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05e61f7113
When we multiply two 64-bit vectors, we extract lower and upper part and use the PMULUDQ instruction. When one of the operands is a constant, the upper part may be zero, we know this at compile time. Example: %a = mul <4 x i64> %b, <4 x i64> < i64 5, i64 5, i64 5, i64 5>. I'm checking the value of the upper part and prevent redundant "multiply", "shift" and "add" operations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239802 91177308-0d34-0410-b5e6-96231b3b80d8
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