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A half-shuffle operation takes a word with zeros in the high half: 0000 0000 0000 0000 ABCD EFGH IJKL MNOP and spreads the bits out so they are in every other bit of the word: 0A0B 0C0D 0E0F 0G0H 0I0J 0K0L 0M0N 0O0P A half-unshuffle performs the reverse operation. Provide functions in bitops.h which implement these operations for 32-bit and 64-bit inputs, and add tests for them. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Shannon Zhao <shannon.zhao@linaro.org> Tested-by: Shannon Zhao <shannon.zhao@linaro.org> Message-id: 1465915112-29272-3-git-send-email-peter.maydell@linaro.org |
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