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auto-inc-dec.c: Fix pass description, remove apparent accidental duplication.

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* auto-inc-dec.c: Fix pass description, remove apparent
	accidental duplication.

From-SVN: r147541
This commit is contained in:
Steven Bosscher 2009-05-14 20:12:09 +00:00
parent 240f9e9491
commit 1154c4fafe
2 changed files with 18 additions and 51 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2009-05-14 Steven Bosscher <steven@gcc.gnu.org>
* auto-inc-dec.c: Fix pass description, remove apparent
accidental duplication.
2009-05-14 H.J. Lu <hongjiu.lu@intel.com>
PR middle-end/40147

64
gcc/auto-inc-dec.c
View File

@ -46,6 +46,7 @@ along with GCC; see the file COPYING3. If not see
There are (4) basic forms that are matched:
(1) FORM_PRE_ADD
a <- b + c
...
*a
@ -55,6 +56,9 @@ along with GCC; see the file COPYING3. If not see
a <- b
...
*(a += c) pre
(2) FORM_PRE_INC
a += c
...
*a
@ -62,18 +66,24 @@ along with GCC; see the file COPYING3. If not see
becomes
*(a += c) pre
(3) FORM_POST_ADD
*a
...
b <- a + c
for this case to be true, b must not be assigned or used between
the *a and the assignment to b. B must also be a Pmode reg.
(For this case to be true, b must not be assigned or used between
the *a and the assignment to b. B must also be a Pmode reg.)
becomes
b <- a
...
*(b += c) post
(4) FORM_POST_INC
*a
...
a <- a + c
@ -99,56 +109,8 @@ along with GCC; see the file COPYING3. If not see
The is one special case: if a already had an offset equal to it +-
its width and that offset is equal to -c when the increment was
before the ref or +c if the increment was after the ref, then if we
can do the combination but switch the pre/post bit.
can do the combination but switch the pre/post bit. */
(1) FORM_PRE_ADD
a <- b + c
...
*(a - c)
becomes
a <- b
...
*(a += c) post
(2) FORM_PRE_INC
a += c
...
*(a - c)
becomes
*(a += c) post
(3) FORM_POST_ADD
*(a + c)
...
b <- a + c
for this case to be true, b must not be assigned or used between
the *a and the assignment to b. B must also be a Pmode reg.
becomes
b <- a
...
*(b += c) pre
(4) FORM_POST_INC
*(a + c)
...
a <- a + c
becomes
*(a += c) pre
*/
#ifdef AUTO_INC_DEC
enum form