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No need to emit add of constant zero.

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This commit is contained in:
Nick Lewycky 2019-09-23 15:01:19 -07:00
parent 8c5ccdb497
commit 07b5991080
1 changed files with 25 additions and 21 deletions
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46
lib/singlepass-backend/src/codegen_x64.rs
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@ -1512,22 +1512,24 @@ impl X64FunctionCode {
a.emit_add(Size::S64, Location::GPR(tmp_base), Location::GPR(tmp_bound));
a.emit_mov(Size::S32, addr, Location::GPR(tmp_addr));
// This branch is used for emitting "faster" code for the special case of (offset + value_size) not exceeding u32 range.
match (offset as u32).checked_add(value_size as u32) {
Some(x) => {
a.emit_add(Size::S64, Location::Imm32(x), Location::GPR(tmp_addr));
}
None => {
a.emit_add(
Size::S64,
Location::Imm32(offset as u32),
Location::GPR(tmp_addr),
);
a.emit_add(
Size::S64,
Location::Imm32(value_size as u32),
Location::GPR(tmp_addr),
);
if offset != 0 && value_size != 0 {
// This branch is used for emitting "faster" code for the special case of (offset + value_size) not exceeding u32 range.
match (offset as u32).checked_add(value_size as u32) {
Some(x) => {
a.emit_add(Size::S64, Location::Imm32(x), Location::GPR(tmp_addr));
}
None => {
a.emit_add(
Size::S64,
Location::Imm32(offset as u32),
Location::GPR(tmp_addr),
);
a.emit_add(
Size::S64,
Location::Imm32(value_size as u32),
Location::GPR(tmp_addr),
);
}
}
}
@ -1541,11 +1543,13 @@ impl X64FunctionCode {
// Calculates the real address, and loads from it.
a.emit_mov(Size::S32, addr, Location::GPR(tmp_addr));
a.emit_add(
Size::S64,
Location::Imm32(offset as u32),
Location::GPR(tmp_addr),
);
if offset != 0 {
a.emit_add(
Size::S64,
Location::Imm32(offset as u32),
Location::GPR(tmp_addr),
);
}
a.emit_add(Size::S64, Location::GPR(tmp_base), Location::GPR(tmp_addr));
m.release_temp_gpr(tmp_base);