diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/compiler/src/beam_bsm.erl | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/lib/compiler/src/beam_bsm.erl b/lib/compiler/src/beam_bsm.erl index e5429a9a9f..37053e1cc4 100644 --- a/lib/compiler/src/beam_bsm.erl +++ b/lib/compiler/src/beam_bsm.erl @@ -336,13 +336,16 @@ btb_call(Arity, Lbl, Regs0, Is, D0) -> %% First handle the call as if it were a tail call. D = btb_tail_call(Lbl, Regs, D0), - %% No problem so far, but now we must make sure that - %% we don't have any copies of the match context - %% tucked away in an y register. + %% No problem so far (the called function can handle a + %% match context). Now we must make sure that the rest + %% of this function following the call does not attempt + %% to use the match context in case there is a copy + %% tucked away in a y register. RegList = btb_context_regs(Regs), - case [R || {y,_}=R <- RegList] of - [] -> D; - [_|_] -> btb_error({multiple_uses,RegList}) + YRegs = [R || {y,_}=R <- RegList], + case btb_are_all_killed(YRegs, Is, D) of + true -> D; + false -> btb_error({multiple_uses,RegList}) end; true -> %% No match context in any x register. It could have been |