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std.Io.Reader: work around llvm backend bug

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tracked by #25067 and I already have a fix cooking in another branch
This commit is contained in:
Andrew Kelley 2025-08-28 18:29:48 -07:00
parent 46b60dc069
commit 530cc2c111
1 changed files with 10 additions and 2 deletions
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12
lib/std/Io/Reader.zig
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@ -1163,7 +1163,11 @@ pub inline fn takeStruct(r: *Reader, comptime T: type, endian: std.builtin.Endia
.@"struct" => |info| switch (info.layout) {
.auto => @compileError("ill-defined memory layout"),
.@"extern" => {
var res = (try r.takeStructPointer(T)).*;
// This code works around https://github.com/ziglang/zig/issues/25067
// by avoiding a call to `peekStructPointer`.
const struct_bytes = try r.takeArray(@sizeOf(T));
var res: T = undefined;
@memcpy(@as([]u8, @ptrCast(&res)), struct_bytes);
if (native_endian != endian) std.mem.byteSwapAllFields(T, &res);
return res;
},
@ -1188,7 +1192,11 @@ pub inline fn peekStruct(r: *Reader, comptime T: type, endian: std.builtin.Endia
.@"struct" => |info| switch (info.layout) {
.auto => @compileError("ill-defined memory layout"),
.@"extern" => {
var res = (try r.peekStructPointer(T)).*;
// This code works around https://github.com/ziglang/zig/issues/25067
// by avoiding a call to `peekStructPointer`.
const struct_bytes = try r.peekArray(@sizeOf(T));
var res: T = undefined;
@memcpy(@as([]u8, @ptrCast(&res)), struct_bytes);
if (native_endian != endian) std.mem.byteSwapAllFields(T, &res);
return res;
},