public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug rtl-optimization/42617]  New: TARGET_MEM_REF and
@ 2010-01-04 22:59 matt at use dot net
  2010-01-04 23:25 ` [Bug rtl-optimization/42617] TARGET_MEM_REF and plain INDIRECT_REFs are not handled by the RTL oracle rguenth at gcc dot gnu dot org
                   ` (13 more replies)
  0 siblings, 14 replies; 15+ messages in thread
From: matt at use dot net @ 2010-01-04 22:59 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/ml/gcc/2009-12/msg00169.html

From: Jianzhang Peng <jianzhangpeng at gmail dot com>

I unroll the following code one times in a gimpile pass.

for(i=0; i< N ; i++)
  a[i] = b[i] + c[i];

And then I create the loops's ddg using build_intra_loop_deps ( ) in
an RTL pass;
I found the data dependence information:  insn 54 TRUE_DEPENDENCE insn 53.

insn 50  (set (reg:SF 243)  (mem/s:SF (reg:SI 236 [ ivtmp.46 ])     //
reg243 <-b[i]

insn 51 (set (reg:SF 244)   (mem/s:SF (reg:SI 235 [ ivtmp.49 ])     //
reg244 <-c[i]
insn 52 (set (reg:SF 245)
             (plus:SF (reg:SF 243)  (reg:SF 244)))
//reg245 <- reg243 + reg244

insn 53 (set (mem/s:SF (reg:SI 234 [ ivtmp.51 ])  (reg:SF 245))
//reg245->a[i]

insn 54 (set (reg:SF 246)
// reg246 <-b[i+1]
              (mem/s:SF (plus:SI (reg:SI 236 [ ivtmp.46 ])
                                  (const_int 4 [0x4]))

insn 55 (set (reg:SF 247)
             (mem/s:SF (plus:SI (reg:SI 235 [ ivtmp.49 ])
// reg247 <- c[i+ 1]
                        (const_int 4 [0x4]))

insn 56 (set (reg:SF 248)
//reg248 <- reg246 + reg247
              (plus:SF (reg:SF 246)
                       (reg:SF 247)))

insn 57 (set (mem/s:SF (plus:SI (reg:SI 234 [ ivtmp.51 ])
// reg248 -> a[i + 1]
                                 (const_int 4 [0x4])) [2 a S4 A32])
              (reg:SF 248))

...
===========================

(insn 50 49 51 3 loop.c:14 (set (reg:SF 243)
        (mem/s:SF (reg:SI 236 [ ivtmp.46 ]) [2 b S4 A32])) 320
{*movsf_hardfloat} (nil))

(insn 51 50 52 3 loop.c:14 (set (reg:SF 244)
        (mem/s:SF (reg:SI 235 [ ivtmp.49 ]) [2 c S4 A32])) 320
{*movsf_hardfloat} (nil))

(insn 52 51 53 3 loop.c:14 (set (reg:SF 245)
        (plus:SF (reg:SF 243)
            (reg:SF 244))) 7 {addsf3} (expr_list:REG_DEAD (reg:SF 244)
        (expr_list:REG_DEAD (reg:SF 243)
            (nil))))

(insn 53 52 54 3 loop.c:14 (set (mem/s:SF (reg:SI 234 [ ivtmp.51 ]) [2
a S4 A32])
        (reg:SF 245)) 320 {*movsf_hardfloat} (expr_list:REG_DEAD (reg:SF 245)
        (nil)))

(insn 54 53 55 3 loop.c:14 (set (reg:SF 246)
        (mem/s:SF (plus:SI (reg:SI 236 [ ivtmp.46 ])
                (const_int 4 [0x4])) [2 b S4 A32])) 320
{*movsf_hardfloat} (nil))

(insn 55 54 56 3 loop.c:14 (set (reg:SF 247)
        (mem/s:SF (plus:SI (reg:SI 235 [ ivtmp.49 ])
                (const_int 4 [0x4])) [2 c S4 A32])) 320
{*movsf_hardfloat} (nil))

(insn 56 55 57 3 loop.c:14 (set (reg:SF 248)
        (plus:SF (reg:SF 246)
            (reg:SF 247))) 7 {addsf3} (expr_list:REG_DEAD (reg:SF 247)
        (expr_list:REG_DEAD (reg:SF 246)
            (nil))))

(insn 57 56 58 3 loop.c:14 (set (mem/s:SF (plus:SI (reg:SI 234 [ ivtmp.51 ])
                (const_int 4 [0x4])) [2 a S4 A32])
        (reg:SF 248)) 320 {*movsf_hardfloat} (expr_list:REG_DEAD (reg:SF 248)
        (nil)))
(insn 58 57 61 3 loop.c:7 (set (reg/v:SI 241 [ i ])
        (plus:SI (reg/v:SI 241 [ i ])
            (const_int 2 [0x2]))) 10 {*addsi3} (nil))

(insn 61 58 62 3 loop.c:7 (set (reg:SI 240 [ ivtmp.29 ])
        (minus:SI (reg:SI 258)
            (reg/v:SI 241 [ i ]))) 23 {subsi3} (expr_list:REG_EQUAL
(minus:SI (const_int 10240 [0x2800])
            (reg/v:SI 241 [ i ]))
        (nil)))


(insn 62 61 63 3 loop.c:7 (set (reg:SI 236 [ ivtmp.46 ])
        (plus:SI (reg:SI 236 [ ivtmp.46 ])
            (const_int 8 [0x8]))) 10 {*addsi3} (nil))

(insn 63 62 64 3 loop.c:7 (set (reg:SI 235 [ ivtmp.49 ])
        (plus:SI (reg:SI 235 [ ivtmp.49 ])
            (const_int 8 [0x8]))) 10 {*addsi3} (nil))

(insn 64 63 67 3 loop.c:7 (set (reg:SI 234 [ ivtmp.51 ])
        (plus:SI (reg:SI 234 [ ivtmp.51 ])
            (const_int 8 [0x8]))) 10 {*addsi3} (nil))

(jump_insn 67 64 68 3 loop.c:7 (set (pc)
        (if_then_else (ne (reg/v:SI 241 [ i ])
                (reg:SI 259))
            (label_ref:SI 116)
            (pc))) 415 {*branch_equalitysi} (expr_list:REG_EQUAL
(if_then_else (ne (reg/v:SI 241 [ i ])
                (const_int 10238 [0x27fe]))
            (label_ref:SI 116)
            (pc))
        (expr_list:REG_BR_PROB (const_int 9800 [0x2648])
            (nil))))


-- 
           Summary: TARGET_MEM_REF and
                    plain INDIRECT_REFs are not handled by the RTL oracle
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: matt at use dot net


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42617


^ permalink raw reply	[flat|nested] 15+ messages in thread
end of thread, other threads:[~2010-04-07 12:15 UTC | newest]

Thread overview: 15+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2010-01-04 22:59 [Bug rtl-optimization/42617] New: TARGET_MEM_REF and matt at use dot net
2010-01-04 23:25 ` [Bug rtl-optimization/42617] TARGET_MEM_REF and plain INDIRECT_REFs are not handled by the RTL oracle rguenth at gcc dot gnu dot org
2010-01-04 23:25 ` rguenth at gcc dot gnu dot org
2010-01-19 16:30 ` rguenth at gcc dot gnu dot org
2010-01-19 17:02 ` rguenth at gcc dot gnu dot org
2010-01-22 14:06 ` rguenth at gcc dot gnu dot org
2010-01-22 14:07 ` rguenth at gcc dot gnu dot org
2010-01-22 15:21 ` rguenth at gcc dot gnu dot org
2010-01-22 15:24 ` rguenth at gcc dot gnu dot org
2010-02-08 18:45 ` steven at gcc dot gnu dot org
2010-04-07 10:13 ` rguenth at gcc dot gnu dot org
2010-04-07 10:14 ` rguenth at gcc dot gnu dot org
2010-04-07 10:15 ` rguenth at gcc dot gnu dot org
2010-04-07 10:16 ` rguenth at gcc dot gnu dot org
2010-04-07 12:15 ` rguenth at gcc dot gnu dot org

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).