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HV:treewide:Update return type for function fls64 and clz64

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Change the return type of function fls64 and clz64 as uint16_t;
When the input is zero, INVALID_ID_INDEX is returned;
Update temporary variable type and return value check of caller
when it call fls64 or clz64;
When input value is zero, clz64 returns 64 directly.

V1-->V2:
        INVALID_BIT_INDEX instead of INVALID_NUMBER;
        Partly revert apicv_pending_intr udpates;
        Add type conversion as needed;
        Coding style fixing.
V2-->V3:
        Correct type conversion;
        fls64 return INVALID_BIT_INDEX directly when
        the input value is zero.
V3-->V4:
        No updates for this part in PATCH V4.

Note: For instruction "bsrq", destination register value
      is undefined when source register value is zero.

Signed-off-by: Xiangyang Wu <xiangyang.wu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Xiangyang Wu
2018-07-02 13:58:03 +08:00
committed by lijinxia
parent 13d354e7a6
commit db01efa047
3 changed files with 20 additions and 16 deletions
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2
hypervisor/lib/div.c
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@@ -94,7 +94,7 @@ int udiv64(uint64_t dividend, uint64_t divisor, struct udiv_result *res)
*/
/* align divisor and dividend. */
bits = clz64(divisor) - clz64(dividend);
bits = (uint64_t)(clz64(divisor) - clz64(dividend));
divisor <<= bits;
mask = 1UL << bits;
/* division loop */