Verified65% confidenceFactExact time
On x86-64 Linux, the C ABI follows the System V AMD64 ABI specification: the first 6 integer/pointer arguments are passed via the RDI, RSI, RDX, RCX, R8, and R9 registers, floating-point arguments are passed via XMM0–XMM7, and the return value is placed in RAX.
3
Sources
65%
Confidence
Long-term
Relevance
8/7/2026
First Seen
Sources
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