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[ADT] Add the scalbn function for APFloat.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219473 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth
2014-10-10 04:54:30 +00:00
parent 9ea4dd2eed
commit cb84b21243
3 changed files with 66 additions and 2 deletions
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43
unittests/ADT/APFloatTest.cpp
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@ -2742,4 +2742,47 @@ TEST(APFloatTest, logb) {
EXPECT_TRUE(APFloat(APFloat::IEEEsingle, "-0x7Ep+0")
.bitwiseIsEqual(logb(MSmallestNormalized)));
}
TEST(APFloatTest, scalbn) {
EXPECT_TRUE(
APFloat(APFloat::IEEEsingle, "0x1p+0")
.bitwiseIsEqual(scalbn(APFloat(APFloat::IEEEsingle, "0x1p+0"), 0)));
EXPECT_TRUE(
APFloat(APFloat::IEEEsingle, "0x1p+42")
.bitwiseIsEqual(scalbn(APFloat(APFloat::IEEEsingle, "0x1p+0"), 42)));
EXPECT_TRUE(
APFloat(APFloat::IEEEsingle, "0x1p-42")
.bitwiseIsEqual(scalbn(APFloat(APFloat::IEEEsingle, "0x1p+0"), -42)));
APFloat PInf = APFloat::getInf(APFloat::IEEEsingle, false);
APFloat MInf = APFloat::getInf(APFloat::IEEEsingle, true);
APFloat PZero = APFloat::getZero(APFloat::IEEEsingle, false);
APFloat MZero = APFloat::getZero(APFloat::IEEEsingle, true);
APFloat QPNaN = APFloat::getNaN(APFloat::IEEEsingle, false);
APFloat QMNaN = APFloat::getNaN(APFloat::IEEEsingle, true);
APFloat SNaN = APFloat::getSNaN(APFloat::IEEEsingle, false);
EXPECT_TRUE(PInf.bitwiseIsEqual(scalbn(PInf, 0)));
EXPECT_TRUE(MInf.bitwiseIsEqual(scalbn(MInf, 0)));
EXPECT_TRUE(PZero.bitwiseIsEqual(scalbn(PZero, 0)));
EXPECT_TRUE(MZero.bitwiseIsEqual(scalbn(MZero, 0)));
EXPECT_TRUE(QPNaN.bitwiseIsEqual(scalbn(QPNaN, 0)));
EXPECT_TRUE(QMNaN.bitwiseIsEqual(scalbn(QMNaN, 0)));
EXPECT_TRUE(SNaN.bitwiseIsEqual(scalbn(SNaN, 0)));
EXPECT_TRUE(
PInf.bitwiseIsEqual(scalbn(APFloat(APFloat::IEEEsingle, "0x1p+0"), 128)));
EXPECT_TRUE(MInf.bitwiseIsEqual(
scalbn(APFloat(APFloat::IEEEsingle, "-0x1p+0"), 128)));
EXPECT_TRUE(
PInf.bitwiseIsEqual(scalbn(APFloat(APFloat::IEEEsingle, "0x1p+127"), 1)));
EXPECT_TRUE(PZero.bitwiseIsEqual(
scalbn(APFloat(APFloat::IEEEsingle, "0x1p+0"), -127)));
EXPECT_TRUE(MZero.bitwiseIsEqual(
scalbn(APFloat(APFloat::IEEEsingle, "-0x1p+0"), -127)));
EXPECT_TRUE(PZero.bitwiseIsEqual(
scalbn(APFloat(APFloat::IEEEsingle, "0x1p-126"), -1)));
EXPECT_TRUE(PZero.bitwiseIsEqual(
scalbn(APFloat(APFloat::IEEEsingle, "0x1p-126"), -1)));
}
}