Actually the only cases that need the check are SCM_CELL_OBJECT_1 and SCM_SET_CELL_OBJECT_0. But perhaps there's some way to embed that asm business (in gc.h) into the SCM_VALIDATE_CELL macro. I haven't used "asm" before, but here's a suggestion that seems to work:
#define SCM_VALIDATE_CELL(cell, expr) ({ __asm__ __volatile__ ("" : : "g"
(cell)); expr; })
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