diff options
Diffstat (limited to 'gcc/config/vax/vax.c')
| -rw-r--r-- | gcc/config/vax/vax.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/gcc/config/vax/vax.c b/gcc/config/vax/vax.c index 57408a5..2274cce 100644 --- a/gcc/config/vax/vax.c +++ b/gcc/config/vax/vax.c @@ -2066,6 +2066,19 @@ vax_expand_addsub_di_operands (rtx * operands, enum rtx_code code) else operands[2] = fixup_mathdi_operand (operands[2], DImode); + /* If we are adding or subtracting 0, then this is a move. */ + if (code == PLUS && operands[1] == const0_rtx) + { + temp = operands[2]; + operands[2] = operands[1]; + operands[1] = temp; + } + if (operands[2] == const0_rtx) + { + emit_move_insn (operands[0], operands[1]); + return; + } + /* If we are subtracting not from ourselves [d = a - b], and because the carry ops are two operand only, we would need to do a move prior to the subtract. And if d == b, we would need a temp otherwise |