The object representation for floating-point values is implementation defined. However, an implementation that defines the __STDC_IEC_559__ macro shall conform to the IEC 60559 floating-point standard and uses what is frequently referred to as IEEE 754 floating-point arithmetic [ISO/IEC 9899:20112024]. The floating-point object representation used by IEC 60559 is one of the most common floating-point object representations in use today.
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Tool | Version | Checker | Description | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Astrée |
| memcmp-with-float | Partially checked | |||||||||||||||||
| Axivion Bauhaus Suite |
| CertC-FLP37 | Fully implemented | |||||||||||||||||
| Cppcheck Premium |
| premium-cert-flp37-c | Fully implemented | |||||||||||||||||
| Helix QAC |
| C5026 C++3118 | ||||||||||||||||||
| Klocwork |
| MISRA.STDLIB.MEMCMP.PTR_ARG_TYPES | ||||||||||||||||||
| LDRA tool suite |
| 618 S | Enhanced Enforcement | |||||||||||||||||
| Parasoft C/C++test |
| BD-PB-ARRAY, MISRA-101, CODSTA-190 | CERT_C-FLP37-c | Do not use object representations to compare floating-point values | ||||||||||||||||
| PC-lint Plus |
| 2498, 2499 | Fully supported | |||||||||||||||||
| Implemented
| R2018a | Memory comparison of float-point values | Object representation
| CERT C: Rule FLP37-C | Checks for memory comparison of floating-point values | can be different (same) for equal (not equal) floating-point valuesPRQA QA-C | 9.1 | 5026 | (rule fully covered) | ||||||||||
| PVS-Studio |
| V1014 | ||||||||||||||||||
| RuleChecker |
| memcmp-with-float | Partially checked | |||||||||||||||||
| TrustInSoft Analyzer |
| Exhaustively verified. |
Related Vulnerabilities
Search for vulnerabilities resulting from the violation of this rule on the CERT website.
Bibliography
| [ISO/IEC 9899:20112024] | Annex F, "ISO/IEC 60559 floating-point arithmetic" |
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