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[Bug bootstrap/52391] [4.7 regression] genattrtab almost 5X slower for m68k than in 4.6 and earlier releases

From: "steven at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
To: gcc-bugs at gcc dot gnu dot org
Date: Tue, 28 Feb 2012 00:13:29 +0000
Subject: [Bug bootstrap/52391] [4.7 regression] genattrtab almost 5X slower for m68k than in 4.6 and earlier releases
Auto-submitted: auto-generated
References: <bug-52391-4@http.gcc.gnu.org/bugzilla/>

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52391

Steven Bosscher <steven at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |steven at gcc dot gnu.org

--- Comment #9 from Steven Bosscher <steven at gcc dot gnu.org> 2012-02-28 00:13:29 UTC ---
Well, we do seem to go a bit to extremes to simplify an expression:
#2212 0x0000000000407445 in simplify_test_exp (exp=0x78f010, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2595
#2213 0x0000000000406f8f in simplify_test_exp (exp=0x78f390, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2506
#2214 0x0000000000407445 in simplify_test_exp (exp=0x78f010, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2595
#2215 0x0000000000406f8f in simplify_test_exp (exp=0x78f350, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2506
#2216 0x0000000000407445 in simplify_test_exp (exp=0x78f010, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2595
#2217 0x0000000000406f8f in simplify_test_exp (exp=0x78f310, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2506
#2218 0x0000000000407445 in simplify_test_exp (exp=0x78f010, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2595
#2219 0x0000000000406f8f in simplify_test_exp (exp=0x78f2d0, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2506
#2220 0x0000000000407445 in simplify_test_exp (exp=0x78f010, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2595
#2221 0x0000000000406f8f in simplify_test_exp (exp=0x78f290, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2506
#2222 0x0000000000407445 in simplify_test_exp (exp=0x78f010, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2595
#2223 0x0000000000406f8f in simplify_test_exp (exp=0x78f250, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2506
#2224 0x0000000000407445 in simplify_test_exp (exp=0x78f010, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2595
#2225 0x0000000000406f8f in simplify_test_exp (exp=0x78f210, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2506
#2226 0x0000000000407445 in simplify_test_exp (exp=0x78f010, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2595
#2227 0x0000000000406f8f in simplify_test_exp (exp=0x78f1d0, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2506
#2228 0x0000000000407445 in simplify_test_exp (exp=0x78f010, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2595
#2229 0x0000000000406f8f in simplify_test_exp (exp=0x78f190, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2506
#2230 0x0000000000407445 in simplify_test_exp (exp=0x78f010, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2595
#2231 0x0000000000406f8f in simplify_test_exp (exp=0x78f150, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2506
#2232 0x0000000000407445 in simplify_test_exp (exp=0x78f010, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2595
#2233 0x0000000000406f8f in simplify_test_exp (exp=0x78f110, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2506
#2234 0x0000000000407445 in simplify_test_exp (exp=0x78f010, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2595
#2235 0x0000000000406f8f in simplify_test_exp (exp=0x78f0d0, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2506
#2236 0x0000000000407445 in simplify_test_exp (exp=0x78f010, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2595
#2237 0x0000000000406f8f in simplify_test_exp (exp=0x78f090, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2506
#2238 0x0000000000407445 in simplify_test_exp (exp=0x78f010, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2595
#2239 0x0000000000406f8f in simplify_test_exp (exp=0x78f050, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2506
#2240 0x0000000000407445 in simplify_test_exp (exp=0x78f010, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2595
#2241 0x00000000004074da in simplify_test_exp (exp=0x76f300, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2602
#2242 0x0000000000406a02 in simplify_test_exp_in_temp (exp=0x76f300,
insn_code=0, insn_index=65) at ../../trunk/gcc/genattrtab.c:2335
#2243 0x0000000000405246 in simplify_cond (exp=0x739890, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:1671
#2244 0x0000000000408225 in optimize_attrs () at
../../trunk/gcc/genattrtab.c:2877
#2245 0x000000000040cfe9 in main (argc=3, argv=0x7fffffffe328) at
../../trunk/gcc/genattrtab.c:5023
(gdb)


It's not very productive, either:

#2230 0x0000000000407445 in simplify_test_exp (exp=0x78f010, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2595
2595                  return SIMPLIFY_TEST_EXP (newexp, insn_code, insn_index);
(gdb) call print_rtl (stderr,exp)
(and (eq_attr/u/i ("cpu") ("cfv4"))
    (eq_attr_alt/s 1 1))
(gdb) down
#2229 0x0000000000406f8f in simplify_test_exp (exp=0x78f190, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2506
2506          right = SIMPLIFY_TEST_EXP (XEXP (exp, 1), insn_code, insn_index);
(gdb) call print_rtl (stderr,exp)
(and (eq_attr_alt/s 2 0)
    (and (eq_attr/u/i ("cpu") ("cfv4"))
        (eq_attr_alt/s 1 1)))
(gdb) down
#2228 0x0000000000407445 in simplify_test_exp (exp=0x78f010, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2595
2595                  return SIMPLIFY_TEST_EXP (newexp, insn_code, insn_index);
(gdb) call print_rtl (stderr,exp)
(and (eq_attr/u/i ("cpu") ("cfv4"))
    (eq_attr_alt/s 1 1))
(gdb) down
#2227 0x0000000000406f8f in simplify_test_exp (exp=0x78f1d0, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2506
2506          right = SIMPLIFY_TEST_EXP (XEXP (exp, 1), insn_code, insn_index);
(gdb) call print_rtl (stderr,exp)
(and (eq_attr_alt/s 2 0)
    (and (eq_attr/u/i ("cpu") ("cfv4"))
        (eq_attr_alt/s 1 1)))
(gdb) down
#2226 0x0000000000407445 in simplify_test_exp (exp=0x78f010, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2595
2595                  return SIMPLIFY_TEST_EXP (newexp, insn_code, insn_index);
(gdb) call print_rtl (stderr,exp)
(and (eq_attr/u/i ("cpu") ("cfv4"))
    (eq_attr_alt/s 1 1))
(gdb) down
#2225 0x0000000000406f8f in simplify_test_exp (exp=0x78f210, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2506
2506          right = SIMPLIFY_TEST_EXP (XEXP (exp, 1), insn_code, insn_index);
(gdb) call print_rtl (stderr,exp)
(and (eq_attr_alt/s 2 0)
    (and (eq_attr/u/i ("cpu") ("cfv4"))
        (eq_attr_alt/s 1 1)))
(gdb) down
#2224 0x0000000000407445 in simplify_test_exp (exp=0x78f010, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2595
2595                  return SIMPLIFY_TEST_EXP (newexp, insn_code, insn_index);
(gdb) call print_rtl (stderr,exp)
(and (eq_attr/u/i ("cpu") ("cfv4"))
    (eq_attr_alt/s 1 1))
(gdb) down
#2223 0x0000000000406f8f in simplify_test_exp (exp=0x78f250, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2506
2506          right = SIMPLIFY_TEST_EXP (XEXP (exp, 1), insn_code, insn_index);
(gdb) call print_rtl (stderr,exp)
(and (eq_attr_alt/s 2 0)
    (and (eq_attr/u/i ("cpu") ("cfv4"))
        (eq_attr_alt/s 1 1)))
(gdb) down
#2222 0x0000000000407445 in simplify_test_exp (exp=0x78f010, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2595
2595                  return SIMPLIFY_TEST_EXP (newexp, insn_code, insn_index);
(gdb) call print_rtl (stderr,exp)
(and (eq_attr/u/i ("cpu") ("cfv4"))
    (eq_attr_alt/s 1 1))
(gdb) down
#2221 0x0000000000406f8f in simplify_test_exp (exp=0x78f290, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2506
2506          right = SIMPLIFY_TEST_EXP (XEXP (exp, 1), insn_code, insn_index);
(gdb) call print_rtl (stderr,exp)
(and (eq_attr_alt/s 2 0)
    (and (eq_attr/u/i ("cpu") ("cfv4"))
        (eq_attr_alt/s 1 1)))
(gdb) down
#2220 0x0000000000407445 in simplify_test_exp (exp=0x78f010, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2595
2595                  return SIMPLIFY_TEST_EXP (newexp, insn_code, insn_index);
(gdb) call print_rtl (stderr,exp)
(and (eq_attr/u/i ("cpu") ("cfv4"))
    (eq_attr_alt/s 1 1))
(gdb) down
#2219 0x0000000000406f8f in simplify_test_exp (exp=0x78f2d0, insn_code=0,
insn_index=65) at ../../trunk/gcc/genattrtab.c:2506
2506          right = SIMPLIFY_TEST_EXP (XEXP (exp, 1), insn_code, insn_index);
(gdb) call print_rtl (stderr,exp)
(and (eq_attr_alt/s 2 0)
    (and (eq_attr/u/i ("cpu") ("cfv4"))
        (eq_attr_alt/s 1 1)))
(gdb) (etc...)

References:
- [Bug other/52391] New: [4.7 regression] genattrtab almost 5X slower for m68k than in 4.6 and earlier releases
  - From: mikpe at it dot uu.se

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