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authorBjörn Gustavsson <[email protected]>2019-01-12 15:57:32 +0100
committerBjörn Gustavsson <[email protected]>2019-01-16 13:06:00 +0100
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parentc865abfcd396957e3c831a9f3dbe7922f63795be (diff)
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Refactor string operands
There are two instructions that take string operands: {bs_put_string,Fail,NumberOfBytes,{string,String}} {bs_match_string,Fail,Register,NumberOfBits,{string,String}} In the canonical BEAM code that is passed to beam_asm, string String is currently represented as a list. (The string in bs_match_string is a bitstring before the beam_z compiler pass.) That is wasteful, because there will be unnecessary conversions between lists and binaries. Change the representation of String to be a binary. Furthermore, bs_put_string is an optimization of a bs_put_binary instruction with a literal binary operand. Currently, the bs_put_string instruction is introduced in beam_bs. Delay the introduction of bs_put_string to the beam_z pass. That will simplify optimizations and allow us to do the optimization currently done in beam_bs in a SSA pass in a future commit.
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