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| author | Björn Gustavsson <[email protected]> | 2019-03-03 08:13:47 +0100 |
|---|---|---|
| committer | Björn Gustavsson <[email protected]> | 2019-03-06 15:42:42 +0100 |
| commit | 90bf10302a792865cdb0f741e23ca130725e7461 (patch) | |
| tree | 429cacdddd9b8055a44e1a64d6b108b82b7f1f82 /erts/emulator/beam | |
| parent | ca68fe8277c5f534d32c8d5bf0e5ba66ebf124e0 (diff) | |
| download | otp-90bf10302a792865cdb0f741e23ca130725e7461.tar.gz otp-90bf10302a792865cdb0f741e23ca130725e7461.tar.bz2 otp-90bf10302a792865cdb0f741e23ca130725e7461.zip | |
Remove optimization that has become a pessimization
The compiler used to generate "move Literal y(Y)" instructions very
rarely. Therefore, there was a transformation to avoid having a "move
c y" instruction.
With the new compiler, "move Literal y(Y)" instructions are relatively frequent, so we will need a "move c y" instruction.
Diffstat (limited to 'erts/emulator/beam')
| -rw-r--r-- | erts/emulator/beam/ops.tab | 14 |
1 files changed, 4 insertions, 10 deletions
diff --git a/erts/emulator/beam/ops.tab b/erts/emulator/beam/ops.tab index 448412c903..81f598d266 100644 --- a/erts/emulator/beam/ops.tab +++ b/erts/emulator/beam/ops.tab @@ -392,20 +392,14 @@ move3 x x x x x x move C=aiq X=x==1 => move_x1 C move C=aiq X=x==2 => move_x2 C +move n D=y => init D + move_x1 c move_x2 c -# The compiler almost never generates a "move Literal y(Y)" instruction, -# so let's cheat if we encounter one. -move S=n D=y => init D -move S=c D=y => move S x | move x D - -move x x -move x y -move y x -move c x +move xy xy +move c xy move n x -move y y # The following move instructions using x(0) are frequently used. |