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devtools/fp16: conversion tool for fp16 format.

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We use this in gossmap to represent htlc max/min approximations.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2022-03-21 11:28:28 +10:30
parent 42f91ff2fa
commit 35cca73d2f
2 changed files with 48 additions and 1 deletions
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4
devtools/Makefile
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@@ -1,4 +1,4 @@
DEVTOOLS := devtools/bolt11-cli devtools/decodemsg devtools/onion devtools/dump-gossipstore devtools/gossipwith devtools/create-gossipstore devtools/mkcommit devtools/mkfunding devtools/mkclose devtools/mkgossip devtools/mkencoded devtools/mkquery devtools/lightning-checkmessage devtools/topology devtools/route devtools/blindedpath devtools/bolt12-cli devtools/encodeaddr devtools/features
DEVTOOLS := devtools/bolt11-cli devtools/decodemsg devtools/onion devtools/dump-gossipstore devtools/gossipwith devtools/create-gossipstore devtools/mkcommit devtools/mkfunding devtools/mkclose devtools/mkgossip devtools/mkencoded devtools/mkquery devtools/lightning-checkmessage devtools/topology devtools/route devtools/blindedpath devtools/bolt12-cli devtools/encodeaddr devtools/features devtools/fp16
ifeq ($(HAVE_SQLITE3),1)
DEVTOOLS += devtools/checkchannels
endif
@@ -49,6 +49,8 @@ DEVTOOLS_COMMON_OBJS := \
devtools/features: $(CCAN_OBJS) common/features.o common/utils.o wire/fromwire.o wire/towire.o devtools/features.o
devtools/fp16: $(CCAN_OBJS) common/fp16.o common/utils.o common/setup.o common/autodata.o devtools/fp16.o
devtools/bolt11-cli: $(DEVTOOLS_COMMON_OBJS) $(JSMN_OBJS) $(CCAN_OBJS) $(BITCOIN_OBJS) wire/fromwire.o wire/towire.o devtools/bolt11-cli.o
devtools/encodeaddr: common/utils.o common/bech32.o devtools/encodeaddr.o

45
devtools/fp16.c Normal file
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@@ -0,0 +1,45 @@
/* Simple tool to convert to/from our internal fp16 representation */
#include "config.h"
#include <ccan/err/err.h>
#include <ccan/opt/opt.h>
#include <common/fp16.h>
#include <common/setup.h>
#include <common/type_to_string.h>
#include <inttypes.h>
#include <stdio.h>
int main(int argc, char *argv[])
{
fp16_t fp16val;
u64 u64min, u64max;
char *endp;
common_setup(argv[0]);
opt_register_noarg("-h|--help", opt_usage_and_exit,
"[fp16:val|value]\n"
"Converts to/from fp16, indicates ranges",
"Get usage information");
opt_parse(&argc, argv, opt_log_stderr_exit);
if (argc != 2)
opt_usage_exit_fail("Expect 1 argument");
if (strstarts(argv[1], "fp16:"))
fp16val = strtoul(argv[1] + 5, &endp, 0);
else
fp16val = u64_to_fp16(strtoul(argv[1], &endp, 0), false);
if (*endp)
opt_usage_exit_fail("Expect valid number");
u64min = u64max = fp16_to_u64(fp16val);
while (u64_to_fp16(u64min-1, false) == fp16val)
u64min--;
while (u64_to_fp16(u64max+1, false) == fp16val)
u64max++;
printf("fp16:0x%x\n"
"min %"PRIu64"\n"
"max %"PRIu64"\n",
fp16val, u64min, u64max);
common_shutdown();
}