Unverified60% confidenceFactExact time
The C standard defines signed integer overflow as undefined behavior, allowing compilers to assume that loop counters never overflow in order to achieve better vectorization optimizations.
2
Sources
60%
Confidence
Long-term
Relevance
7/8/2026
First Seen
Sources
C语言可读性危机：奇技淫巧背后的工程反思
hackernewshackernews7/6/2026
Related Claims
UnverifiedC 和 C++ 标准将有符号整数溢出定义为未定义行为（Undefined Behavior）78% similarUnverifiedSigned integer overflow, out-of-bounds array reads and writes, dereferencing null or dangling pointers, violating sequence point rules, and reading uninitialized variables are all explicitly listed by the C standard as undefined behavior.75% similarUnverifiedOne of the goals of subinterpreters is to achieve true parallel execution without breaking compatibility with existing C extensions.73% similarUnverifiedThe compiler assumes that signed addition never overflows, thereby concluding that certain boundary conditions are unreachable and deleting the corresponding check branches, which is extremely common at -O2 and above.69% similarUnverifiedCFG 约束可以描述括号匹配、嵌套结构等编程语言语法，但相比正则约束其编译和推理成本会有所上升68% similar
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