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x86_64: fix store of undefined

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This commit is contained in:
Jacob Young 2023-03-13 20:25:13 -04:00
parent 9a4e9215fc
commit 5ab426a302
1 changed files with 7 additions and 1 deletions
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8
src/arch/x86_64/CodeGen.zig
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@ -2861,7 +2861,13 @@ fn store(self: *Self, ptr: MCValue, value: MCValue, ptr_ty: Type, value_ty: Type
.unreach => unreachable,
.eflags => unreachable,
.undef => {
try self.genSetReg(value_ty, reg, value);
switch (abi_size) {
1 => try self.store(ptr, .{ .immediate = 0xaa }, ptr_ty, value_ty),
2 => try self.store(ptr, .{ .immediate = 0xaaaa }, ptr_ty, value_ty),
4 => try self.store(ptr, .{ .immediate = 0xaaaaaaaa }, ptr_ty, value_ty),
8 => try self.store(ptr, .{ .immediate = 0xaaaaaaaaaaaaaaaa }, ptr_ty, value_ty),
else => try self.genInlineMemset(ptr, .{ .immediate = 0xaa }, .{ .immediate = abi_size }, .{}),
}
},
.immediate => |imm| {
switch (abi_size) {