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iovisor / ubpf / 21882564574 / 1
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Ran 10 Feb 2026 09:19PM UTC
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09 Feb 2026 10:21PM UTC coverage: 76.462% (+2.4%) from 74.044%
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Implement MOVSX instruction support for CPU v4 (RFC 9669) (#760)

* Implement MOVSX support for validation, interpreter and JIT

Co-authored-by: Alan-Jowett <20480683+Alan-Jowett@users.noreply.github.com>

* Fix x86_64 JIT MOVSX - force REX prefix for byte register access

Co-authored-by: Alan-Jowett <20480683+Alan-Jowett@users.noreply.github.com>

* Format code with clang-format

Co-authored-by: Alan-Jowett <20480683+Alan-Jowett@users.noreply.github.com>

* Revert "Format code with clang-format"

This reverts commit 0f55b0593.

* Add CPU version v4 flag for MOVSX and RFC9669 conformance tests

Configure cmake/ctest to automatically run MOVSX and RFC9669 tests
with --cpu_version v4 flag. This ensures these v4 instruction tests
run with the correct CPU version instead of being skipped.

Tests affected:
- All movsx* tests (movsx832-reg, movsx1632-reg, movsx864-reg,
  movsx1664-reg, movsx3264-reg, rfc9669_movsx)
- All rfc9669_* conformance tests (88 tests total)

Co-authored-by: Alan-Jowett <20480683+Alan-Jowett@users.noreply.github.com>

* Fix type conversion portability in MOVSX interpreter

Add intermediate unsigned casts to make sign-extension behavior
well-defined across all platforms. Converting uint64_t directly to
int8_t/int16_t/int32_t is implementation-defined when the value
doesn't fit. Cast through uint8_t/uint16_t/uint32_t first to ensure
portable truncation before sign extension.

Co-authored-by: Alan-Jowett <20480683+Alan-Jowett@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: Alan-Jowett <20480683+Alan-Jowett@users.noreply.github.com>

4431 of 5795 relevant lines covered (76.46%)

45691.19 hits per line

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