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authorJose Ricardo Ziviani <joserz@linux.vnet.ibm.com>2017-01-10 00:10:09 -0200
committerDavid Gibson <david@gibson.dropbear.id.au>2017-01-31 10:10:14 +1100
commitf539fbe33753fb1549e28c56225d0ab7a8cb0669 (patch)
tree2944e5725ea7a9f77c4c5811961ecb1d2f610a4c /target
parent6758c192b063515b5c7bd2b0086217825c5b6d00 (diff)
host-utils: Implement unsigned quadword left/right shift and unit tests
Implements 128-bit left shift and right shift as well as their testcases. By design, shift silently mods by 128, so the caller is responsible to assert the shift range if necessary. Left shift sets the overflow flag if any non-zero digit is shifted out. Examples: ulshift(&low, &high, 250, &overflow); equivalent: n << 122 urshift(&low, &high, -2); equivalent: n << 126 Signed-off-by: Jose Ricardo Ziviani <joserz@linux.vnet.ibm.com> Reviewed-by: Eric Blake <eblake@redhat.com> [dwg: Added test-shift128 to .gitignore] Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
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