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(scan_loop): Treat pseudo duplicated for exit tests just 

like we treat user vars in seeing if we can move a SET.

From-SVN: r4514
This commit is contained in:
Richard Stallman 1993-05-20 04:34:02 +00:00
parent dca821e1a9
commit 6ad216adda
1 changed files with 5 additions and 2 deletions
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7
gcc/loop.c
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@ -682,13 +682,16 @@ scan_loop (loop_start, end, nregs)
;
/* In order to move a register, we need to have one of three cases:
(1) it is used only in the same basic block as the set
(2) it is not a user variable.
(2) it is not a user variable and it is not used in the
exit test (this can cause the variable to be used
before it is set just like a user-variable).
(3) the set is guaranteed to be executed once the loop starts,
and the reg is not used until after that. */
else if (! ((! maybe_never
&& ! loop_reg_used_before_p (set, p, loop_start,
scan_start, end))
|| ! REG_USERVAR_P (SET_DEST (PATTERN (p)))
|| (! REG_USERVAR_P (SET_DEST (PATTERN (p)))
&& ! REG_LOOP_TEST_P (SET_DEST (PATTERN (p))))
|| reg_in_basic_block_p (p, SET_DEST (PATTERN (p)))))
;
else if ((tem = invariant_p (src))