diff options
Diffstat (limited to 'gcc/emit-rtl.c')
| -rw-r--r-- | gcc/emit-rtl.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/gcc/emit-rtl.c b/gcc/emit-rtl.c index d58b895e751..2e48bde2983 100644 --- a/gcc/emit-rtl.c +++ b/gcc/emit-rtl.c @@ -2473,6 +2473,64 @@ add_insn_before (insn, before) PREV_INSN (XVECEXP (PATTERN (before), 0, 0)) = insn; } +/* Remove an insn from its doubly-linked list. This function knows how + to handle sequences. */ +void +remove_insn (insn) + rtx insn; +{ + rtx next = NEXT_INSN (insn); + rtx prev = PREV_INSN (insn); + if (prev) + { + NEXT_INSN (prev) = next; + if (GET_CODE (prev) == INSN && GET_CODE (PATTERN (prev)) == SEQUENCE) + { + rtx sequence = PATTERN (prev); + NEXT_INSN (XVECEXP (sequence, 0, XVECLEN (sequence, 0) - 1)) = next; + } + } + else if (first_insn == insn) + first_insn = next; + else + { + struct sequence_stack *stack = sequence_stack; + /* Scan all pending sequences too. */ + for (; stack; stack = stack->next) + if (insn == stack->first) + { + stack->first = next; + break; + } + + if (stack == 0) + abort (); + } + + if (next) + { + PREV_INSN (next) = prev; + if (GET_CODE (next) == INSN && GET_CODE (PATTERN (next)) == SEQUENCE) + PREV_INSN (XVECEXP (PATTERN (next), 0, 0)) = prev; + } + else if (last_insn == insn) + last_insn = prev; + else + { + struct sequence_stack *stack = sequence_stack; + /* Scan all pending sequences too. */ + for (; stack; stack = stack->next) + if (insn == stack->last) + { + stack->last = prev; + break; + } + + if (stack == 0) + abort (); + } +} + /* Delete all insns made since FROM. FROM becomes the new last instruction. */ |