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	<83d1y2cf7e DOT fsf AT gnu DOT org>
Date:	Tue, 1 Sep 2015 21:14:05 +0300
Message-ID:	<CAA2C=vCu9fjcEDr_3_FLMXoRzuvmXw57zRkwchbYRD1SpqS4NA@mail.gmail.com>
Subject:	Re: different binary output with 32- and 64-bit hosted compilers
From:	"Ozkan Sezer (sezeroz AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
To:	djgpp AT delorie DOT com
Reply-To:	djgpp AT delorie DOT com
Errors-To:	nobody AT delorie DOT com
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On 9/1/15, Eli Zaretskii (eliz AT gnu DOT org) [via djgpp AT delorie DOT com]
<djgpp AT delorie DOT com> wrote:
>> Date: Tue, 1 Sep 2015 18:20:56 +0300
>> From: "Ozkan Sezer (sezeroz AT gmail DOT com) [via djgpp AT delorie DOT com]"
>> <djgpp AT delorie DOT com>
>>
>> 32-bit (i686-linux fedora-9) and 64-bit (x86_64-linux fedora-20) hosted
>> djgpp-targeting compiler generates different output for some sources.
>> This happens with djgpp source itself too, and it isn't a nice thing
>> and was not an expected thing for me. Did the following with gcc-3.4.6:
>>
>> Compiled djgpp-cvs with a 32- and 64-bit hosted toolchain (gcc-3.4.6
>> and binutils-2.25.1), then did:
>> diff -urp --exclude=*.d --exclude=id_*.o --exclude=stub* \
>>    --exclude=*.tex --exclude=*.exe --exclude=djasm.c \
>>   32/src 64/src > 64.diff
>> ... which results in this:
>
> Looks like sign extension and register allocation differences.
>
> GCC 3.4.6 is quite old, could well be a compiler bug.  Maybe it's a
> good idea to repeat this experiment with a newer version, like 4.9.x?
>

Tried with gcc5, not as bad as gcc-3.4.6 but still shows a difference
(src/debug/fsdb/expr.o still differs)

$ ./i586-pc-msdosdjgpp-gcc -v
Using built-in specs.
COLLECT_GCC=./i586-pc-msdosdjgpp-gcc
COLLECT_LTO_WRAPPER=/home/ozzie/cross-dj5/libexec/gcc/i586-pc-msdosdjgpp/5.2.1/lto-wrapper
Target: i586-pc-msdosdjgpp
Configured with: ../gcc-5.21.r225981/configure
--enable-languages=c,c++ --disable-lto --disable-nls
--target=i586-pc-msdosdjgpp --prefix=/home/ozzie/cross-dj5
Thread model: single
gcc version 5.2.1 20150718 (GCC)


$ diff -urp --exclude=*.d --exclude=*.i --exclude=id_*.o
--exclude=stub* --exclude=*.tex --exclude=*.exe --exclude=djasm.c
32/src 64/src > 64y.diff

Binary files 32/src/debug/fsdb/expr.o and 64/src/debug/fsdb/expr.o differ
diff -urp '--exclude=*.d' '--exclude=*.i' '--exclude=id_*.o'
'--exclude=stub*' '--exclude=*.tex' '--exclude=*.exe'
'--exclude=djasm.c' 32/src/libc/ansi/stdio/doprnt.s
64/src/libc/ansi/stdio/doprnt.s
--- 32/src/libc/ansi/stdio/doprnt.s	2015-09-01 20:57:08.000000000 +0300
+++ 64/src/libc/ansi/stdio/doprnt.s	2015-09-01 21:06:18.258481451 +0300
@@ -4788,85 +4788,85 @@ _NAN_REP.3610:
 	.ascii "NAN\0"
 	.p2align 4
 _powtenneg:
-	.long	-858993459
-	.long	-858993460
+	.long	3435973837
+	.long	3435973836
 	.long	16379
 	.long	1889785610
-	.long	-1546188227
+	.long	2748779069
 	.long	16376
-	.long	-501652180
-	.long	-776530088
+	.long	3793315116
+	.long	3518437208
 	.long	16369
-	.long	-2073964803
-	.long	-1412663535
+	.long	2221002493
+	.long	2882303761
 	.long	16356
-	.long	-1001528997
-	.long	-426404674
+	.long	3293438299
+	.long	3868562622
 	.long	16329
 	.long	1161401530
-	.long	-810475859
+	.long	3484491437
 	.long	16276
-	.long	-1522931291
-	.long	-1468011993
+	.long	2772036005
+	.long	2826955303
 	.long	16170
 	.long	1690100897
-	.long	-573553028
+	.long	3721414268
 	.long	15957
 	.long	1668946234
-	.long	-1070513371
+	.long	3224453925
 	.long	15532
-	.long	-618409444
-	.long	-1874203086
+	.long	3676557852
+	.long	2420764210
 	.long	14682
-	.long	-631783234
-	.long	-1566145883
+	.long	3663184062
+	.long	2728821413
 	.long	12981
 	.long	875965924
-	.long	-827436209
+	.long	3467531087
 	.long	9579
-	.long	-758210594
-	.long	-1495464760
+	.long	3536756702
+	.long	2799502536
 	.long	2776
 	.p2align 4
 _powten:
 	.long	0
-	.long	-1610612736
+	.long	2684354560
 	.long	16386
 	.long	0
-	.long	-939524096
+	.long	3355443200
 	.long	16389
 	.long	0
-	.long	-1673527296
+	.long	2621440000
 	.long	16396
 	.long	0
-	.long	-1094967296
+	.long	3200000000
 	.long	16409
 	.long	67108864
-	.long	-1910781505
+	.long	2384185791
 	.long	16436
 	.long	728806814
-	.long	-1647989336
+	.long	2646977960
 	.long	16489
-	.long	-3168555
-	.long	-1032315063
+	.long	4291798741
+	.long	3262652233
 	.long	16595
-	.long	-2132177696
-	.long	-1816508471
+	.long	2162789600
+	.long	2478458825
 	.long	16808
-	.long	-1644568946
-	.long	-1434522629
+	.long	2650398350
+	.long	2860444667
 	.long	17233
-	.long	-1508994617
-	.long	-484859730
+	.long	2785972679
+	.long	3810107566
 	.long	18083
-	.long	-2123035625
-	.long	-914983546
+	.long	2171931671
+	.long	3379983750
 	.long	19784
-	.long	-985834011
-	.long	-1635042467
+	.long	3309133285
+	.long	2659924829
 	.long	23186
-	.long	-1977575525
-	.long	-1000320510
+	.long	2317391771
+	.long	3294646786
 	.long	29989
 	.p2align 4
 _UPPER_DIGITS:
@@ -4896,13 +4896,13 @@ LC5:
 	.long	1082130432
 	.p2align 4
 LC8:
-	.long	-1977575525
-	.long	-1000320510
+	.long	2317391771
+	.long	3294646786
 	.long	29989
 	.p2align 4
 LC10:
-	.long	-758210594
-	.long	-1495464760
+	.long	3536756702
+	.long	2799502536
 	.long	2776
 	.p2align 2
 LC11:
@@ -4912,6 +4912,6 @@ LC12:
 	.long	520093696
 	.p2align 3
 LC13:
-	.long	-350469331
+	.long	3944497965
 	.long	1058682594
 	.ident	"GCC: (GNU) 5.2.1 20150718"

- Raw text -