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authorBjörn Gustavsson <[email protected]>2010-11-19 16:46:58 +0100
committerBjörn Gustavsson <[email protected]>2011-01-17 15:23:43 +0100
commit55eef00e9e0331bddd277194509c6094e8306211 (patch)
tree32ce2794284c3a15fa0a3b2a9dc8e6514a64fa86 /erts/etc
parenta24830ce9db4325b51af56262094bb1d32ef4e2b (diff)
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Eliminate use of GetArg1() in the select_val instruction
Instead of having one i_select_val_sfI instruction that uses the GetArg1() macro to fetch the controlling expression, use three separate instructions for each of the register types. That will save one word when selecting on the {x,0} register. It should also be slightly faster since a conditional branch is eliminated. Although it seems that the BEAM compiler will never generate a constant controlling expression (even with optimizations turned off), we still make sure that they will work by evaluating the select_val instruction at load time. Handle the select_tuple_arity instruction in the same way.
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