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(move_movables): Delete REG_EQUAL notes that describe a 

non loop invariant value.

From-SVN: r4653
This commit is contained in:
Jim Wilson 1993-06-08 14:57:08 -07:00
parent 68f68b9042
commit e6726b1f48
1 changed files with 10 additions and 0 deletions
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10
gcc/loop.c
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@ -1824,6 +1824,16 @@ move_movables (movables, threshold, insn_count, loop_start, end, nregs)
REG_NOTES (i1) = REG_NOTES (p);
/* If there is a REG_EQUAL note present whose value is
not loop invariant, then delete it, since it may
cause problems with later optimization passes.
It is possible for cse to create such notes
like this as a result of record_jump_cond. */
if ((temp = find_reg_note (i1, REG_EQUAL, NULL_RTX))
&& ! invariant_p (XEXP (temp, 0)))
remove_note (i1, temp);
if (new_start == 0)
new_start = i1;