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| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/optabs.c | 11 |
2 files changed, 16 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 602c7b8..0757c89 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,10 @@ 2016-07-21 James Greenhalgh <james.greenhalgh@arm.com> + * optabs.c (emit_condiitonal_move): Short circuit for identical + sources. + +2016-07-21 James Greenhalgh <james.greenhalgh@arm.com> + * ifcvt.c (noce_if_info): New fields: speed_p, original_cost, max_seq_cost. Removed fields: then_cost, else_cost, branch_cost. (noce_conversion_profitable_p): New. diff --git a/gcc/optabs.c b/gcc/optabs.c index 51e10e2..87b4f97 100644 --- a/gcc/optabs.c +++ b/gcc/optabs.c @@ -4214,6 +4214,17 @@ emit_conditional_move (rtx target, enum rtx_code code, rtx op0, rtx op1, enum insn_code icode; enum rtx_code reversed; + /* If the two source operands are identical, that's just a move. */ + + if (rtx_equal_p (op2, op3)) + { + if (!target) + target = gen_reg_rtx (mode); + + emit_move_insn (target, op3); + return target; + } + /* If one operand is constant, make it the second one. Only do this if the other operand is not constant as well. */ |