[llvm-commits] [PATCH] ARM: Allow long extensions to combine into vmull

[Pete Couperus]

Hello,

The ARM backend currently crashes when trying to combine:
        %tmp1 = load <4 x i8>* %A
        %tmp2 = load <4 x i8>* %B
        %tmp3 = sext <4 x i8> %tmp1 to <4 x i32>
        %tmp4 = sext <4 x i8> %tmp2 to <4 x i32>
        %tmp5 = mul <4 x i32> %tmp3, %tmp4

into a vmull.  This was reported as PR 12281.
This patch fixes this problem.
Please review!
Thanks,

Pete
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