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authorBjörn Gustavsson <bjorn@erlang.org>2010-04-19 07:29:54 +0200
committerBjörn Gustavsson <bjorn@erlang.org>2010-04-19 07:39:38 +0200
commite965d90b5fe84fcb519ab8a8d41f7c0acb4c4c68 (patch)
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parentf39289291f9fcbb7b813584edb7d465e480be212 (diff)
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beam_type: Improve coalescing of fmove/2 and move/2 instructions
The following instruction sequence: fmove {fr,Fr} {x,TempXreg} move {x,TempXreg} {y,Dest} is rewritten to: fmove {fr,Fr} {y,Dest} (Provided that {x,TempXreg} is killed by the instructions following the sequence.) Generalize the optimization to also handle: fmove {fr,Fr} {x,TempXreg} move {x,TempXreg} {_,Dest} That is, the destination register can be either an X or Y register.
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