Re: [Patch V2 4/4] MdePkg: Fix Xcode 9 Beta treating 32-bit left shift as undefined

["Gao, Liming" <liming.gao@intel.com>]

Reviewed-by: Liming Gao <liming.gao@intel.com>

> -----Original Message-----
> From: Zhu, Yonghong
> Sent: Thursday, August 3, 2017 5:00 PM
> To: edk2-devel@lists.01.org
> Cc: Gao, Liming <liming.gao@intel.com>; Kinney, Michael D <michael.d.kinney@intel.com>; Andrew Fish <afish@apple.com>
> Subject: [Patch V2 4/4] MdePkg: Fix Xcode 9 Beta treating 32-bit left shift as undefined
> 
> Bug: https://bugzilla.tianocore.org/show_bug.cgi?id=635
> 
> Cc: Liming Gao <liming.gao@intel.com>
> Cc: Michael D Kinney <michael.d.kinney@intel.com>
> Contributed-under: TianoCore Contribution Agreement 1.0
> Signed-off-by: Andrew Fish <afish@apple.com>
> ---
>  MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.c
> b/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.c
> index e3b2846..e818543 100644
> --- a/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.c
> +++ b/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.c
> @@ -38,18 +38,18 @@ FillBuf (
>    )
>  {
>    //
>    // Left shift NumOfBits of bits in advance
>    //
> -  Sd->mBitBuf = (UINT32) (Sd->mBitBuf << NumOfBits);
> +  Sd->mBitBuf = (UINT32) LShiftU64 (((UINT64)Sd->mBitBuf), NumOfBits);
> 
>    //
>    // Copy data needed in bytes into mSbuBitBuf
>    //
>    while (NumOfBits > Sd->mBitCount) {
> -
> -    Sd->mBitBuf |= (UINT32) (Sd->mSubBitBuf << (NumOfBits = (UINT16) (NumOfBits - Sd->mBitCount)));
> +    NumOfBits = (UINT16) (NumOfBits - Sd->mBitCount);
> +    Sd->mBitBuf |= (UINT32) LShiftU64 (((UINT64)Sd->mSubBitBuf), NumOfBits);
> 
>      if (Sd->mCompSize > 0) {
>        //
>        // Get 1 byte into SubBitBuf
>        //
> --
> 2.6.1.windows.1