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| author | Magnus Lång <[email protected]> | 2016-11-09 18:47:12 +0100 |
|---|---|---|
| committer | Magnus Lång <[email protected]> | 2016-11-15 14:58:59 +0100 |
| commit | c91c523f1ca58644267402325b6fb59d65049829 (patch) | |
| tree | c355fdf2a07ff894cbb8f1cc1bea7abcb889dd0b /lib/hipe/icode | |
| parent | ca0fbe891d0f8278b4824d6b2c5db4cd01fcef5c (diff) | |
| download | otp-c91c523f1ca58644267402325b6fb59d65049829.tar.gz otp-c91c523f1ca58644267402325b6fb59d65049829.tar.bz2 otp-c91c523f1ca58644267402325b6fb59d65049829.zip | |
hipe_rtl: drop alub dest when unused
Diffstat (limited to 'lib/hipe/icode')
| -rw-r--r-- | lib/hipe/icode/hipe_icode.erl | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/lib/hipe/icode/hipe_icode.erl b/lib/hipe/icode/hipe_icode.erl index 78508dff22..dce2fcb392 100644 --- a/lib/hipe/icode/hipe_icode.erl +++ b/lib/hipe/icode/hipe_icode.erl @@ -594,6 +594,7 @@ uses/1, defines/1, is_safe/1, + reduce_unused/1, strip_comments/1, subst/2, subst_uses/2, @@ -1765,6 +1766,18 @@ is_safe(Instr) -> #icode_end_try{} -> false end. +%% @doc Produces a simplified instruction sequence that is equivalent to [Instr] +%% under the assumption that all results of Instr are unused, or 'false' if +%% there is no such sequence (other than [Instr] itself). + +-spec reduce_unused(icode_instr()) -> false | [icode_instr()]. + +reduce_unused(Instr) -> + case is_safe(Instr) of + true -> []; + false -> false + end. + %%----------------------------------------------------------------------- -spec highest_var(icode_instrs()) -> non_neg_integer(). |