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x86_64: enable struct field reordering

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The blocker for enabling this feature was my need to debug the emitted
assembly without debug info and having to manually inspect memory to
determine struct contents.  However, we now have debug info!

    (lldb) v -L foo bar
    0x00007fffffffda20: (repro.repro.Foo) foo = {
    0x00007fffffffda24:   .x = 12
    0x00007fffffffda20:   .y = 34
    }
    0x00007fffffffda28: (repro.repro.Bar) bar = {
    0x00007fffffffda28:   .x = 56
    0x00007fffffffda2c:   .y = 78
    }

Updates #21530
This commit is contained in:
Jacob Young 2025-01-18 01:56:36 -05:00 committed by Andrew Kelley
parent 3dadb8c4c9
commit a446101677
1 changed files with 1 additions and 1 deletions
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src/target.zig
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@ -720,7 +720,7 @@ pub inline fn backendSupportsFeature(backend: std.builtin.CompilerBackend, compt
else => false,
},
.field_reordering => switch (backend) {
.stage2_c, .stage2_llvm => true,
.stage2_c, .stage2_llvm, .stage2_x86_64 => true,
else => false,
},
.safety_checked_instructions => switch (backend) {