diff options
Diffstat (limited to 'lib/compiler/src')
| -rw-r--r-- | lib/compiler/src/beam_bsm.erl | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/lib/compiler/src/beam_bsm.erl b/lib/compiler/src/beam_bsm.erl index 1c8e0e9854..abc6e96c85 100644 --- a/lib/compiler/src/beam_bsm.erl +++ b/lib/compiler/src/beam_bsm.erl @@ -310,7 +310,18 @@ btb_reaches_match_2([{test,bs_start_match2,{f,F},Live,[Bin,_],Ctx}|Is], end; btb_reaches_match_2([{test,_,{f,F},Ss}=I|Is], Regs, D0) -> btb_ensure_not_used(Ss, I, Regs), - D = btb_follow_branch(F, Regs, D0), + D1 = btb_follow_branch(F, Regs, D0), + D = case Is of + [{bs_context_to_binary,_}|_] -> + %% bs_context_to_binary following a test instruction + %% probably needs the current position to be saved as + %% the new start position, but we can't be sure. + %% Therefore, conservatively disable the optimization + %% (instead of forcing a saving of the position). + D1#btb{must_save=true,must_not_save=true}; + _ -> + D1 + end, btb_reaches_match_1(Is, Regs, D); btb_reaches_match_2([{test,_,{f,F},_,Ss,_}=I|Is], Regs, D0) -> btb_ensure_not_used(Ss, I, Regs), |