54 lines
2 KiB
Diff
54 lines
2 KiB
Diff
From 3e279192749cfcae4ceebb1f21a3275e677d0561 Mon Sep 17 00:00:00 2001
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From: Michael Hudson-Doyle <michael.hudson@canonical.com>
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Date: Fri, 12 Aug 2022 11:29:31 +1200
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Subject: [PATCH 58/81] Ensure calculations happen with desired rounding mode
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in y1lf128
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math/test-float128-y1 fails on x86_64 and ppc64el with gcc 12 and -O3,
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because code inside a block guarded by SET_RESTORE_ROUNDL is being moved
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after the rounding mode has been restored. Use math_force_eval to
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prevent this (and insert some math_opt_barrier calls to prevent code
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from being moved before the rounding mode is set).
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Fixes #29463
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Reviewed-By: Wilco Dijkstra <Wilco.Dijkstra@arm.com>
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(cherry picked from commit 2b274fd8c9c776cf70fcdb8356e678ada522a7b0)
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---
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NEWS | 1 +
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sysdeps/ieee754/ldbl-128/e_j1l.c | 3 +++
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2 files changed, 4 insertions(+)
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diff --git a/NEWS b/NEWS
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index 63e26d7062..bea1d8a11f 100644
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--- a/NEWS
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+++ b/NEWS
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@@ -24,6 +24,7 @@ The following bugs are resolved with this release:
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[29446] _dlopen now ignores dl_caller argument in static mode
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[29485] Linux: Terminate subprocess on late failure in tst-pidfd
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[29490] alpha: New __brk_call implementation is broken
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+ [29463] math/test-float128-y1 fails on x86_64
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[29528] elf: Call __libc_early_init for reused namespaces
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[29537] libc: [2.34 regression]: Alignment issue on m68k when using
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[29539] libc: LD_TRACE_LOADED_OBJECTS changed how vDSO library are
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diff --git a/sysdeps/ieee754/ldbl-128/e_j1l.c b/sysdeps/ieee754/ldbl-128/e_j1l.c
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index 54c457681a..9a9c5c6f00 100644
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--- a/sysdeps/ieee754/ldbl-128/e_j1l.c
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+++ b/sysdeps/ieee754/ldbl-128/e_j1l.c
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@@ -869,10 +869,13 @@ __ieee754_y1l (_Float128 x)
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{
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/* 0 <= x <= 2 */
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SET_RESTORE_ROUNDL (FE_TONEAREST);
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+ xx = math_opt_barrier (xx);
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+ x = math_opt_barrier (x);
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z = xx * xx;
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p = xx * neval (z, Y0_2N, NY0_2N) / deval (z, Y0_2D, NY0_2D);
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p = -TWOOPI / xx + p;
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p = TWOOPI * __ieee754_logl (x) * __ieee754_j1l (x) + p;
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+ math_force_eval (p);
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return p;
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}
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--
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2.19.1.6.gb485710b
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