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singlepass: Align loop headers to 16 bytes.

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This commit is contained in:
losfair
2020-06-02 01:58:05 +08:00
parent fcfa378ace
commit fe2b979f0e
2 changed files with 49 additions and 0 deletions
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9
lib/compiler-singlepass/src/codegen_x64.rs
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@@ -5586,6 +5586,15 @@ impl<'a> FuncGen<'a> {
self.control_stack.push(frame);
}
Operator::Loop { ty } => {
// Pad with NOPs to the next 16-byte boundary.
match self.assembler.get_offset().0 % 16 {
0 => {}
x => {
self.assembler.emit_nop_n(16 - x);
}
}
assert_eq!(self.assembler.get_offset().0 % 16, 0);
let label = self.assembler.get_label();
let state_diff_id = self.get_state_diff();
let _activate_offset = self.assembler.get_offset().0;