[Bug bootstrap/16341] New: [3.5 Regression] BOOT_CFLAGS='-O2 -fno-inline' causes a comparision failure

["pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

With BOOT_CFLAGS='-O2 -fno-inline' causes a comparision failure.
./combine.o differs
./df.o differs
./emit-rtl.o differs
./final.o differs
./loop.o differs
./recog.o differs
./tree-into-ssa.o differs
./varasm.o differs
cp/decl.o differs
java/parse-scan.o differs

Here is some of combine.o differences:
diff -up temp/combine.s temp1/combine.s
--- temp/combine.s      Fri Jul  2 19:14:06 2004
+++ temp1/combine.s     Fri Jul  2 19:13:32 2004
@@ -26569,42 +26569,43 @@ _combine_instructions:
        stmw r13,-76(r1)
        mfcr r12
        mflr r31
-       cmpwi cr4,r3,0
-       stw r0,8(r1)
        mr r10,r4
-       stw r12,4(r1)
+       stw r0,8(r1)
        li r0,0
+       stw r12,4(r1)
+       cmpwi cr4,r3,0
        addis r11,r31,ha16(_combine_rtl_hooks-"L00000000060$pb")
-       stwu r1,-144(r1)
+       addis r14,r31,ha16(L_rtl_hooks$non_lazy_ptr-"L00000000060$pb")
        la r2,lo16(_combine_rtl_hooks-"L00000000060$pb")(r11)
-       addis r7,r31,ha16(L_rtl_hooks$non_lazy_ptr-"L00000000060$pb")
-       lwz r9,lo16(L_rtl_hooks$non_lazy_ptr-"L00000000060$pb")(r7)
-       mr r30,r3
-       lwz r8,8(r2)
-       mr r3,r4
-       lwz r11,lo16(_combine_rtl_hooks-"L00000000060$pb")(r11)
+       stwu r1,-144(r1)
+       lwz r9,lo16(L_rtl_hooks$non_lazy_ptr-"L00000000060$pb")(r14)
        addis r16,r31,ha16(_combine_attempts-"L00000000060$pb")
-       stw r7,60(r1)
-       addis r14,r31,ha16(_combine_merges-"L00000000060$pb")
+       lwz r8,8(r2)
+       addis r13,r31,ha16(_combine_successes-"L00000000060$pb")
        lwz r7,4(r2)
-       addis r13,r31,ha16(_combine_extras-"L00000000060$pb")
-       addis r15,r31,ha16(_combine_successes-"L00000000060$pb")
+       addis r2,r31,ha16(_combine_extras-"L00000000060$pb")
+       lwz r11,lo16(_combine_rtl_hooks-"L00000000060$pb")(r11)
+       mr r30,r3
+       stw r2,60(r1)

The only reason why I was doing this is because I was trying out IMA (with a couple of patches to fix it 
from Zack and me) but it would fail so I decided to try with -O2 -fno-strict-aliasing and that failed too 
so I then tried -O2 -fno-strict-aliasing -fno-inline and that failed also, so I decided to see I could 
bootstrap with -O2 -fno-strict-aliasing -fno-inline on a clean build but that failed and I then went and 
found that -O2 -fno-inline made it failed.

-- 
           Summary: [3.5 Regression] BOOT_CFLAGS='-O2 -fno-inline' causes a
                    comparision failure
           Product: gcc
           Version: 3.5.0
            Status: UNCONFIRMED
          Keywords: wrong-code, build
          Severity: critical
          Priority: P2
         Component: bootstrap
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16341