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| author | Björn Gustavsson <[email protected]> | 2019-01-16 19:06:19 +0100 |
|---|---|---|
| committer | Björn Gustavsson <[email protected]> | 2019-01-17 13:40:02 +0100 |
| commit | 9c852215c79ed6ec42c223463d4b5a0c221b4bf0 (patch) | |
| tree | d597366a655184d3958661b7206b5a6d6ff54199 /lib/compiler/src/beam_ssa_opt.erl | |
| parent | 9627785145f4db991ce0206d2fdc053557720c61 (diff) | |
| download | otp-9c852215c79ed6ec42c223463d4b5a0c221b4bf0.tar.gz otp-9c852215c79ed6ec42c223463d4b5a0c221b4bf0.tar.bz2 otp-9c852215c79ed6ec42c223463d4b5a0c221b4bf0.zip | |
beam_ssa_type: Eliminate redundant 'succeeded' instructions
The beam_ssa_type pass would leave redundant 'succeeded' instructions,
and depend on the live optimization pass to remove them.
Update beam_ssa_type to remove redundant 'succeeded' instructions.
This will not improve the generated code, but will improve compilation
times since it eliminates instructions and variables.
Diffstat (limited to 'lib/compiler/src/beam_ssa_opt.erl')
| -rw-r--r-- | lib/compiler/src/beam_ssa_opt.erl | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/lib/compiler/src/beam_ssa_opt.erl b/lib/compiler/src/beam_ssa_opt.erl index 6bba47b4ac..e23e62b5ad 100644 --- a/lib/compiler/src/beam_ssa_opt.erl +++ b/lib/compiler/src/beam_ssa_opt.erl @@ -856,14 +856,9 @@ live_opt_is([#b_set{op=succeeded,dst=SuccDst=SuccDstVar, #b_set{dst=Dst}=I|Is], Live0, Acc) -> case gb_sets:is_member(Dst, Live0) of true -> - case gb_sets:is_member(SuccDst, Live0) of - true -> - Live1 = gb_sets:add(Dst, Live0), - Live = gb_sets:delete_any(SuccDst, Live1), - live_opt_is([I|Is], Live, [SuccI|Acc]); - false -> - live_opt_is([I|Is], Live0, Acc) - end; + Live1 = gb_sets:add(Dst, Live0), + Live = gb_sets:delete_any(SuccDst, Live1), + live_opt_is([I|Is], Live, [SuccI|Acc]); false -> case live_opt_unused(I) of {replace,NewI0} -> |