diff options
Diffstat (limited to 'gcc/loop-unroll.c')
| -rw-r--r-- | gcc/loop-unroll.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/gcc/loop-unroll.c b/gcc/loop-unroll.c index 4561ce8..f952d9d 100644 --- a/gcc/loop-unroll.c +++ b/gcc/loop-unroll.c @@ -1060,6 +1060,59 @@ split_edge_and_insert (edge e, rtx insns) return bb; } +/* Prepare a sequence comparing OP0 with OP1 using COMP and jumping to LABEL if + true, with probability PROB. If CINSN is not NULL, it is the insn to copy + in order to create a jump. */ + +static rtx +compare_and_jump_seq (rtx op0, rtx op1, enum rtx_code comp, rtx label, int prob, + rtx cinsn) +{ + rtx seq, jump, cond; + enum machine_mode mode; + + mode = GET_MODE (op0); + if (mode == VOIDmode) + mode = GET_MODE (op1); + + start_sequence (); + if (GET_MODE_CLASS (mode) == MODE_CC) + { + /* A hack -- there seems to be no easy generic way how to make a + conditional jump from a ccmode comparison. */ + gcc_assert (cinsn); + cond = XEXP (SET_SRC (pc_set (cinsn)), 0); + gcc_assert (GET_CODE (cond) == comp); + gcc_assert (rtx_equal_p (op0, XEXP (cond, 0))); + gcc_assert (rtx_equal_p (op1, XEXP (cond, 1))); + emit_jump_insn (copy_insn (PATTERN (cinsn))); + jump = get_last_insn (); + gcc_assert (JUMP_P (jump)); + JUMP_LABEL (jump) = JUMP_LABEL (cinsn); + LABEL_NUSES (JUMP_LABEL (jump))++; + redirect_jump (jump, label, 0); + } + else + { + gcc_assert (!cinsn); + + op0 = force_operand (op0, NULL_RTX); + op1 = force_operand (op1, NULL_RTX); + do_compare_rtx_and_jump (op0, op1, comp, 0, + mode, NULL_RTX, NULL_RTX, label, -1); + jump = get_last_insn (); + gcc_assert (JUMP_P (jump)); + JUMP_LABEL (jump) = label; + LABEL_NUSES (label)++; + } + add_int_reg_note (jump, REG_BR_PROB, prob); + + seq = get_insns (); + end_sequence (); + + return seq; +} + /* Unroll LOOP for which we are able to count number of iterations in runtime LOOP->LPT_DECISION.TIMES times. The transformation does this (with some extra care for case n < 0): |