diff options
author | Björn Gustavsson <[email protected]> | 2019-01-12 15:57:32 +0100 |
---|---|---|
committer | Björn Gustavsson <[email protected]> | 2019-01-16 13:06:00 +0100 |
commit | eb0b8da6e816afde020e3f229803045f8b2bdb89 (patch) | |
tree | 1b59ad3c0dc45ea34138495d1e0a98a5bc565ff2 /lib/observer | |
parent | c865abfcd396957e3c831a9f3dbe7922f63795be (diff) | |
download | otp-eb0b8da6e816afde020e3f229803045f8b2bdb89.tar.gz otp-eb0b8da6e816afde020e3f229803045f8b2bdb89.tar.bz2 otp-eb0b8da6e816afde020e3f229803045f8b2bdb89.zip |
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.
Diffstat (limited to 'lib/observer')
0 files changed, 0 insertions, 0 deletions