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* loop.c (basic_induction_var): Avoid double recording of an increment.

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From-SVN: r34153
This commit is contained in:
J"orn Rennecke 2000-05-25 01:30:51 +00:00 committed by Joern Rennecke
parent 73bb94549e
commit af19809749
2 changed files with 11 additions and 1 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
Thu May 25 02:27:22 2000 J"orn Rennecke <amylaar@cygnus.co.uk>
* loop.c (basic_induction_var): Avoid double recording of an increment.
Thu May 25 02:19:27 2000 J"orn Rennecke <amylaar@cygnus.co.uk>
* Back out this patch:

8
gcc/loop.c
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@ -5995,6 +5995,11 @@ basic_induction_var (loop, x, mode, dest_reg, p, inc_val, mult_val, location)
/* If this register is assigned in a previous insn, look at its
source, but don't go outside the loop or past a label. */
/* If this sets a register to itself, we would repeat any previous
biv increment if we applied this strategy blindly. */
if (rtx_equal_p (dest_reg, x))
return 0;
insn = p;
while (1)
{
@ -6066,7 +6071,8 @@ basic_induction_var (loop, x, mode, dest_reg, p, inc_val, mult_val, location)
if (insn)
set = single_set (insn);
if (set && SET_DEST (set) == XEXP (x, 0)
if (! rtx_equal_p (dest_reg, XEXP (x, 0))
&& set && SET_DEST (set) == XEXP (x, 0)
&& GET_CODE (XEXP (x, 1)) == CONST_INT
&& INTVAL (XEXP (x, 1)) >= 0
&& GET_CODE (SET_SRC (set)) == ASHIFT