Bug 89673

Created attachment 91306 [details]
Warning messages from gas

With gcc-3_3-rhl-branch from CVS on 2003-06-21, I got

Bootstrap comparison failure!
java/decl.o differs
make[3]: *** [compare] Error 1
make[3]: Leaving directory `/export/build/gnu/gcc-3.3-redhat/build-ia64-
linux/gcc'
make[2]: *** [bootstrap] Error 2
make[2]: Leaving directory `/export/build/gnu/gcc-3.3-redhat/build-ia64-linux'

on one machine. It was ok on a different machine. The diff is

--- 1   Sun Jun 22 08:14:37 2003
+++ 2   Sun Jun 22 08:14:44 2003
@@ -1,5 +1,5 @@

-java/decl.o:     file format elf64-ia64-little
+stage2/java/decl.o:     file format elf64-ia64-little

 Disassembly of section .text:

@@ -2054,10 +2054,10 @@ Disassembly of section .text:
     2a50:      0b 70 00 1e 18 10       [MMI]       ld8 r14=[r15];;
     2a56:      70 00 38 0c 72 00                   cmp.eq p7,p6=0,r14
     2a5c:      00 00 04 00                         nop.i 0x0;;
-    2a60:      dc 00 20 40 98 11       [MFB] (p06) st8 [r32]=r8
+    2a60:      fc 00 20 1e 98 11       [MFB] (p07) st8 [r15]=r8
     2a66:      00 00 00 02 00 00                   nop.f 0x0
     2a6c:      00 00 00 20                         nop.b 0x0
-    2a70:      e0 00 20 1e 98 11       [MII] (p07) st8 [r15]=r8
+    2a70:      c0 00 20 40 98 11       [MII] (p06) st8 [r32]=r8
     2a76:      f0 c0 22 00 42 00                   adds r15=88,r8
     2a7c:      04 40 00 84                         mov r32=r8
     2a80:      0a 70 00 46 18 10       [MMI]       ld8 r14=[r35];;

I also got

# /export/build/gnu/gcc-3.3-redhat/build-ia64-linux/gcc/xgcc -
B/export/build/gnu/gcc-3.3-redhat/build-ia64-linux/gcc/ -B/usr/gcc-3.3-
redhat/ia64-unknown-linux-gnu/bin/ -B/usr/gcc-3.3-redhat/ia64-unknown-linux-
gnu/lib/ -isystem /usr/gcc-3.3-redhat/ia64-unknown-linux-gnu/include -c -I. -
I/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/libobjc -O2 -g -O2 -W -Wall -
Wwrite-strings -Wstrict-prototypes -DHAVE_GTHR_DEFAULT -DIN_GCC -
DIN_TARGET_LIBS -I/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/libobjc/objc -
I/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/libobjc/../gcc -
I/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/libobjc/../gcc/config -I../../gcc -
I/net/gnu/export/gnu/src/gcc-3.3-
redhat/gcc/libobjc/../include /net/gnu/export/gnu/src/gcc-3.3-
redhat/gcc/libobjc/init.c -o init.o
/tmp/ccMZj8Qs.s: Assembler messages:
/tmp/ccMZj8Qs.s:1069: Warning: Use of 'mov' may violate WAW dependency 'GR%, % 
in 1 - 127' (impliedf), specific resource number is 14
/tmp/ccMZj8Qs.s:1069: Warning: Only the first path encountering the conflict 
is reported
/tmp/ccMZj8Qs.s:1068: Warning: This is the location of the conflicting usage

#  stage2/xgcc -Bstage2/ -B/usr/gcc-3.3-redhat/ia64-unknown-linux-gnu/bin/ -
c   -g -O2 -DIN_GCC   -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-
prototypes -Wtraditional -pedantic -Wno-long-long   -DHAVE_CONFIG_H    -I. -
I. -I/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc -
I/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc/. -
I/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc/config -
I/net/gnu/export/gnu/src/gcc-3.3-
redhat/gcc/gcc/../include /net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc/c-
opts.c -o c-opts.o
/tmp/cckEZ8Nh.s: Assembler messages:
/tmp/cckEZ8Nh.s:7674: Warning: Use of 'addl' may violate WAW dependency 'GR%, 
% in 1 - 127' (impliedf), specific resource number is 39
/tmp/cckEZ8Nh.s:7674: Warning: Only the first path encountering the conflict 
is reported
/tmp/cckEZ8Nh.s:7673: Warning: This is the location of the conflicting usage

# stage2/xgcc -Bstage2/ -B/usr/gcc-3.3-redhat/ia64-unknown-linux-gnu/bin/ -
c   -g -O2 -DIN_GCC   -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-
prototypes    -DHAVE_CONFIG_H    -I. -Icp -I/net/gnu/export/gnu/src/gcc-3.3-
redhat/gcc/gcc -I/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc/cp -
I/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc/config -
I/net/gnu/export/gnu/src/gcc-3.3-
redhat/gcc/gcc/../include /net/gnu/export/gnu/src/gcc-3.3-
redhat/gcc/gcc/cp/decl.c -o cp/decl.o
/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc/cp/decl.c: In function 
`lookup_tag_reverse':
/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc/cp/decl.c:463: warning: `p' 
might be used uninitialized in this function
/tmp/cccMyvHU.s: Assembler messages:
/tmp/cccMyvHU.s:34208: Warning: Use of 'mov' may violate WAW dependency 'GR%, 
% in 1 - 127' (impliedf), specific resource number is 15
/tmp/cccMyvHU.s:34208: Warning: Only the first path encountering the conflict 
is reported
/tmp/cccMyvHU.s:34206: Warning: This is the location of the conflicting usage

# stage2/xgcc -Bstage2/ -B/usr/gcc-3.3-redhat/ia64-unknown-linux-gnu/bin/ -
c   -g -O2 -DIN_GCC   -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-
prototypes -Wtraditional -pedantic -Wno-long-long   -DHAVE_CONFIG_H    -I. -
I. -I/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc -
I/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc/. -
I/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc/config -
I/net/gnu/export/gnu/src/gcc-3.3-
redhat/gcc/gcc/../include /net/gnu/export/gnu/src/gcc-3.3-
redhat/gcc/gcc/recog.c
/tmp/ccwFzSj0.s: Assembler messages:
/tmp/ccwFzSj0.s:3826: Warning: Use of 'mov' may violate WAW dependency 'GR%, % 
in 1 - 127' (impliedf), specific resource number is 15
/tmp/ccwFzSj0.s:3826: Warning: Only the first path encountering the conflict 
is reported
/tmp/ccwFzSj0.s:3825: Warning: This is the location of the conflicting usage

# stage2/xgcc -Bstage2/ -B/usr/gcc-3.3-redhat/ia64-unknown-linux-gnu/bin/ -
c   -g -O2 -DIN_GCC   -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-
prototypes -Wtraditional -pedantic -Wno-long-long   -DHAVE_CONFIG_H    -I. -
I. -I/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc -
I/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc/. -
I/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc/config -
I/net/gnu/export/gnu/src/gcc-3.3-
redhat/gcc/gcc/../include /net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc/ra-
build.c
/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc/ra-build.c: In function 
`undef_to_size_word':
/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc/ra-build.c:399: warning: `long' 
switch expression not converted to `int' in ISO C
/tmp/cc3Aoz7E.s: Assembler messages:
/tmp/cc3Aoz7E.s:15628: Warning: Use of 'mov' may violate WAW dependency 'GR%, 
% in 1 - 127' (impliedf), specific resource number is 14
/tmp/cc3Aoz7E.s:15628: Warning: Only the first path encountering the conflict 
is reported
/tmp/cc3Aoz7E.s:15627: Warning: This is the location of the conflicting usage

# stage2/xgcc -Bstage2/ -B/usr/gcc-3.3-redhat/ia64-unknown-linux-gnu/bin/ -
c   -g -O2 -DIN_GCC   -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-
prototypes -Wtraditional -pedantic -Wno-long-long   -DHAVE_CONFIG_H    -I. -
I. -I/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc -
I/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc/. -
I/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc/config -
I/net/gnu/export/gnu/src/gcc-3.3-
redhat/gcc/gcc/../include /net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc/ra-
colorize.c
/tmp/ccCV18FL.s: Assembler messages:
/tmp/ccCV18FL.s:17156: Warning: Use of 'mov' may violate WAW dependency 'GR%, 
% in 1 - 127' (impliedf), specific resource number is 15
/tmp/ccCV18FL.s:17155: Warning: This is the location of the conflicting usage

# stage2/xgcc -Bstage2/ -B/usr/gcc-3.3-redhat/ia64-unknown-linux-gnu/bin/ -
c   -g -O2 -DIN_GCC   -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-
prototypes -Wtraditional -pedantic -Wno-long-long   -DHAVE_CONFIG_H    -I. -
I. -I/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc -
I/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc/. -
I/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc/config -
I/net/gnu/export/gnu/src/gcc-3.3-
redhat/gcc/gcc/../include /net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc/ra-
build.c
/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc/ra-build.c: In function 
`undef_to_size_word':
/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc/ra-build.c:399: warning: `long' 
switch expression not converted to `int' in ISO C
/tmp/cc7hOjKX.s: Assembler messages:
/tmp/cc7hOjKX.s:15628: Warning: Use of 'mov' may violate WAW dependency 'GR%, 
% in 1 - 127' (impliedf), specific resource number is 14
/tmp/cc7hOjKX.s:15628: Warning: Only the first path encountering the conflict 
is reported
/tmp/cc7hOjKX.s:15627: Warning: This is the location of the conflicting usage

# stage2/xgcc -Bstage2/ -B/usr/gcc-3.3-redhat/ia64-unknown-linux-gnu/bin/ -
c   -g -O2 -DIN_GCC   -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-
prototypes -Wtraditional -pedantic -Wno-long-long   -DHAVE_CONFIG_H    -I. -
I. -I/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc -
I/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc/. -
I/net/gnu/export/gnu/src/gcc-3.3-redhat/gcc/gcc/config -
I/net/gnu/export/gnu/src/gcc-3.3-
redhat/gcc/gcc/../include /net/gnu/export/gnu/src/gcc-3.3-
redhat/gcc/gcc/optabs.c
/tmp/ccmsrwse.s: Assembler messages:
/tmp/ccmsrwse.s:7471: Warning: Use of 'adds' may violate WAW dependency 'GR%, 
% in 1 - 127' (impliedf), specific resource number is 14
/tmp/ccmsrwse.s:7470: Warning: This is the location of the conflicting usage
/tmp/ccmsrwse.s:7484: Warning: Use of 'adds' may violate WAW dependency 'GR%, 
% in 1 - 127' (impliedf), specific resource number is 14
/tmp/ccmsrwse.s:7483: Warning: This is the location of the conflicting usage

The problem may be related.

All of the dependency violations I've ever seen out of gcc were gas bugs.
To my knowledge, all of them have been fixed for binutils 2.15.  If
you find different, file a more specific bug report.