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Fix 92085-2.c ICE due to having (const_int 0) as the destination of a set.

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gcc/
	* lower-subreg.c (resolve_simple_move): If simplify_gen_subreg_concatn
	returns (const_int 0) for the destination, then emit nothing.
This commit is contained in:
Jeff Law 2020-06-01 17:14:50 -04:00
parent 172f2c42a1
commit c7969df1c5
1 changed files with 15 additions and 6 deletions
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21
gcc/lower-subreg.c
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@ -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)