cmd/compile: don't mark argument array as noalg

It ends up making two similar types, [N]uint8 of both
alg and noalg varieties. Comparsions between the two then
don't come out equal when they should.
In particular, the type *[N]uint8 has an Elem pointer which
must point to one of the above two types; it can't point to both.
Thus allocating a *[N]uint8 and dereferencing it might be a
different type than a [N]uint8.

The fix is easy. Making a small test for this is really hard. It
requires that both a argless defer and the test be imported by a
common parent package. This is why a main binary doesn't see this
issue, but a test does (as Agniva noticed), because there's a wrapper
package that imports both the test and the defer.

Types like [N]uint8 don't really need to be marked noalg anyway,
as the generated code (if any) will be shared among all
vanilla memory types of the same size.

Fixes #32595

Change-Id: If7b77fa6ed56cd4495601c3f90170682d853b82f
Run-TryBot: Keith Randall <>
Reviewed-by: Emmanuel Odeke <>
Reviewed-by: Cherry Zhang <>
TryBot-Result: Gobot Gobot <>
5 files changed
tree: 2cf02ce735c5aadc59079fbdbfc762855140e486
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  13. favicon.ico
  17. robots.txt

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