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codegen: introduce toCanonicalReg to clean up x86-specific logic

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This commit is contained in:
Andrew Kelley
2020-08-04 15:31:54 -07:00
parent ea3cc777cc
commit 02d09d1328
1 changed files with 12 additions and 3 deletions
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15
src-self-hosted/codegen.zig
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@@ -588,9 +588,9 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
entry.value = .dead;
switch (prev_value) {
.register => |reg| {
const reg64 = if (arch == .x86_64) reg.to64() else reg;
_ = branch.registers.remove(reg64);
branch.markRegFree(reg64);
const canon_reg = toCanonicalReg(reg);
_ = branch.registers.remove(canon_reg);
branch.markRegFree(canon_reg);
},
else => {}, // TODO process stack allocation death
}
@@ -2097,5 +2097,14 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
else => return reg,
}
}
/// For most architectures this does nothing. For x86_64 it resolves any aliased registers
/// to the 64-bit wide ones.
fn toCanonicalReg(reg: Register) Register {
return switch (arch) {
.x86_64 => reg.to64(),
else => reg,
};
}
};
}