examples/plot-delta-float/plot.c: Add exp2l, pow2l, exp10l, pow10l.
Revert to previous.
Improve logging for functions that do stack, like fp64_push/pop.
feat: Support OUT=abs. Simplify arg passing.
fix a bug in the previous commit.
feat: New syscall to help stack underflow detection.
fix a warning in tests/print/print-1.c.
fix build failure if no IEEE single is available.