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AstGen: avoid unnecessary coercion instructions

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Coercions such as `@as(usize, 0)` can be trivially elided by matching
these cases and translating to fixed InternPool indices.
This commit is contained in:
mlugg 2024-02-26 15:11:38 +00:00
parent 147beec7da
commit f0a4bb6bd1
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1 changed files with 20 additions and 2 deletions
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22
lib/std/zig/AstGen.zig
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@ -10874,6 +10874,7 @@ fn rvalueInner(
const as_comptime_int = @as(u64, @intFromEnum(Zir.Inst.Ref.comptime_int_type)) << 32;
const as_bool = @as(u64, @intFromEnum(Zir.Inst.Ref.bool_type)) << 32;
const as_usize = @as(u64, @intFromEnum(Zir.Inst.Ref.usize_type)) << 32;
const as_u8 = @as(u64, @intFromEnum(Zir.Inst.Ref.u8_type)) << 32;
const as_void = @as(u64, @intFromEnum(Zir.Inst.Ref.void_type)) << 32;
switch ((@as(u64, @intFromEnum(ty_inst)) << 32) | @as(u64, @intFromEnum(result))) {
as_ty | @intFromEnum(Zir.Inst.Ref.u1_type),
@ -10939,13 +10940,30 @@ fn rvalueInner(
as_ty | @intFromEnum(Zir.Inst.Ref.empty_struct_type),
as_comptime_int | @intFromEnum(Zir.Inst.Ref.zero),
as_comptime_int | @intFromEnum(Zir.Inst.Ref.one),
as_bool | @intFromEnum(Zir.Inst.Ref.bool_true),
as_bool | @intFromEnum(Zir.Inst.Ref.bool_false),
as_comptime_int | @intFromEnum(Zir.Inst.Ref.negative_one),
as_usize | @intFromEnum(Zir.Inst.Ref.zero_usize),
as_usize | @intFromEnum(Zir.Inst.Ref.one_usize),
as_u8 | @intFromEnum(Zir.Inst.Ref.zero_u8),
as_u8 | @intFromEnum(Zir.Inst.Ref.one_u8),
as_u8 | @intFromEnum(Zir.Inst.Ref.four_u8),
as_bool | @intFromEnum(Zir.Inst.Ref.bool_true),
as_bool | @intFromEnum(Zir.Inst.Ref.bool_false),
as_void | @intFromEnum(Zir.Inst.Ref.void_value),
=> return result, // type of result is already correct
as_usize | @intFromEnum(Zir.Inst.Ref.zero) => return .zero_usize,
as_u8 | @intFromEnum(Zir.Inst.Ref.zero) => return .zero_u8,
as_usize | @intFromEnum(Zir.Inst.Ref.one) => return .one_usize,
as_u8 | @intFromEnum(Zir.Inst.Ref.one) => return .one_u8,
as_comptime_int | @intFromEnum(Zir.Inst.Ref.zero_usize) => return .zero,
as_u8 | @intFromEnum(Zir.Inst.Ref.zero_usize) => return .zero_u8,
as_comptime_int | @intFromEnum(Zir.Inst.Ref.one_usize) => return .one,
as_u8 | @intFromEnum(Zir.Inst.Ref.one_usize) => return .one_u8,
as_comptime_int | @intFromEnum(Zir.Inst.Ref.zero_u8) => return .zero,
as_usize | @intFromEnum(Zir.Inst.Ref.zero_u8) => return .zero_usize,
as_comptime_int | @intFromEnum(Zir.Inst.Ref.one_u8) => return .one,
as_usize | @intFromEnum(Zir.Inst.Ref.one_u8) => return .one_usize,
// Need an explicit type coercion instruction.
else => return gz.addPlNode(ri.zirTag(), src_node, Zir.Inst.As{
.dest_type = ty_inst,