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Drop the limitation to IEEE floating point types from the fdiv of pow2 -> fmul transform.

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This is safe for x87 long doubles and ppc double doubles too.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167582 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2012-11-08 13:58:10 +00:00
parent 214fd3d244
commit 6b370e615c
2 changed files with 6 additions and 5 deletions
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5
lib/Support/APFloat.cpp
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@ -3553,11 +3553,6 @@ void APFloat::toString(SmallVectorImpl<char> &Str,
} }
bool APFloat::getExactInverse(APFloat *inv) const { bool APFloat::getExactInverse(APFloat *inv) const {
// We can only guarantee the existence of an exact inverse for IEEE floats.
if (semantics != &IEEEhalf && semantics != &IEEEsingle &&
semantics != &IEEEdouble && semantics != &IEEEquad)
return false;
// Special floats and denormals have no exact inverse. // Special floats and denormals have no exact inverse.
if (category != fcNormal) if (category != fcNormal)
return false; return false;

6
unittests/ADT/APFloatTest.cpp
View File

@ -635,6 +635,12 @@ TEST(APFloatTest, exactInverse) {
EXPECT_TRUE(inv.bitwiseIsEqual(APFloat(0.5))); EXPECT_TRUE(inv.bitwiseIsEqual(APFloat(0.5)));
EXPECT_TRUE(APFloat(2.0f).getExactInverse(&inv)); EXPECT_TRUE(APFloat(2.0f).getExactInverse(&inv));
EXPECT_TRUE(inv.bitwiseIsEqual(APFloat(0.5f))); EXPECT_TRUE(inv.bitwiseIsEqual(APFloat(0.5f)));
EXPECT_TRUE(APFloat(APFloat::IEEEquad, "2.0").getExactInverse(&inv));
EXPECT_TRUE(inv.bitwiseIsEqual(APFloat(APFloat::IEEEquad, "0.5")));
EXPECT_TRUE(APFloat(APFloat::PPCDoubleDouble, "2.0").getExactInverse(&inv));
EXPECT_TRUE(inv.bitwiseIsEqual(APFloat(APFloat::PPCDoubleDouble, "0.5")));
EXPECT_TRUE(APFloat(APFloat::x87DoubleExtended, "2.0").getExactInverse(&inv));
EXPECT_TRUE(inv.bitwiseIsEqual(APFloat(APFloat::x87DoubleExtended, "0.5")));
// FLT_MIN // FLT_MIN
EXPECT_TRUE(APFloat(1.17549435e-38f).getExactInverse(&inv)); EXPECT_TRUE(APFloat(1.17549435e-38f).getExactInverse(&inv));