SRC/dlaisnan.f(3)

🌸 NAME 🌸

okay so this is the page for SRC/dlaisnan.f from the Library Functions Manual, bestie 💖. The name on the tin is literally SRC/dlaisnan.f, and the whole page is about dlaisnan — a logical function that tests input for NaN by comparing two arguments for inequality. That’s the vibe. ✨

✨ SYNOPSIS ✨

🫶 Functions/Subroutines 🫶

• logical function dlaisnan (din1, din2) — DLAISNAN tests input for NaN by comparing two arguments for inequality. 💅

🧚 Function/Subroutine Documentation 🧚

logical function dlaisnan (double precision, intent(in) din1, double precision, intent(in) din2)

DLAISNAN tests input for NaN by comparing two arguments for inequality. Periodt. 💖

🎀 Purpose 🎀

ok so the source is very clear about this, no cap:

This routine is not for general use. It exists solely to avoid over-optimization in DISNAN.

DLAISNAN checks for NaNs by comparing its two arguments for inequality. NaN is the only floating-point value where NaN != NaN returns .TRUE.. To check for NaNs, pass the same variable as both arguments. 🫶

A compiler must assume that the two arguments are not the same variable, and the test will not be optimized away. Interprocedural or whole-program optimization may delete this test. The ISNAN functions will be replaced by the correct Fortran 03 intrinsic once the intrinsic is widely available. 🌈

💜 Parameters 💜

🍓 DIN1 🍓

DIN1 is DOUBLE PRECISION.

🦋 DIN2 🦋

DIN2 is DOUBLE PRECISION. Two numbers to compare for inequality.

👑 Author 👑

• Univ. of Tennessee
• Univ. of California Berkeley
• Univ. of Colorado Denver
• NAG Ltd.

⭐ Definition ⭐

Definition at line 73 of file dlaisnan.f.

💫 Author 💫

Generated automatically by Doxygen for LAPACK from the source code.

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and that’s the whole read, bestie! Footer sign-off energy: LAPACK Version 3.12.0, source SRC/dlaisnan.f(3) — mwah, slay, bye 💋🎀✨