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Use __builtin_clzll to count the leading zero bits, the data is based on

Description

Use builtin_clzll to count the leading zero bits, the data is based on
long long so
builtin_clz will return an incorrect value.

Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D3375

Details

Provenance
andrewAuthored on
Reviewer
emaste
Differential Revision
D3375: Use __builtin_clzll in __floatditf and __floatunditf
Parents
rS286778: Minor code refactor to avoid duplicating code.
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