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straightens potential range issues for wide integers

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This commit is contained in:
tosh 2013-03-27 15:47:39 +01:00
parent eac8c99ee1
commit f98cd10485
1 changed files with 10 additions and 4 deletions
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14
shared/src/Radix2IntegerScanner.h
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@ -47,7 +47,9 @@ class Radix2IntegerScanner< UInt, false >
Radix2IntegerScanner()
: msb(~UInt(0) &~ (~UInt(0) >> 1)) { }
explicit Radix2IntegerScanner(int bits) : msb(1u << (bits - 1)) { }
explicit Radix2IntegerScanner(int bits)
: msb(UInt(1u) << (bits - 1))
{ }
typedef UInt state_type;
@ -65,9 +67,12 @@ class Radix2IntegerScanner< Int, true >
public:
Radix2IntegerScanner()
: msb(~state_type(0) &~ (~state_type(0) >> 1)) { }
: msb(~state_type(0u) &~ (~state_type(0u) >> 1))
{ }
explicit Radix2IntegerScanner(int bits) : msb(1u << (bits - 1)) { }
explicit Radix2IntegerScanner(int bits)
: msb(state_type(1u) << (bits - 1))
{ }
typedef typename type_traits::make_unsigned<Int>::type state_type;
@ -75,7 +80,8 @@ class Radix2IntegerScanner< Int, true >
state_type initial_state() const { return msb; }
bool advance(state_type& s) const { return (s >>= 1) != 0u; }
bool bit(Int const& v, state_type const& s) const { return !!((v-msb) & s); }
bool bit(Int const& v, state_type const& s) const
{ return !!((v-msb) & s); }
};
#endif /* defined(__hifi__Radix2IntegerScanner__) */