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51702e6e75
v2: Use constant and multiplication instead of division v3: Use hex constants Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu> llvm-svn: 227585
14 lines
445 B
C++
14 lines
445 B
C++
_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE log10(__CLC_GENTYPE val) {
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// log10(x) = log2(x) / log2(10)
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// 1 / log2(10) = 0.30102999566 = log10(2)
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// SP representation is 0.30103 (0x1.344136p-2)
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// DP representation is 0.301029995659999993762312442414(0x1.34413509E61D8p-2)
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#if __CLC_FPSIZE == 32
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return log2(val) * 0x1.344136p-2f;
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#elif __CLC_FPSIZE == 64
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return log2(val) * 0x1.34413509E61D8p-2;
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#else
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#error unknown _CLC_FPSIZE
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#endif
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}
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