nerdcruft/libcruft-util
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Rename rotate_left to the more friendly rotatel

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This commit is contained in:
Danny Robson 2013-03-11 20:41:19 +11:00
parent 011ac70a9d
commit 990d5ab806
4 changed files with 30 additions and 3 deletions
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3
bitwise.hpp
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@ -35,7 +35,8 @@ const uint8_t BITMASK_8BITS = 0xFF;
template <typename T>
T rotate_left (const T &value, size_t magnitude) {
T
rotatel (const T &value, size_t magnitude) {
magnitude %= sizeof (T) * 8;
return (value << magnitude) | (value >> sizeof (value) * 8 - magnitude);
}

5
test/.gitignore vendored
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@ -1,13 +1,13 @@
/*.log
/*.trs
/adler*
/backtrace*
/bitwise
/checksum*
/float*
/hton*
/ip*
/json
/json-check*
/*.log
/maths*
/matrix*
/option
@ -15,4 +15,5 @@
/range*
/region*
/signal*
/*.trs
/version*

4
test/Makefile.am
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@ -9,6 +9,7 @@ AM_LDFLAGS = $(COMMON_LDFLAGS)
TEST_BIN = \
backtrace \
bitwise \
checksum \
float \
hton \
@ -31,6 +32,9 @@ backtrace_CPPFLAGS = $(COMMON_CXXFLAGS)
backtrace_LDADD = $(builddir)/../libutil.la
backtrace_SOURCES = backtrace.cpp
bitwise_LDADD = $(builddir)/../libutil.la
bitwise_SOURCES = bitwise.cpp
checksum_LDADD = $(builddir)/../libutil.la
checksum_SOURCES = checksum.cpp

21
test/bitwise.cpp Normal file
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@ -0,0 +1,21 @@
#include "../bitwise.hpp"
int
main (int, char**) {
CHECK_EQ (rotatel (uint8_t (0x0F), 0), 0x0F);
CHECK_EQ (rotatel (uint8_t (0x0F), 4), 0xF0);
CHECK_EQ (rotatel (uint8_t (0xF0), 4), 0x0F);
CHECK_EQ (rotatel (uint8_t (0x0F), 8), 0x0F);
CHECK_EQ (rotatel (uint16_t (0xABCD), 0), 0xABCD);
CHECK_EQ (rotatel (uint16_t (0xABCD), 4), 0xBCDA);
CHECK_EQ (rotatel (uint16_t (0xABCD), 8), 0xCDAB);
CHECK_EQ (rotatel (uint16_t (0xABCD), 12), 0xDABC);
CHECK_EQ (rotatel (uint16_t (0xABCD), 16), 0xABCD);
CHECK_EQ (rotatel (uint32_t (0x12345670), 12), 0x45670123);
CHECK_EQ (rotatel (uint64_t (0x1234567890ABCDEF), 12), 0x4567890ABCDEF123);
return 0;
}