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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2011-03-30 17:02:54 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2011-03-30 17:02:54 +0000 |
| commit | af0ed953c57d1a29e8ad08cec039df7c0d59e193 (patch) | |
| tree | eca022d79b46f963cac817b76ba07ebef84e036e /llvm/unittests/ADT/APFloatTest.cpp | |
| parent | 20688ccc4869f7d85681cbbf13e3878784d6aab8 (diff) | |
| download | bcm5719-llvm-af0ed953c57d1a29e8ad08cec039df7c0d59e193.tar.gz bcm5719-llvm-af0ed953c57d1a29e8ad08cec039df7c0d59e193.zip | |
Avoid turning a floating point division with a constant power of two into a denormal multiplication.
Some platforms may treat denormals as zero, on other platforms multiplication
with a subnormal is slower than dividing by a normal.
llvm-svn: 128555
Diffstat (limited to 'llvm/unittests/ADT/APFloatTest.cpp')
| -rw-r--r-- | llvm/unittests/ADT/APFloatTest.cpp | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/llvm/unittests/ADT/APFloatTest.cpp b/llvm/unittests/ADT/APFloatTest.cpp index dea4a65b88a..5f05b861693 100644 --- a/llvm/unittests/ADT/APFloatTest.cpp +++ b/llvm/unittests/ADT/APFloatTest.cpp @@ -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 |
