diff options
Diffstat (limited to 'gcc/flow.c')
| -rw-r--r-- | gcc/flow.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/gcc/flow.c b/gcc/flow.c index bf8e61ce3f6..344b48bf223 100644 --- a/gcc/flow.c +++ b/gcc/flow.c @@ -1865,19 +1865,22 @@ init_propagate_block_info (basic_block bb, regset live, regset local_set, rtx set_src = SET_SRC (pc_set (BB_END (bb))); rtx cond_true = XEXP (set_src, 0); rtx reg = XEXP (cond_true, 0); + enum rtx_code inv_cond; if (GET_CODE (reg) == SUBREG) reg = SUBREG_REG (reg); /* We can only track conditional lifetimes if the condition is - in the form of a comparison of a register against zero. - If the condition is more complex than that, then it is safe - not to record any information. */ - if (REG_P (reg) + in the form of a reversible comparison of a register against + zero. If the condition is more complex than that, then it is + safe not to record any information. */ + inv_cond = reversed_comparison_code (cond_true, BB_END (bb)); + if (inv_cond != UNKNOWN + && REG_P (reg) && XEXP (cond_true, 1) == const0_rtx) { rtx cond_false - = gen_rtx_fmt_ee (reverse_condition (GET_CODE (cond_true)), + = gen_rtx_fmt_ee (inv_cond, GET_MODE (cond_true), XEXP (cond_true, 0), XEXP (cond_true, 1)); if (GET_CODE (XEXP (set_src, 1)) == PC) |