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stage2: detect unreferenced non-volatile asm and NOT

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This commit is contained in:
Andrew Kelley 2020-07-13 23:48:26 -07:00
parent 4f5e065d6e
commit 5da5ded743
1 changed files with 5 additions and 0 deletions
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5
src-self-hosted/codegen.zig
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@ -412,6 +412,9 @@ const Function = struct {
}
fn genNot(self: *Function, inst: *ir.Inst.Not, comptime arch: std.Target.Cpu.Arch) !MCValue {
// No side effects, so if it's unreferenced, do nothing.
if (inst.base.isUnused())
return MCValue.dead;
switch (arch) {
else => return self.fail(inst.base.src, "TODO implement NOT for {}", .{self.target.cpu.arch}),
}
@ -819,6 +822,8 @@ const Function = struct {
}
fn genAsm(self: *Function, inst: *ir.Inst.Assembly, comptime arch: Target.Cpu.Arch) !MCValue {
if (!inst.args.is_volatile and inst.base.isUnused())
return MCValue.dead;
if (arch != .x86_64 and arch != .i386) {
return self.fail(inst.base.src, "TODO implement inline asm support for more architectures", .{});
}