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authorErik Verbruggen <erik.verbruggen@theqtcompany.com>2015-08-10 13:15:24 +0200
committerErik Verbruggen <erik.verbruggen@theqtcompany.com>2015-10-30 13:07:19 +0000
commita2b58c1643b5c8b67cb18750ef2d565180a3a179 (patch)
tree58d598bdc5c897ef2b4ae6105b05796e832d72c6 /tests/auto/corelib/global/qnumeric/tst_qnumeric.cpp
parent0659bb810beec671dc7167e3066ad3646ef5ca8b (diff)
Implement qt_is_{inf,nan,finite} using std. library functions.
The previous implementations did not check the full mantissa. The result was that certain NaN values were seen as +/-Infinity. A nice benefit is that the generated code for this implementation is also faster. Task-number: QTBUG-47692 Change-Id: I1507ec579ccd9a2ab97da8cf83dabbc5d6e28597 Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>
Diffstat (limited to 'tests/auto/corelib/global/qnumeric/tst_qnumeric.cpp')
-rw-r--r--tests/auto/corelib/global/qnumeric/tst_qnumeric.cpp12
1 files changed, 12 insertions, 0 deletions
diff --git a/tests/auto/corelib/global/qnumeric/tst_qnumeric.cpp b/tests/auto/corelib/global/qnumeric/tst_qnumeric.cpp
index 6be8ff81cf..01ff3a6c7e 100644
--- a/tests/auto/corelib/global/qnumeric/tst_qnumeric.cpp
+++ b/tests/auto/corelib/global/qnumeric/tst_qnumeric.cpp
@@ -105,6 +105,18 @@ void tst_QNumeric::qNan()
QVERIFY(qIsNaN(nan));
QVERIFY(qIsNaN(nan + 1));
QVERIFY(qIsNaN(-nan));
+
+ Q_STATIC_ASSERT(sizeof(double) == 8);
+#ifdef Q_LITTLE_ENDIAN
+ const uchar bytes[] = { 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 0x7f };
+#else
+ const uchar bytes[] = { 0x7f, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 };
+#endif
+ memcpy(&nan, bytes, 8);
+ QVERIFY(!qIsFinite(nan));
+ QVERIFY(!qIsInf(nan));
+ QVERIFY(qIsNaN(nan));
+
double inf = qInf();
QVERIFY(inf > 0);
QVERIFY(-inf < 0);