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(jump_optimize): Don't convert if (foo) x++ into an add of an scc

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unless X has no side effects and can't trap.

From-SVN: r7638
This commit is contained in:
Richard Kenner 1994-07-01 19:25:58 -04:00
parent a78bdb8ef8
commit 8743ede9fb
1 changed files with 2 additions and 0 deletions
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gcc/jump.c
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@ -1248,6 +1248,8 @@ jump_optimize (f, cross_jump, noop_moves, after_regscan)
&& (XEXP (SET_SRC (temp1), 1) == const1_rtx
|| XEXP (SET_SRC (temp1), 1) == constm1_rtx)
&& rtx_equal_p (temp2, XEXP (SET_SRC (temp1), 0))
&& ! side_effects_p (temp2)
&& ! may_trap_p (temp2)
/* INSN must either branch to the insn after TEMP or the insn
after TEMP must branch to the same place as INSN. */
&& (reallabelprev == temp