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2010 Mar 30
1
[LLVMdev] Question on SelectionDAGBuilder
...f we can convert the shuffle to an EXTRACT_SUBVECTOR. After computing min/max values of the mask for each operand, there's a look that looks at the ranges and determines whether an EXTRACT_SUBVECTOR can be used: for (int Input=0; Input < 2; ++Input) { if (MinRange[Input] == (int)(SrcNumElts+1) && MaxRange[Input] == -1) { RangeUse[Input] = 0; // Unused StartIdx[Input] = 0; } else if (MaxRange[Input] - MinRange[Input] < (int)MaskNumElts) { // Fits within range but we should see if we can find a good // start index that is a multiple of t...