 +112,7 @@ pub fn mov_register64bit_register64bit<'a>(buf: &mut Vec<'a, u8>, dst: GPReg, sr
/// `MOV r64,r/m64` -> Move r/m64 to r64.
pub fn mov_register64bit_stackoffset32bit<'a>(buf: &mut Vec<'a, u8>, dst: GPReg, offset: i32) {
// This can be optimized based on how many bytes the offset actually is.
// This function can probably be made to take any memory offset, I didn't feel like figuring it out rn.
// Also, this may technically be faster genration since stack operations should be so common.
let rex = add_reg_extension(dst, REX_W);
@ -122,6 +124,7 @@ pub fn mov_register64bit_stackoffset32bit<'a>(buf: &mut Vec<'a, u8>, dst: GPReg,
/// `MOV r/m64,r64` -> Move r64 to r/m64.
pub fn mov_stackoffset32bit_register64bit<'a>(buf: &mut Vec<'a, u8>, offset: i32, src: GPReg) {
// This can be optimized based on how many bytes the offset actually is.
// This function can probably be made to take any memory offset, I didn't feel like figuring it out rn.
// Also, this may technically be faster genration since stack operations should be so common.
let rex = add_reg_extension(src, REX_W);
@ -145,6 +148,7 @@ pub fn ret_near<'a>(buf: &mut Vec<'a, u8>) {
/// `SUB r/m64, imm32` -> Subtract imm32 sign-extended to 64-bits from r/m64.
pub fn sub_register64bit_immediate32bit<'a>(buf: &mut Vec<'a, u8>, dst: GPReg, imm: i32) {
// This can be optimized if the immediate is 1 byte.
let rex = add_rm_extension(dst, REX_W);
let dst_mod = dst as u8 % 8;
buf.reserve(7);