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Merge #828

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828: No need to emit add of constant zero. r=losfair a=nlewycky

# Description
While debugging singlepass generated code, I noticed unnecessary adds of zero. Removing them made the resulting assembly shorter and easier to analyze.


Co-authored-by: Nick Lewycky <nick@wasmer.io>
Co-authored-by: nlewycky <nick@wasmer.io>
Co-authored-by: Heyang Zhou <zhy20000919@hotmail.com>
This commit is contained in:
bors[bot] 2019-09-29 04:53:33 +00:00 committed by GitHub
commit 8a2052bb90
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 8 additions and 5 deletions
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13
lib/singlepass-backend/src/codegen_x64.rs
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@ -1514,6 +1514,7 @@ impl X64FunctionCode {
// 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(0) => {}
Some(x) => {
a.emit_add(Size::S64, Location::Imm32(x), Location::GPR(tmp_addr));
}
@ -1541,11 +1542,13 @@ 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);