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do not fold cnst+cnst in amd64's isel
This may cause invalid assembly to be generated and is not all that useful anyway after constant folding has run.
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@ -536,7 +536,6 @@ anumber(ANum *ai, Blk *b, Con *con)
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* 0 * 2 -> 3 s * i (when constant is 1,2,4,8)
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*/
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static char add[10][10] = {
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[2] [2] = 2, /* folding */
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[2] [4] = 4, [4] [2] = 4,
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[2] [6] = 6, [6] [2] = 6,
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[2] [7] = 7, [7] [2] = 7,
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