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stage2 ARM: Implement loading from memory

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joachimschmidt557 2021-08-18 15:09:21 +02:00 committed by Andrew Kelley
parent a2438357e1
commit e48d7bbb99
1 changed files with 27 additions and 23 deletions
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50
src/codegen.zig
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@ -1469,7 +1469,7 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
return true;
}
fn load(self: *Self, dst_mcv: MCValue, ptr: MCValue, ptr_ty: Type) !void {
fn load(self: *Self, dst_mcv: MCValue, ptr: MCValue, ptr_ty: Type) InnerError!void {
const elem_ty = ptr_ty.elemType();
switch (ptr) {
.none => unreachable,
@ -1486,11 +1486,25 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
.embedded_in_code => {
return self.fail("TODO implement loading from MCValue.embedded_in_code", .{});
},
.register => {
return self.fail("TODO implement loading from MCValue.register", .{});
.register => |reg| {
switch (arch) {
.arm, .armeb => switch (dst_mcv) {
.dead => unreachable,
.undef => unreachable,
.compare_flags_signed, .compare_flags_unsigned => unreachable,
.embedded_in_code => unreachable,
.register => |dst_reg| {
writeInt(u32, try self.code.addManyAsArray(4), Instruction.ldr(.al, dst_reg, reg, .{ .offset = Instruction.Offset.none }).toU32());
},
else => return self.fail("TODO load from register into {}", .{dst_mcv}),
},
else => return self.fail("TODO implement loading from MCValue.register for {}", .{arch}),
}
},
.memory => {
return self.fail("TODO implement loading from MCValue.memory", .{});
.memory => |addr| {
const reg = try self.register_manager.allocReg(null, &.{});
try self.genSetReg(ptr_ty, reg, .{ .memory = addr });
try self.load(dst_mcv, .{ .register = reg }, ptr_ty);
},
.stack_offset => {
return self.fail("TODO implement loading from MCValue.stack_offset", .{});
@ -3884,15 +3898,10 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
else => return self.fail("TODO implement memset", .{}),
}
},
.compare_flags_unsigned => |op| {
_ = op;
return self.fail("TODO implement set stack variable with compare flags value (unsigned)", .{});
},
.compare_flags_signed => |op| {
_ = op;
return self.fail("TODO implement set stack variable with compare flags value (signed)", .{});
},
.immediate => {
.compare_flags_unsigned,
.compare_flags_signed,
.immediate,
=> {
const reg = try self.copyToTmpRegister(ty, mcv);
return self.genSetStack(ty, stack_offset, MCValue{ .register = reg });
},
@ -4060,15 +4069,10 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
else => return self.fail("TODO implement memset", .{}),
}
},
.compare_flags_unsigned => |op| {
_ = op;
return self.fail("TODO implement set stack variable with compare flags value (unsigned)", .{});
},
.compare_flags_signed => |op| {
_ = op;
return self.fail("TODO implement set stack variable with compare flags value (signed)", .{});
},
.immediate => {
.compare_flags_unsigned,
.compare_flags_signed,
.immediate,
=> {
const reg = try self.copyToTmpRegister(ty, mcv);
return self.genSetStack(ty, stack_offset, MCValue{ .register = reg });
},