Timm Baeder 32fc625a3f Reapply "Reapply "[clang][bytecode] Allocate IntegralAP and Floating … (#145014) ...

…types usi… (#144676)"

This reverts commit 68471d29ee.

IntegralAP contains a union:
  union {
    uint64_t *Memory = nullptr;
    uint64_t Val;
  };

On 64bit systems, both Memory and Val have the same size. However, on 32
bit system, Val is 64bit and Memory only 32bit. Which means the default
initializer for Memory will only zero half of Val. We fixed this by
zero-initializing Val explicitly in the IntegralAP(unsigned BitWidth)
constructor.


See also the discussion in
https://github.com/llvm/llvm-project/pull/144246

2025-06-20 18:06:01 +02:00

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