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590216cceb
Branches: main
compiler/loop_inv.m:
Fix a bug. An `unused' variable in an invariant call was treated
like an output variable and added to the invariant variables list,
and hoisted.
tests/hard_coded/Mercury.options:
tests/hard_coded/loop_inv_test3.exp:
tests/hard_coded/loop_inv_test3.m:
Add test case.
51 lines
1.2 KiB
Mathematica
51 lines
1.2 KiB
Mathematica
%-----------------------------------------------------------------------------%
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% Regression test. Loop invariant hoisting incorrectly treated `unused'
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% arguments in calls like outputs.
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:- module loop_inv_test3.
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:- interface.
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:- import_module io.
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:- pred main(io::di, io::uo) is det.
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%-----------------------------------------------------------------------------%
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%-----------------------------------------------------------------------------%
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:- implementation.
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:- import_module int.
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:- import_module list.
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%-----------------------------------------------------------------------------%
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main(!IO) :-
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loop(10, 10, [], L),
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io.write(L, !IO),
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io.nl(!IO).
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:- pred loop(int::in, int::in, list(int)::in, list(int)::out) is det.
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loop(Factor, N, L0, L) :-
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Value = foo(Factor, N1),
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bar(N, N1),
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( N1 = 0 ->
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L = L0
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;
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L1 = [Factor * Value | L0],
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loop(Factor, N - 1, L1, L)
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).
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:- func foo(int::in, int::unused) = (int::out) is det.
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:- pragma no_inline(foo/2).
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foo(F, _) = F.
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:- pred bar(int::in, int::out) is det.
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:- pragma no_inline(bar/2).
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bar(N, N).
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%-----------------------------------------------------------------------------%
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% vim: ft=mercury ts=8 sts=4 sw=4 et
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