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| author | Jacob McDonnell <jacob@jacobmcdonnell.com> | 2026-04-26 16:38:00 -0400 |
|---|---|---|
| committer | Jacob McDonnell <jacob@jacobmcdonnell.com> | 2026-04-26 16:38:00 -0400 |
| commit | 97d5c458cfa039d857301e1ca7d5af3beb37131d (patch) | |
| tree | b460cd850d0537eb71806ba30358840377b27688 /static/plan9-4e/man2/muldiv.2 | |
| parent | b89dc2331a50c63f8b33272a5c4c61ab98abdaa3 (diff) | |
build: Better Build System
Diffstat (limited to 'static/plan9-4e/man2/muldiv.2')
| -rw-r--r-- | static/plan9-4e/man2/muldiv.2 | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/static/plan9-4e/man2/muldiv.2 b/static/plan9-4e/man2/muldiv.2 new file mode 100644 index 00000000..93444bd5 --- /dev/null +++ b/static/plan9-4e/man2/muldiv.2 @@ -0,0 +1,31 @@ +.TH MULDIV 2 +.SH NAME +muldiv, umuldiv \- high-precision multiplication and division +.SH SYNOPSIS +.B #include <u.h> +.br +.B #include <libc.h> +.PP +.B +long muldiv(long a, long b, long c) +.PP +.B +ulong umuldiv(ulong a, ulong b, ulong c) +.SH DESCRIPTION +.I Muldiv +returns +.BR a*b/c , +using a +.B vlong +to hold the intermediate result. +.I Umuldiv +is the equivalent for unsigned integers. +They can be used to scale integer values without worry about +overflowing the intermediate result. +.PP +On some architectures, these routines can generate a trap if the +final result does not fit in a +.B long +or +.BR ulong ; +on others they will silently truncate. |