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Fix register zeroing in emit_compare_and_swap.

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losfair
2020-02-04 01:58:21 +08:00
parent 455783aa21
commit 60c7d1e0fc
1 changed files with 4 additions and 0 deletions
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4
lib/singlepass-backend/src/codegen_x64.rs
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@ -2105,6 +2105,10 @@ impl X64FunctionCode {
true, true,
value_size, value_size,
|a, m, addr| { |a, m, addr| {
// Memory moves with size < 32b do not zero upper bits.
if memory_sz != Size::S32 && memory_sz != Size::S64 {
a.emit_xor(Size::S32, Location::GPR(compare), Location::GPR(compare));
}
a.emit_mov(memory_sz, Location::Memory(addr, 0), Location::GPR(compare)); a.emit_mov(memory_sz, Location::Memory(addr, 0), Location::GPR(compare));
a.emit_mov(stack_sz, Location::GPR(compare), ret); a.emit_mov(stack_sz, Location::GPR(compare), ret);
cb(a, m, compare, value); cb(a, m, compare, value);