For a compiler which ostensibly has a register allocator that is wild. Why are x13 and x14 involved at all? Why is it moving the return into x13 at the end?
06.02.2026 08:02
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For a compiler which ostensibly has a register allocator that is wild. Why are x13 and x14 involved at all? Why is it moving the return into x13 at the end?
Claude’s C compiler is impressive in many ways, but the inefficiency of its codegen may be a little understated. For:
unsigned long foo(unsigned long a, unsigned long b) { return a + b; }
It generates the following arm64:
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