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(jump_optimize): Ensure operand of REG_NOTES is an INSN; otherwise, we

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might try to read outside allocated memory.

From-SVN: r2684
This commit is contained in:
Richard Kenner 1992-11-03 14:57:52 -05:00
parent b76e0b7680
commit a8fc41afdd
1 changed files with 5 additions and 0 deletions
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5
gcc/jump.c
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@ -837,6 +837,7 @@ jump_optimize (f, cross_jump, noop_moves, after_regscan)
&& this_is_condjump && ! this_is_simplejump
&& BRANCH_COST >= 3
&& (temp = next_nonnote_insn (insn)) != 0
&& GET_CODE (temp) == INSN
&& REG_NOTES (temp) == 0
&& (reallabelprev == temp
|| ((temp2 = next_active_insn (temp)) != 0
@ -874,8 +875,10 @@ jump_optimize (f, cross_jump, noop_moves, after_regscan)
&& this_is_condjump && ! this_is_simplejump
&& BRANCH_COST >= 4
&& (temp = next_nonnote_insn (insn)) != 0
&& GET_CODE (temp) == INSN
&& REG_NOTES (temp) == 0
&& (temp3 = next_nonnote_insn (temp)) != 0
&& GET_CODE (temp3) == INSN
&& REG_NOTES (temp3) == 0
&& (reallabelprev == temp3
|| ((temp2 = next_active_insn (temp3)) != 0
@ -920,8 +923,10 @@ jump_optimize (f, cross_jump, noop_moves, after_regscan)
&& this_is_condjump && ! this_is_simplejump
&& BRANCH_COST >= 4
&& (temp = next_nonnote_insn (insn)) != 0
&& GET_CODE (temp) == INSN
&& REG_NOTES (temp) == 0
&& (temp3 = next_nonnote_insn (temp)) != 0
&& GET_CODE (temp3) == INSN
&& REG_NOTES (temp3) == 0
&& (reallabelprev == temp3
|| ((temp2 = next_active_insn (temp3)) != 0