EnzymeAD/Enzyme

Add support for soft float

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#567 opened on Mar 15, 2022

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 (5 comments) (0 reactions) (0 assignees)LLVM (165 forks)github user discovery
good first issue

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Description

https://gcc.gnu.org/onlinedocs/gccint/Soft-float-library-routines.html

Adding support for mul and div would be a good start.

Runtime Function: complex float __mulsc3 (float a, float b, float c, float d)
Runtime Function: complex double __muldc3 (double a, double b, double c, double d)
Runtime Function: complex long double __multc3 (long double a, long double b, long double c, long double d)
Runtime Function: complex long double __mulxc3 (long double a, long double b, long double c, long double d)
These functions return the product of a + ib and c + id, following the rules of C99 Annex G.

Runtime Function: complex float __divsc3 (float a, float b, float c, float d)
Runtime Function: complex double __divdc3 (double a, double b, double c, double d)
Runtime Function: complex long double __divtc3 (long double a, long double b, long double c, long double d)
Runtime Function: complex long double __divxc3 (long double a, long double b, long double c, long double d)
These functions return the quotient of a + ib and c + id (i.e., (a + ib) / (c + id)), following the rules of C99 Annex G.

Contributor guide

Research direction
Implement the soft float complex multiplication and division functions ( mulsc3, muldc3, multc3, mulxc3, divsc3, divdc3, divtc3, divxc3) following the GCC documentation. Study the existing soft float library and compiler rt implementations for reference.
Tech stack
ccpp
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
CC++LLVM
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40