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Avoid turning a floating point division with a constant power of two into a denormal multiplication.

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Some platforms may treat denormals as zero, on other platforms multiplication
with a subnormal is slower than dividing by a normal.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128555 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2011-03-30 17:02:54 +00:00
parent 546739656e
commit 8398512f89
3 changed files with 11 additions and 5 deletions
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6
unittests/ADT/APFloatTest.cpp
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@ -589,10 +589,8 @@ TEST(APFloatTest, exactInverse) {
EXPECT_TRUE(APFloat(1.17549435e-38f).getExactInverse(&inv));
EXPECT_TRUE(inv.bitwiseIsEqual(APFloat(8.5070592e+37f)));
// Large float
EXPECT_TRUE(APFloat(1.7014118e38f).getExactInverse(&inv));
EXPECT_TRUE(inv.bitwiseIsEqual(APFloat(5.8774718e-39f)));
// Large float, inverse is a denormal.
EXPECT_FALSE(APFloat(1.7014118e38f).getExactInverse(0));
// Zero
EXPECT_FALSE(APFloat(0.0).getExactInverse(0));
// Denormalized float