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bootstrap/8926: Bootstrap comparison failure on linux pentiumpro System!
- From: Harbeck Michael <michael dot harbeck at siemens dot com>
- To: "'gcc-gnats at gcc dot gnu dot org'" <gcc-gnats at gcc dot gnu dot org>
- Date: Fri, 13 Dec 2002 14:49:50 +0100
- Subject: bootstrap/8926: Bootstrap comparison failure on linux pentiumpro System!
>Number: 8926
>Category: bootstrap
>Synopsis: Bootstrap comparison failure on linux pentiumpro System!
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Fri Dec 13 05:56:01 PST 2002
>Closed-Date:
>Last-Modified:
>Originator: Michael Harbeck
>Release: 3.2.1
>Organization:
<organization of PR author (multiple lines)>
>Environment:
System: Linux harbeck2 2.4.19-harbeck2 #1 Fri Oct 11 22:10:55 CEST 2002 i686 unknown
Architecture: i686
Library: GNU C Library stable release version 2.3.1
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: CFLAGS="-g -O3 -march=i686" CXXFLAGS="-g -O3 -march=i686" ../gcc-3.2.1/configure --prefix=/usr/local --enable-threads --enable-version-specific-runtime-libs --program-suffix=-3.2.1 --verbose
compiled with: make bootstrap BOOT_CFLAGS="-g -O3 -march=i686"
>Description:
Bootstrap fails with the following message:
Bootstrap comparison failure!
f/sta.o differs
Further details:
Compilation fails for a pentium pro linux single processor system.
It is not necessary to specify -march=i686; -O3 is sufficient.
>How-To-Repeat:
(1) Configure as specified
(4) make bootstrap as specified above
(3) Copy the file f/sta.c to the gcc compilation directory (the directory
where stage1 and stage2 can be found)
(4) Generate the following directories: tst/stage1 tst/stage2
(5) Run the following compilation steps:
stage2/xgcc -Bstage2/ -B/usr/local/i686-pc-linux-gnu/bin/ -S -da -DIN_GCC -g -O3 -march=i686 -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -DHAVE_CONFIG_H -I. -If -I../../gcc-3.2.1/gcc -I../../gcc-3.2.1/gcc/f -I../../gcc-3.2.1/gcc/config -I../../gcc-3.2.1/gcc/../include sta.c -o tst/stage2/sta.s
mv sta.c.* tst/stage2/
stage1/xgcc -Bstage1/ -B/usr/local/i686-pc-linux-gnu/bin/ -S -da -DIN_GCC -g -O3 -march=i686 -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -DHAVE_CONFIG_H -I. -If -I../../gcc-3.2.1/gcc -I../../gcc-3.2.1/gcc/f -I../../gcc-3.2.1/gcc/config -I../../gcc-3.2.1/gcc/../include sta.c -o tst/stage1/sta.s
mv sta.c.* tst/stage1/
diff -r -u tst/stage1 tst/stage2
(6) Expected output:
diff -r -u tst/stage1/sta.c.15.life tst/stage2/sta.c.15.life
--- tst/stage1/sta.c.15.life Wed Dec 11 16:53:43 2002
+++ tst/stage2/sta.c.15.life Wed Dec 11 16:53:12 2002
@@ -773,7 +773,7 @@
Registers live at start: 6 [bp] 7 [sp] 16 [] 20 [frame] 59
Registers live at end: 6 [bp] 7 [sp] 16 [] 20 [frame] 59
-Basic block 48: first insn 1152, last 593, loop_depth 0, count 0, freq 0.
+Basic block 48: first insn 1152, last 593, loop_depth 0, count 0, freq 1.
Predecessors: 47 [1.0%] (fallthru)
Successors:
Registers live at start: 7 [sp] 16 [] 20 [frame]
@@ -785,7 +785,7 @@
Registers live at start: 6 [bp] 7 [sp] 16 [] 20 [frame] 59 186
Registers live at end: 6 [bp] 7 [sp] 16 [] 20 [frame] 59
-Basic block 50: first insn 615, last 648, loop_depth 5, count 0, freq 100.
+Basic block 50: first insn 615, last 648, loop_depth 5, count 0, freq 99.
Predecessors: 49 [100.0%] (fallthru) 47 [99.0%]
Successors: 53 [100.0%]
Registers live at start: 6 [bp] 7 [sp] 16 [] 20 [frame] 59
diff -r -u tst/stage1/sta.c.20.lreg tst/stage2/sta.c.20.lreg
--- tst/stage1/sta.c.20.lreg Wed Dec 11 16:53:46 2002
+++ tst/stage2/sta.c.20.lreg Wed Dec 11 16:53:14 2002
@@ -599,7 +599,7 @@
Registers live at start: 6 [bp] 7 [sp] 16 [] 20 [frame] 59
Registers live at end: 6 [bp] 7 [sp] 16 [] 20 [frame] 59
-Basic block 48: first insn 1152, last 593, loop_depth 0, count 0, freq 0.
+Basic block 48: first insn 1152, last 593, loop_depth 0, count 0, freq 1.
Predecessors: 47 [1.0%] (fallthru)
Successors:
Registers live at start: 7 [sp] 16 [] 20 [frame]
@@ -611,7 +611,7 @@
Registers live at start: 6 [bp] 7 [sp] 16 [] 20 [frame] 59 186
Registers live at end: 6 [bp] 7 [sp] 16 [] 20 [frame] 59
-Basic block 50: first insn 615, last 648, loop_depth 5, count 0, freq 100.
+Basic block 50: first insn 615, last 648, loop_depth 5, count 0, freq 99.
Predecessors: 49 [100.0%] (fallthru) 47 [99.0%]
Successors: 53 [100.0%]
Registers live at start: 6 [bp] 7 [sp] 16 [] 20 [frame] 59
diff -r -u tst/stage1/sta.c.23.flow2 tst/stage2/sta.c.23.flow2
--- tst/stage1/sta.c.23.flow2 Wed Dec 11 16:53:49 2002
+++ tst/stage2/sta.c.23.flow2 Wed Dec 11 16:53:17 2002
@@ -339,7 +339,7 @@
Registers live at start: 5 [di] 6 [bp] 7 [sp] 16 [] 20 [frame]
Registers live at end: 5 [di] 6 [bp] 7 [sp] 16 [] 20 [frame]
-Basic block 47: first insn 1152, last 1318, loop_depth 0, count 0, freq 0.
+Basic block 47: first insn 1152, last 1318, loop_depth 0, count 0, freq 1.
Predecessors: 46 [1.0%] (fallthru)
Successors: 75 [100.0%]
Registers live at start: 7 [sp]
@@ -351,7 +351,7 @@
Registers live at start: 1 [dx] 5 [di] 6 [bp] 7 [sp] 16 [] 20 [frame]
Registers live at end: 5 [di] 6 [bp] 7 [sp] 16 [] 20 [frame]
-Basic block 49: first insn 615, last 648, loop_depth 5, count 0, freq 100.
+Basic block 49: first insn 615, last 648, loop_depth 5, count 0, freq 99.
Predecessors: 48 [100.0%] (fallthru) 46 [99.0%]
Successors: 51 [100.0%]
Registers live at start: 5 [di] 6 [bp] 7 [sp] 16 [] 20 [frame]
@@ -507,13 +507,13 @@
Registers live at start: 7 [sp]
Registers live at end: 7 [sp]
-Basic block 75: first insn 1317, last 1050, loop_depth 0, count 0, freq 0.
+Basic block 75: first insn 1317, last 1050, loop_depth 0, count 0, freq 1.
Predecessors: 47 [100.0%] 74 [100.0%] (fallthru)
Successors: 76 [100.0%] (fallthru)
Registers live at start: 7 [sp]
Registers live at end: 7 [sp]
-Basic block 76: first insn 1309, last 1051, loop_depth 0, count 0, freq 1.
+Basic block 76: first insn 1309, last 1051, loop_depth 0, count 0, freq 2.
Predecessors: 4 [100.0%] 17 [100.0%] 27 [100.0%] 29 [100.0%] 71 [100.0%] 75 [100.0%] (fallthru)
Successors:
Registers live at start: 7 [sp]
diff -r -u tst/stage1/sta.c.29.bbro tst/stage2/sta.c.29.bbro
--- tst/stage1/sta.c.29.bbro Wed Dec 11 16:53:51 2002
+++ tst/stage2/sta.c.29.bbro Wed Dec 11 16:53:19 2002
@@ -327,7 +327,7 @@
Registers live at start: 5 [di] 6 [bp] 7 [sp] 16 [] 20 [frame]
Registers live at end: 5 [di] 6 [bp] 7 [sp] 16 [] 20 [frame]
-Basic block 47: first insn 1152, last 1318, loop_depth 0, count 0, freq 0.
+Basic block 47: first insn 1152, last 1318, loop_depth 0, count 0, freq 1.
Predecessors: 46 [1.0%] (fallthru)
Successors: 75 [100.0%]
Registers live at start: 7 [sp]
@@ -339,7 +339,7 @@
Registers live at start: 1 [dx] 5 [di] 6 [bp] 7 [sp] 16 [] 20 [frame]
Registers live at end: 5 [di] 6 [bp] 7 [sp] 16 [] 20 [frame]
-Basic block 49: first insn 615, last 648, loop_depth 5, count 0, freq 100.
+Basic block 49: first insn 615, last 648, loop_depth 5, count 0, freq 99.
Predecessors: 48 [100.0%] (fallthru) 46 [99.0%]
Successors: 51 [100.0%]
Registers live at start: 5 [di] 6 [bp] 7 [sp] 16 [] 20 [frame]
@@ -495,13 +495,13 @@
Registers live at start: 7 [sp]
Registers live at end: 7 [sp]
-Basic block 75: first insn 1317, last 1050, loop_depth 0, count 0, freq 0.
+Basic block 75: first insn 1317, last 1050, loop_depth 0, count 0, freq 1.
Predecessors: 47 [100.0%] 74 [100.0%] (fallthru)
Successors: 76 [100.0%] (fallthru)
Registers live at start: 7 [sp]
Registers live at end: 7 [sp]
-Basic block 76: first insn 1309, last 1051, loop_depth 0, count 0, freq 1.
+Basic block 76: first insn 1309, last 1051, loop_depth 0, count 0, freq 2.
Predecessors: 4 [100.0%] 17 [100.0%] 27 [100.0%] 29 [100.0%] 71 [100.0%] 75 [100.0%] (fallthru)
Successors:
Registers live at start: 7 [sp]
@@ -561,7 +561,7 @@
32 bb 42 freq 50
33 bb 43 freq 41
34 bb 48 freq 50
- 35 bb 51 freq 100
+ 35 bb 51 freq 99
36 bb 53 freq 187
37 bb 54 freq 1414
38 bb 55 freq 1203
@@ -580,8 +580,8 @@
51 bb 74 freq 0
52 bb 76 freq 2
53 bb 77 freq 0
- 54 compensation bb 78 freq 0
- 55 compensation bb 79 freq 1
+ 54 compensation bb 78 freq 1
+ 55 compensation bb 79 freq 2
56 bb 65 freq 32
57 bb 66 freq 4
58 bb 67 freq 0
@@ -589,7 +589,7 @@
60 bb 56 freq 349
61 bb 57 freq 211
62 bb 58 freq 105
- 63 bb 49 freq 0
+ 63 bb 49 freq 1
64 bb 44 freq 10
65 bb 45 freq 5
66 bb 46 freq 4
diff -r -u tst/stage1/sta.s tst/stage2/sta.s
--- tst/stage1/sta.s Wed Dec 11 16:53:52 2002
+++ tst/stage2/sta.s Wed Dec 11 16:53:19 2002
@@ -554,7 +554,6 @@
movl $.LC1, 12(%esp)
movl $410, 8(%esp)
jmp .L93
- .p2align 4,,7
.L44:
.loc 1 403 0
cmpb $0, ffesta_seen_first_exec
>Fix:
Do not compile gcc with -O3 but -O2? May be this is neither a
workaround nor a fix, because you cannot be sure, that there is no file
where the error may occur.
>Release-Note:
>Audit-Trail:
>Unformatted:
X-send-pr-version: 3.113
X-GNATS-Notify:
SEND-PR: Leave "Confidential" as "no"; all GCC PRs are public.
SEND-PR: critical GCC is completely not operational; no work-around known.
SEND-PR: serious GCC is not working properly; a work-around is possible.
SEND-PR: non-critical Report indicates minor problem.
SEND-PR: medium The problem should be solved in the next release.
SEND-PR: low The problem should be solve in a future release.
SEND-PR: doc-bug The documentation is incorrect.
SEND-PR: accepts-illegal GCC fails to reject erroneous code.
SEND-PR: rejects-legal GCC gives an error message for correct code.
SEND-PR: wrong-code The machine code generated by gcc is incorrect.
SEND-PR: ice-on-legal-code GCC gives an Internal Compiler Error (ICE)
SEND-PR: for correct code
SEND-PR: ice-on-illegal-code GCC gives an ICE instead of reporting an error
SEND-PR: pessimizes-code GCC misses an important optimization opportunity
SEND-PR: sw-bug Software bug of some other class than above
SEND-PR: change-request A feature in GCC is missing.
SEND-PR: support I need help with gcc.