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For multiplications of 64-bit values (giving 64-bit result), detect cases where the arguments are sign-extended 32-bit values, on a per- operand basis. This will allow few patterns to match a wider variety of combinations in which extensions can occur. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@304223 91177308-0d34-0410-b5e6-96231b3b80d8
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