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| author | Michael Hudson-Doyle <michael.hudson@canonical.com> | 2022-08-12 11:29:31 +1200 |
|---|---|---|
| committer | Michael Hudson-Doyle <michael.hudson@canonical.com> | 2022-08-18 12:32:18 +1200 |
| commit | 2b274fd8c9c776cf70fcdb8356e678ada522a7b0 (patch) | |
| tree | b2e927948d5e45d4fb332712c49c34544097029a /sysdeps/ieee754/ldbl-128 | |
| parent | 1d7829991112ac32c28bc6e3c4f1695125c1aa44 (diff) | |
| download | glibc-2b274fd8c9c776cf70fcdb8356e678ada522a7b0.zip glibc-2b274fd8c9c776cf70fcdb8356e678ada522a7b0.tar.gz glibc-2b274fd8c9c776cf70fcdb8356e678ada522a7b0.tar.bz2 | |
Ensure calculations happen with desired rounding mode in y1lf128
math/test-float128-y1 fails on x86_64 and ppc64el with gcc 12 and -O3,
because code inside a block guarded by SET_RESTORE_ROUNDL is being moved
after the rounding mode has been restored. Use math_force_eval to
prevent this (and insert some math_opt_barrier calls to prevent code
from being moved before the rounding mode is set).
Fixes #29463
Reviewed-By: Wilco Dijkstra <Wilco.Dijkstra@arm.com>
Diffstat (limited to 'sysdeps/ieee754/ldbl-128')
| -rw-r--r-- | sysdeps/ieee754/ldbl-128/e_j1l.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/sysdeps/ieee754/ldbl-128/e_j1l.c b/sysdeps/ieee754/ldbl-128/e_j1l.c index 54c4576..9a9c5c6 100644 --- a/sysdeps/ieee754/ldbl-128/e_j1l.c +++ b/sysdeps/ieee754/ldbl-128/e_j1l.c @@ -869,10 +869,13 @@ __ieee754_y1l (_Float128 x) { /* 0 <= x <= 2 */ SET_RESTORE_ROUNDL (FE_TONEAREST); + xx = math_opt_barrier (xx); + x = math_opt_barrier (x); z = xx * xx; p = xx * neval (z, Y0_2N, NY0_2N) / deval (z, Y0_2D, NY0_2D); p = -TWOOPI / xx + p; p = TWOOPI * __ieee754_logl (x) * __ieee754_j1l (x) + p; + math_force_eval (p); return p; } |