diff options
author | Jeff Law <law@torsion.usersys.redhat.com> | 2020-06-01 17:14:50 -0400 |
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committer | Giuliano Belinassi <giuliano.belinassi@usp.br> | 2020-08-17 13:09:33 -0300 |
commit | 51b4d6e1d8b9906810c15a58fd0e4ba9b1300247 (patch) | |
tree | 339ab59fe725f19859e7bf8262fd7eabcd9d38b4 /gcc/lower-subreg.c | |
parent | 2e43488e851ec58167853ac399794dfef578312f (diff) |
Fix 92085-2.c ICE due to having (const_int 0) as the destination of a set.
gcc/
* lower-subreg.c (resolve_simple_move): If simplify_gen_subreg_concatn
returns (const_int 0) for the destination, then emit nothing.
Diffstat (limited to 'gcc/lower-subreg.c')
-rw-r--r-- | gcc/lower-subreg.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/gcc/lower-subreg.c b/gcc/lower-subreg.c index a11e535b5bf..abe7180c686 100644 --- a/gcc/lower-subreg.c +++ b/gcc/lower-subreg.c @@ -1087,12 +1087,21 @@ resolve_simple_move (rtx set, rtx_insn *insn) emit_clobber (dest); for (i = 0; i < words; ++i) - emit_move_insn (simplify_gen_subreg_concatn (word_mode, dest, - dest_mode, - i * UNITS_PER_WORD), - simplify_gen_subreg_concatn (word_mode, src, - orig_mode, - i * UNITS_PER_WORD)); + { + rtx t = simplify_gen_subreg_concatn (word_mode, dest, + dest_mode, + i * UNITS_PER_WORD); + /* simplify_gen_subreg_concatn can return (const_int 0) for + some sub-objects of paradoxical subregs. As a source operand, + that's fine. As a destination it must be avoided. Those are + supposed to be don't care bits, so we can just drop that store + on the floor. */ + if (t != CONST0_RTX (word_mode)) + emit_move_insn (t, + simplify_gen_subreg_concatn (word_mode, src, + orig_mode, + i * UNITS_PER_WORD)); + } } if (real_dest != NULL_RTX) |