[Bug rtl-optimization/46391] false dependencies are computed after vectorization (#2)
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46391 --- Comment #3 from Roy Rosen roy.1rosen at gmail dot com 2010-11-11 08:03:57 UTC --- It happens also on i386 with ./cc1 -O3 a.c -fdump-rtl-all -funroll-loops -fsched-verbose=8 -fschedule-insns: In asmcons: (insn 16 15 17 4 a.c:5 (set (reg:SI 72 [ vect_var_.26 ]) (mem:SI (plus:SI (reg/v/f:SI 74 [ c ]) (reg:SI 70 [ ivtmp.42 ])) [0 MEM[(char * restrict)vect_p.22]+0 S4 A32])) 50 {*movsi_internal} (nil)) (insn 17 16 134 4 a.c:5 (set (mem:SI (plus:SI (reg/v/f:SI 75 [ d ]) (reg:SI 70 [ ivtmp.42 ])) [0 MEM[(char * restrict)vect_p.27]+0 S4 A32]) (reg:SI 72 [ vect_var_.26 ])) 50 {*movsi_internal} (expr_list:REG_DEAD (reg:SI 72 [ vect_var_.26 ]) (nil))) (insn 134 17 135 4 a.c:5 (set (reg:SI 82 [ vect_var_.26 ]) (mem:SI (plus:SI (plus:SI (reg/v/f:SI 74 [ c ]) (reg:SI 70 [ ivtmp.42 ])) (const_int 4 [0x4])) [0 MEM[(char * restrict)vect_p.22]+0 S4 A32])) 50 {*movsi_internal} (nil)) and in sched1: ;; == ;; -- basic block 4 from 16 to 198 -- before reload ;; == ;; --- forward dependences: ;; --- Region Dependences --- b 4 bb 0 ;; insn codebb dep prio cost reservation ;; -- --- --- ;; 1650 4 035 4 decodern,p2: 198 196 195 185 175 165 155 145 135 17 ;; 1750 4 131 1 decoder0,(p4+p3): 198 196 194 184 174 164 154 144 134 ;; 13450 4 131 4 decodern,p2: 198 196 195 185 175 165 155 145 135 ;; 13550 4 227 1 decoder0,(p4+p3): 198 196 194 184 174 164 154 144 There should not be any dependency between 17 (store) and 134 (load). BTW, I failed building i386 from the current snapshot so I used an old one. (../../gcc-4.6-20101106/gcc/config/i386/bdver1.md:528: unknown mode `V4DF' ../../gcc-4.6-20101106/gcc/config/i386/bdver1.md:528: following context is `0 r egister_operand)' )
[Bug rtl-optimization/46391] false dependencies are computed after vectorization (#2)
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46391 --- Comment #2 from Roy Rosen roy.1rosen at gmail dot com 2010-11-09 13:48:15 UTC --- Seems to me that also on ia64 it is there but the dependecies are still wrong: ;; Function nor (nor) nor (char * restrict c, char * restrict d) { long unsigned int D.2085; long unsigned int D.2086; vector(8) char * restrict D.2087; void * D.2084; long unsigned int ivtmp?52; void * D.2071; void * D.2070; long unsigned int ivtmp?41; long unsigned int ivtmp?38; vector(8) char vect_var_?25; long int andmask?20; long int orptrs1?19; long int addr2int1?18; long int addr2int0?14; int i; char D.2021; bb 2: addr2int0?14_22 = (long int) c_8(D); addr2int1?18_24 = (long int) d_5(D); orptrs1?19_25 = addr2int1?18_24 | addr2int0?14_22; andmask?20_26 = orptrs1?19_25 7; if (andmask?20_26 == 0) goto bb 3; else goto bb 5; bb 3: ivtmp?52_37 = (long unsigned int) c_8(D); D.2085_32 = (long unsigned int) d_5(D); D.2086_48 = D.2085_32 + 256; D.2087_49 = (vector(8) char * restrict) D.2086_48; bb 4: # PT = nonlocal { PARM_RESTRICT?1 } (restr) # ALIGN = 8, MISALIGN = 0 # d_43 = PHI d_44(4), d_5(D)(3) # ivtmp?52_31 = PHI ivtmp?52_30(4), ivtmp?52_37(3) # PT = nonlocal { PARM_RESTRICT?0 } (restr) # ALIGN = 8, MISALIGN = 0 D.2084_33 = (void *) ivtmp?52_31; vect_var_?25_41 = MEM[(char *)D.2084_33]; ivtmp?52_30 = ivtmp?52_31 + 8; MEM[(char *)d_43] = vect_var_?25_41; # PT = nonlocal { PARM_RESTRICT?1 } (restr) d_44 = d_43 + 8; if (d_44 != D.2087_49) goto bb 4; else goto bb 7; bb 5: ivtmp?38_4 = (long unsigned int) c_8(D); ivtmp?41_10 = (long unsigned int) d_5(D); bb 6: # i_28 = PHI 0(5), i_36(6) # ivtmp?38_19 = PHI ivtmp?38_4(5), ivtmp?38_17(6) # ivtmp?41_6 = PHI ivtmp?41_10(5), ivtmp?41_9(6) # PT = nonlocal { PARM_RESTRICT?0 } (restr) D.2070_11 = (void *) ivtmp?38_19; D.2021_34 = MEM[(char *)D.2070_11]; ivtmp?38_17 = ivtmp?38_19 + 1; # PT = nonlocal { PARM_RESTRICT?1 } (restr) D.2071_13 = (void *) ivtmp?41_6; MEM[(char *)D.2071_13] = D.2021_34; ivtmp?41_9 = ivtmp?41_6 + 1; i_36 = i_28 + 1; if (i_36 != 256) goto bb 6; else goto bb 7; bb 7: return 0; }
[Bug rtl-optimization/46391] New: false dependencies are computed after vectorization (#2)
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46391 Summary: false dependencies are computed after vectorization (#2) Product: gcc Version: 4.6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: rtl-optimization AssignedTo: unassig...@gcc.gnu.org ReportedBy: roy.1ro...@gmail.com Created attachment 22343 -- http://gcc.gnu.org/bugzilla/attachment.cgi?id=22343 preprocessed file When compiling function with ia64: int nor(char* __restrict__ c, char* __restrict__ d) { int i, sum = 0; for (i = 0; i 256; i++) d[i] = c[i]; return sum; } before sched1 we have: (insn 91 329 330 4 (set (mem:V8QI (reg/v/f:DI 435 [ d ]) [0 MEM[(char *)d_43]+0 S8 A64]) (reg:V8QI 430 [ vect_var_?25 ])) a.c:5 384 {*movv8qi_internal} (expr_list:REG_DEAD (reg:V8QI 430 [ vect_var_?25 ]) (nil))) (insn 330 91 253 4 (set (reg/f:DI 450) (plus:DI (reg/v/f:DI 435 [ d ]) (const_int 8 [0x8]))) a.c:5 205 {adddi3} (nil)) (insn 253 330 254 4 (set (reg:V8QI 455 [ vect_var_?25 ]) (mem:V8QI (reg:DI 449) [0 MEM[(char *)D.2084_33]+0 S8 A64])) a.c:5 384 {*movv8qi_internal} (nil)) insn 91 is a store and 253 is a load from a different location (two different restrict pointers). These insns should not have a dependency between them but we can see in sched1 that they do have: ;; == ;; -- basic block 4 from 89 to 340 -- before reload ;; == ;; --- forward dependences: ;; --- Region Dependences --- b 4 bb 0 ;; insn codebb dep prio cost reservation ;; -- --- --- ;; 89 384 4 0 1 1 2_M_only_um01: 340 321 320 310 299 288 277 266 255 91 ;; 329 205 4 0 3 1 2_A: 340 320 254 253 ;; 91 384 4 1 0 1 2_M_only_um23: 340 322 321 319 310 308 299 297 288 286 277 275 266 264 255 253 ;; 330 205 4 0 2 1 2_A: 340 322 256 255 ;; 253 384 4 2 1 1 2_M_only_um01: 340 321 310 299 288 277 266 255 ;; 254 205 4 1 2 1 2_A: 340 264 ;; 255 384 4 4 0 1 2_M_only_um23: 340 321 319 310 308 299 297 288 286 277 275 266 264 A similar bug was fixed a few months ago (http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44479). Might be connected. Using built-in specs. COLLECT_GCC=./xgcc Target: ia64-linux-elf Configured with: Thread model: single gcc version 4.6.0 20101106 (experimental) (GCC) COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O3' '-funroll-loops' '-fdump-rtl-all' '-fsched-verbose=8' cc1 -E -quiet -v -iprefix /home/swproj/sw/users/eyalhar/ia64-new/gcc/../lib/gcc/ia64-linux-elf/4.6.0/ a.c -funroll-loops -fdump-rtl-all -fsched-verbose=8 -O3 -fpch-preprocess -o a.i ignoring nonexistent directory /home/swproj/sw/users/eyalhar/ia64-new/gcc/../lib/gcc/ia64-linux-elf/4.6.0/include ignoring nonexistent directory /home/swproj/sw/users/eyalhar/ia64-new/gcc/../lib/gcc/ia64-linux-elf/4.6.0/include-fixed ignoring nonexistent directory /home/swproj/sw/users/eyalhar/ia64-new/gcc/../lib/gcc/ia64-linux-elf/4.6.0/../../../../ia64-linux-elf/sys-include ignoring nonexistent directory /home/swproj/sw/users/eyalhar/ia64-new/gcc/../lib/gcc/ia64-linux-elf/4.6.0/../../../../ia64-linux-elf/include ignoring nonexistent directory /home/swproj/sw/users/eyalhar/ia64-new/gcc/../lib/gcc/../../lib/gcc/ia64-linux-elf/4.6.0/include ignoring nonexistent directory /home/swproj/sw/users/eyalhar/ia64-new/gcc/../lib/gcc/../../lib/gcc/ia64-linux-elf/4.6.0/include-fixed ignoring nonexistent directory /home/swproj/sw/users/eyalhar/ia64-new/gcc/../lib/gcc/../../lib/gcc/ia64-linux-elf/4.6.0/../../../../ia64-linux-elf/sys-include ignoring nonexistent directory /home/swproj/sw/users/eyalhar/ia64-new/gcc/../lib/gcc/../../lib/gcc/ia64-linux-elf/4.6.0/../../../../ia64-linux-elf/include #include ... search starts here: #include ... search starts here: End of search list. COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O3' '-funroll-loops' '-fdump-rtl-all' '-fsched-verbose=8' cc1 -fpreprocessed a.i -quiet -dumpbase a.c -auxbase a -O3 -version -funroll-loops -fdump-rtl-all -fsched-verbose=8 -o a.s GNU C (GCC) version 4.6.0 20101106 (experimental) (ia64-linux-elf) compiled by GNU C version 4.1.2 20080704 (Red Hat 4.1.2-44), GMP version 4.3.2, MPFR version 2.4.2, MPC version 0.8.1 GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096 GNU C (GCC) version 4.6.0 20101106 (experimental) (ia64-linux-elf) compiled by GNU C version 4.1.2 20080704 (Red Hat 4.1.2-44), GMP version 4.3.2, MPFR version 2.4.2, MPC version 0.8.1 GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096 Compiler executable checksum: