2023-06-22 20:10:36 +00:00
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From 1acfca06f0dbbc586f0d86833196a4463dc8b8c2 Mon Sep 17 00:00:00 2001
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2023-05-24 18:04:22 +00:00
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From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= <clg@redhat.com>
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Date: Tue, 23 May 2023 12:34:33 +0200
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2023-06-22 20:10:36 +00:00
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Subject: [PATCH 15/22] target/s390x: fix handling of zeroes in vfmin/vfmax
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2023-05-24 18:04:22 +00:00
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Cédric Le Goater <clg@redhat.com>
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RH-MergeRequest: 279: Backport latest s390x-related fixes from upstream QEMU for qemu-kvm in RHEL 8.9
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2023-06-22 20:10:36 +00:00
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RH-Bugzilla: 2169308 2209605
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2023-05-24 18:04:22 +00:00
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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2023-06-22 20:10:36 +00:00
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RH-Acked-by: David Hildenbrand <david@redhat.com>
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Commit: [14/21] 27f66691e08192a5c9f2ecbde3603c0adece4857
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2023-05-24 18:04:22 +00:00
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Bugzilla: https://bugzilla.redhat.com/2169308
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commit 13c59eb09bd6d1fbc13f08b708226421f14a232b
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Author: Ilya Leoshkevich <iii@linux.ibm.com>
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Date: Wed Jul 13 20:26:10 2022 +0200
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target/s390x: fix handling of zeroes in vfmin/vfmax
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vfmin_res() / vfmax_res() are trying to check whether a and b are both
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zeroes, but in reality they check that they are the same kind of zero.
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This causes incorrect results when comparing positive and negative
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zeroes.
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Fixes: da4807527f3b ("s390x/tcg: Implement VECTOR FP (MAXIMUM|MINIMUM)")
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Co-developed-by: Ulrich Weigand <ulrich.weigand@de.ibm.com>
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Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
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Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
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Reviewed-by: David Hildenbrand <david@redhat.com>
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Message-Id: <20220713182612.3780050-2-iii@linux.ibm.com>
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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Signed-off-by: Cédric Le Goater <clg@redhat.com>
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---
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target/s390x/tcg/vec_fpu_helper.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/target/s390x/tcg/vec_fpu_helper.c b/target/s390x/tcg/vec_fpu_helper.c
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index 1a77993471..d1249706f9 100644
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--- a/target/s390x/tcg/vec_fpu_helper.c
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+++ b/target/s390x/tcg/vec_fpu_helper.c
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@@ -794,7 +794,7 @@ static S390MinMaxRes vfmin_res(uint16_t dcmask_a, uint16_t dcmask_b,
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default:
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g_assert_not_reached();
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}
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- } else if (unlikely(dcmask_a & dcmask_b & DCMASK_ZERO)) {
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+ } else if (unlikely((dcmask_a & DCMASK_ZERO) && (dcmask_b & DCMASK_ZERO))) {
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switch (type) {
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case S390_MINMAX_TYPE_JAVA:
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return neg_a ? S390_MINMAX_RES_A : S390_MINMAX_RES_B;
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@@ -844,7 +844,7 @@ static S390MinMaxRes vfmax_res(uint16_t dcmask_a, uint16_t dcmask_b,
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default:
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g_assert_not_reached();
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}
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- } else if (unlikely(dcmask_a & dcmask_b & DCMASK_ZERO)) {
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+ } else if (unlikely((dcmask_a & DCMASK_ZERO) && (dcmask_b & DCMASK_ZERO))) {
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const bool neg_a = dcmask_a & DCMASK_NEGATIVE;
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switch (type) {
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--
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2.37.3
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