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* [Bug math/30066] New: Inaccurate asin computation.
@ 2023-02-01 13:35 kspalaiologos at gmail dot com
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From: kspalaiologos at gmail dot com @ 2023-02-01 13:35 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=30066
Bug ID: 30066
Summary: Inaccurate asin computation.
Product: glibc
Version: 2.36
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: math
Assignee: unassigned at sourceware dot org
Reporter: kspalaiologos at gmail dot com
Target Milestone: ---
Consider the following code:
--
#include <stdio.h>
#include <math.h>
int main(void) {
printf("%a\n", asin(sin(1.5)));
printf("%a\n", acos(cos(1.5)));
printf("%a\n", atan(tan(1.5)));
--
The output of it is slightly incorrect as follows:
--
0x1.8000000000001p+0
0x1.8p+0
0x1.8p+0
--
This issue seems to be dependent on the argument, since (for instance) as we
let x=0.6:
--
0x1.3333333333333p-1
0x1.3333333333333p-1
0x1.3333333333333p-1
--
--
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2023-02-01 13:35 [Bug math/30066] New: Inaccurate asin computation kspalaiologos at gmail dot com
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