https://bugs.llvm.org/show_bug.cgi?id=46802
Bug ID: 46802
Summary: ARM long double arithmetic done wrong
Product: clang
Version: 10.0
Hardware: Other
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C
Assignee: unassignedclangb...@nondot.org
Reporter: tyde...@tybor.com
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
/*
* Signed zero long double bug. All output should be +inf.
*/
#include <fenv.h>
#include <stdio.h>
static long double ld_P0 = +0.L;
static long double ld_M0 = -0.L;
static long double ld_pone = +1.L;
int main(void){
long double ld23;
int rnd_rc;
(void)printf("ld_M0=%Lg, ld_pone=%Lg\n", ld_M0, ld_pone);
ld23 = ld_P0 + ld_P0*ld_pone;
(void)printf("1/ld23=%Lg\n", 1.L/ld23);
ld23 = -ld_M0 - ld_M0*ld_pone;
(void)printf("1/ld23=%Lg\n", 1.L/ld23);
rnd_rc = fesetround( FE_DOWNWARD );
ld23 = ld_P0 + ld_P0*ld_pone;
(void)printf("1/ld23=%Lg\n", 1.L/ld23);
ld23 = -ld_M0 - ld_M0*ld_pone; /* bug */
(void)printf("1/ld23=%Lg\n", 1.L/ld23);
return 0;
}
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