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stage2: sparc64: Implement inline memcpy for genSetStack

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Koakuma 2022-05-14 22:43:46 +07:00
parent 7822426ff2
commit 26116211ec
1 changed files with 41 additions and 1 deletions
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42
src/arch/sparc64/CodeGen.zig
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@ -2375,7 +2375,47 @@ fn genSetStack(self: *Self, ty: Type, stack_offset: u32, mcv: MCValue) InnerErro
return self.fail("TODO larger stack offsets", .{});
return self.genStore(reg, .sp, i13, simm13, abi_size);
},
.memory, .stack_offset => return self.fail("TODO implement memcpy", .{}),
.memory, .stack_offset => {
switch (mcv) {
.stack_offset => |off| {
if (stack_offset == off)
return; // Copy stack variable to itself; nothing to do.
},
else => {},
}
if (abi_size <= 8) {
const reg = try self.copyToTmpRegister(ty, mcv);
return self.genSetStack(ty, stack_offset, MCValue{ .register = reg });
} else {
var ptr_ty_payload: Type.Payload.ElemType = .{
.base = .{ .tag = .single_mut_pointer },
.data = ty,
};
const ptr_ty = Type.initPayload(&ptr_ty_payload.base);
const regs = try self.register_manager.allocRegs(4, .{ null, null, null, null });
const regs_locks = self.register_manager.lockRegsAssumeUnused(4, regs);
defer for (regs_locks) |reg| {
self.register_manager.unlockReg(reg);
};
const src_reg = regs[0];
const dst_reg = regs[1];
const len_reg = regs[2];
const tmp_reg = regs[3];
switch (mcv) {
.stack_offset => |off| try self.genSetReg(ptr_ty, src_reg, .{ .ptr_stack_offset = off }),
.memory => |addr| try self.genSetReg(Type.usize, src_reg, .{ .immediate = addr }),
else => unreachable,
}
try self.genSetReg(ptr_ty, dst_reg, .{ .ptr_stack_offset = stack_offset });
try self.genSetReg(Type.usize, len_reg, .{ .immediate = abi_size });
try self.genInlineMemcpy(src_reg, dst_reg, len_reg, tmp_reg);
}
},
}
}