/usr/lib/x86_64-linux-gnu/ivl/v2005_math.sft is in iverilog 0.9.7-1.
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# This is the system function descriptor table for the
# Verilog-2005 math functions.
#
# Single argument functions.
$sqrt vpiSysFuncReal
$ln vpiSysFuncReal
$log10 vpiSysFuncReal
$exp vpiSysFuncReal
$ceil vpiSysFuncReal
$floor vpiSysFuncReal
$sin vpiSysFuncReal
$cos vpiSysFuncReal
$tan vpiSysFuncReal
$asin vpiSysFuncReal
$acos vpiSysFuncReal
$atan vpiSysFuncReal
$sinh vpiSysFuncReal
$cosh vpiSysFuncReal
$tanh vpiSysFuncReal
$asinh vpiSysFuncReal
$acosh vpiSysFuncReal
$atanh vpiSysFuncReal
# Double argument functions.
$pow vpiSysFuncReal
$atan2 vpiSysFuncReal
$hypot vpiSysFuncReal
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