fix: 9-16B struct return via XMM registers (P1, macOS Intel)#45

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kolkov merged 8 commits into

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fix/sse-struct-return

May 13, 2026

Commits on May 13, 2026

asm: save XMM1 (f2) after CALL in syscall_unix_amd64.s
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ffi: extend CallNFloat and handleReturn to expose XMM1 (f2)
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types: add ReturnStRaxRdx/ReturnStRaxXmm0/ReturnStXmm0Rax/ReturnStXmm0Xmm1
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amd64: classify 9-16B struct returns by eightbyte composition
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amd64: implement four 9-16B struct return modes in handleReturn
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ffi: add C struct-return test functions and E2E tests for 9-16B returns
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docs: update CHANGELOG, README, ARCHITECTURE, PERFORMANCE, ROADMAP for SSE struct return (TASK-045)
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fix: Windows sret for 9-16B structs — Win64 ABI uses sret for all >8B
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