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[PULL 03/44] host-utils: introduce uabs64()
From: |
David Gibson |
Subject: |
[PULL 03/44] host-utils: introduce uabs64() |
Date: |
Thu, 30 Sep 2021 15:43:45 +1000 |
From: Luis Pires <luis.pires@eldorado.org.br>
Introduce uabs64(), a function that returns the absolute value of
a 64-bit int as an unsigned value. This avoids the undefined behavior
for common abs implementations, where abs of the most negative value is
undefined.
Signed-off-by: Luis Pires <luis.pires@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20210910112624.72748-4-luis.pires@eldorado.org.br>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
include/qemu/host-utils.h | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/include/qemu/host-utils.h b/include/qemu/host-utils.h
index 753b9fb89f..ca9f3f021b 100644
--- a/include/qemu/host-utils.h
+++ b/include/qemu/host-utils.h
@@ -357,6 +357,14 @@ static inline uint64_t revbit64(uint64_t x)
#endif
}
+/**
+ * Return the absolute value of a 64-bit integer as an unsigned 64-bit value
+ */
+static inline uint64_t uabs64(int64_t v)
+{
+ return v < 0 ? -v : v;
+}
+
/**
* sadd32_overflow - addition with overflow indication
* @x, @y: addends
--
2.31.1
- [PULL 01/44] host-utils: Fix overflow detection in divu128(), (continued)
- [PULL 01/44] host-utils: Fix overflow detection in divu128(), David Gibson, 2021/09/30
- [PULL 05/44] ppc/spapr: Add a POWER10 DD2 CPU, David Gibson, 2021/09/30
- [PULL 11/44] docs/system: ppc: Update the URL for OpenPOWER firmware images, David Gibson, 2021/09/30
- [PULL 04/44] i386/kvm: Replace abs64() with uabs64() from host-utils, David Gibson, 2021/09/30
- [PULL 10/44] ppc/pnv: Rename "id" to "quad-id" in PnvQuad, David Gibson, 2021/09/30
- [PULL 06/44] ppc/pnv: Add a comment on the "primary-topology-index" property, David Gibson, 2021/09/30
- [PULL 02/44] host-utils: fix missing zero-extension in divs128, David Gibson, 2021/09/30
- [PULL 07/44] ppc/pnv: Remove useless variable, David Gibson, 2021/09/30
- [PULL 14/44] memory_hotplug.c: handle dev->id = NULL in acpi_memory_hotplug_write(), David Gibson, 2021/09/30
- [PULL 16/44] spapr_drc.c: do not error_report() when drc->dev->id == NULL, David Gibson, 2021/09/30
- [PULL 03/44] host-utils: introduce uabs64(),
David Gibson <=
- [PULL 12/44] ppc/pnv: Add an assert when calculating the RAM distribution on chips, David Gibson, 2021/09/30
- [PULL 13/44] target/ppc: fix setting of CR flags in bcdcfsq, David Gibson, 2021/09/30
- [PULL 18/44] qapi/qdev.json: add DEVICE_UNPLUG_GUEST_ERROR QAPI event, David Gibson, 2021/09/30
- [PULL 20/44] memory_hotplug.c: send DEVICE_UNPLUG_GUEST_ERROR in acpi_memory_hotplug_write(), David Gibson, 2021/09/30
- [PULL 09/44] ppc/xive: Export xive_tctx_word2() helper, David Gibson, 2021/09/30
- [PULL 15/44] spapr.c: handle dev->id in spapr_memory_unplug_rollback(), David Gibson, 2021/09/30
- [PULL 19/44] spapr: use DEVICE_UNPLUG_GUEST_ERROR to report unplug errors, David Gibson, 2021/09/30
- [PULL 25/44] spapr_numa.c: split FORM1 code into helpers, David Gibson, 2021/09/30
- [PULL 17/44] qapi/qdev.json: fix DEVICE_DELETED parameters doc, David Gibson, 2021/09/30
- [PULL 08/44] ppc/xive: Export priority_to_ipb() helper, David Gibson, 2021/09/30