diff options
Diffstat (limited to 'gcc/loop.c')
| -rw-r--r-- | gcc/loop.c | 19 |
1 files changed, 14 insertions, 5 deletions
@@ -4682,10 +4682,21 @@ strength_reduce (scan_start, end, loop_top, insn_count, { int auto_inc_opt = 0; - v->new_reg = gen_reg_rtx (v->mode); + /* If the code for derived givs immediately below has already + allocated a new_reg, we must keep it. */ + if (! v->new_reg) + v->new_reg = gen_reg_rtx (v->mode); if (v->derived_from) { + struct induction *d = v->derived_from; + + /* In case d->dest_reg is not replaceable, we have + to replace it in v->insn now. */ + if (! d->new_reg) + d->new_reg = gen_reg_rtx (d->mode); + PATTERN (v->insn) + = replace_rtx (PATTERN (v->insn), d->dest_reg, d->new_reg); PATTERN (v->insn) = replace_rtx (PATTERN (v->insn), v->dest_reg, v->new_reg); if (bl->biv_count != 1) @@ -7359,11 +7370,9 @@ recombine_givs (bl, loop_start, loop_end, unroll_p) && GET_CODE (XEXP (sum, 1)) == CONST_INT) || ! unroll_p) && validate_change (v->insn, &PATTERN (v->insn), - gen_rtx_SET (GET_MODE (v->dest_reg), - v->dest_reg, sum), 0)) + gen_rtx_SET (VOIDmode, v->dest_reg, sum), 0)) { v->derived_from = last_giv; - v->new_reg = v->dest_reg; life_end = stats[i].end_luid; if (loop_dump_stream) @@ -7371,7 +7380,7 @@ recombine_givs (bl, loop_start, loop_end, unroll_p) fprintf (loop_dump_stream, "giv at %d derived from %d as ", INSN_UID (v->insn), INSN_UID (last_giv->insn)); - print_rtl (loop_dump_stream, v->new_reg); + print_rtl (loop_dump_stream, sum); putc ('\n', loop_dump_stream); } } |