Casting integers into vector types (of the same size) causes internal compiler errors. The following illustrates what happens when casting from a constant integer (code shown in How-To-Repeat): ############################################################################## $ gcc -v -c -mmmx cast.c Reading specs from /usr/local/gcc-3.1/lib/gcc-lib/i686-pc-linux-gnu/3.1/specs Configured with: /local/build/gcc/gcc-3.1/configure --prefix=/usr/local/gcc-3.1 --enable-languages=c --disable-nls Thread model: single gcc version 3.1 /usr/local/gcc-3.1/lib/gcc-lib/i686-pc-linux-gnu/3.1/cc1 -lang-c -v -D__GNUC__=3 -D__GNUC_MINOR__=1 -D__GNUC_PATCHLEVEL__=0 -D__ELF__ -Dunix -D__gnu_linux__ -Dlinux -D__ELF__ -D__unix__ -D__gnu_linux__ -D__linux__ -D__unix -D__linux -Asystem=posix -D__NO_INLINE__ -D__STDC_HOSTED__=1 -Acpu=i386 -Amachine=i386 -Di386 -D__i386 -D__i386__ -D__tune_i686__ -D__tune_pentiumpro__ cast.c -quiet -dumpbase cast.c -mmmx -version -o /tmp/cc2ubmWE.s GNU CPP version 3.1 (cpplib) (i386 Linux/ELF) GNU C version 3.1 (i686-pc-linux-gnu) compiled by GNU C version 3.1. ignoring nonexistent directory "/usr/local/gcc-3.1/i686-pc-linux-gnu/include" #include "..." search starts here: #include <...> search starts here: /usr/local/include /usr/local/gcc-3.1/include /usr/local/gcc-3.1/lib/gcc-lib/i686-pc-linux-gnu/3.1/include /usr/include End of search list. cast.c: In function `null': cast.c:6: Internal compiler error in output_constant_pool, at varasm.c:4064 Please submit a full bug report, with preprocessed source if appropriate. See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions. ############################################################################## When casting from a non-volatile variable, a new ICE appears if and only if optimization is enabled: Internal compiler error in subst, at combine.c:3546 This ICE will also manifest itself if one tries to trick the compiler by using a union of "long long" and "v8qi", assigning to the "long long" variable and returning the "v8qi" variable. Again, the ICE only appears when optimization is enabled. Release: 3.1 Environment: System: Linux s 2.4.18 #2 Thu Jun 6 00:23:32 CEST 2002 i686 unknown Distribution: Slackware 8.1 Architecture: i686 host: i686-pc-linux-gnu build: i686-pc-linux-gnu target: i686-pc-linux-gnu configured with: /local/build/gcc/gcc-3.1/configure --prefix=/usr/local/gcc-3.1 --enable-languages=c --disable-nls How-To-Repeat: # 1 "cast.c" typedef int v8qi __attribute__ ((mode(V8QI))); v8qi null(void) { return (v8qi) 0LL; }
Fix: Work-around: Use a volatile temporary variable: /****************************************************************************/ typedef int v8qi __attribute__ ((mode(V8QI))); v8qi null(void) { volatile long long tmp = 0LL; return (v8qi) tmp; } /****************************************************************************/
From: Andrew Pinski <pinskia@physics.uc.edu> To: hakonrk@fys.uio.no Cc: gcc-gnats@gcc.gnu.org Subject: Re: c/7277: Casting integers to vector types causes internal compiler error Date: Thu, 11 Jul 2002 10:12:27 -0400 This has been fixed in: gcc version 3.2 20020709 (experimental) Thanks, Andrew Pinski On Thursday, July 11, 2002, at 10:01 , hakonrk@fys.uio.no wrote: > typedef int v8qi __attribute__ ((mode(V8QI))); > > v8qi null(void) > { > return (v8qi) 0LL; > }
From: Andrew Pinski <pinskia@physics.uc.edu> To: Haakon Riiser <haakon.riiser@fys.uio.no> Cc: gcc-gnats@gcc.gnu.org Subject: Re: c/7277: Casting integers to vector types causes internal compiler error Date: Thu, 11 Jul 2002 11:34:50 -0400 I did not see the option, -mmmx, before sorry. Yes it is still causes an ice. Thanks, Andrew Pinski On Thursday, July 11, 2002, at 11:31 , Haakon Riiser wrote: > -mmmx
From: Haakon Riiser <haakon.riiser@fys.uio.no> To: Andrew Pinski <pinskia@physics.uc.edu> Cc: gcc-gnats@gcc.gnu.org Subject: Re: c/7277: Casting integers to vector types causes internal compiler error Date: Thu, 11 Jul 2002 17:31:45 +0200 [Andrew Pinski] >> # 1 "cast.c" >> typedef int v8qi __attribute__ ((mode(V8QI))); >> >> v8qi null(void) >> { >> return (v8qi) 0LL; >> } > This has been fixed in: gcc version 3.2 20020709 (experimental) Really? From gcc version 3.2 20020711 (experimental): ############################################################################## $ gcc -v -c -mmmx cast.c Reading specs from /mn/rom/u7/hakonrk/i386/gcc-cvs/lib/gcc-lib/i686-pc-linux-gnu/3.2/specs Configured with: /mn/rom/u7/hakonrk/local/susy/src/gcc-cvs/gcc/configure --prefix=/mn/rom/u7/hakonrk/i386/gcc-cvs --enable-languages=c --disable-nls Thread model: single gcc version 3.2 20020711 (experimental) /mn/rom/u7/hakonrk/i386/gcc-cvs/lib/gcc-lib/i686-pc-linux-gnu/3.2/cc1 -quiet -v -D__GNUC__=3 -D__GNUC_MINOR__=2 -D__GNUC_PATCHLEVEL__=0 cast.c -quiet -dumpbase cast.c -mmmx -version -o /tmp/ccJDF0nv.s GNU C version 3.2 20020711 (experimental) (i686-pc-linux-gnu) compiled by GNU C version 3.2 20020711 (experimental). ignoring nonexistent directory "/mn/rom/u7/hakonrk/i386/gcc-cvs/i686-pc-linux-gnu/include" #include "..." search starts here: #include <...> search starts here: /usr/local/include /mn/rom/u7/hakonrk/i386/gcc-cvs/include /mn/rom/u7/hakonrk/i386/gcc-cvs/lib/gcc-lib/i686-pc-linux-gnu/3.2/include /usr/include End of search list. cast.c: In function `null': cast.c:6: internal compiler error: Internal compiler error in output_constant_pool, at varasm.c:3465 Please submit a full bug report, with preprocessed source if appropriate. See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions. ############################################################################## Same thing, except that the line number in varasm.c has changed from 4064 to 3465. -- Haakon
State-Changed-From-To: open->analyzed State-Changed-Why: Confirmed. Still crashes 3.2-branch and mainline.
From: Andrew Pinski <pinskia@physics.uc.edu> To: gcc-gnats@gcc.gnu.org, gcc-bugs@gcc.gnu.org, nobody@gcc.gnu.org, gcc-prs@gcc.gnu.org, hakonrk@fys.uio.no Cc: Andrew Pinski <pinskia@physics.uc.edu> Subject: Re: c/7277: Casting integers to vector types causes internal compiler error Date: Wed, 2 Apr 2003 00:12:43 -0500 Still fails on the mainline: =========================== Starting program: /home/gates/pinskia/linux/lib/gcc-lib/i686-pc-linux-gnu/3.4/cc1 -quiet -v cast.c -quiet -dumpbase cast.c -mmmx -auxbase cast -version -o /tmp/ccejuWIv.s #include "..." search starts here: #include <...> search starts here: /usr/local/include /home/gates/pinskia/linux/include /home/gates/pinskia/linux/lib/gcc-lib/i686-pc-linux-gnu/3.4/include /home/gates/pinskia/linux/i686-pc-linux-gnu/include /usr/include End of search list. GNU C version 3.4 20030401 (experimental) (i686-pc-linux-gnu) compiled by GNU C version 3.4 20030401 (experimental). GGC heuristics: --param ggc-min-expand=98 --param ggc-min-heapsize=128866 cast.c: In function `null': cast.c:6: internal compiler error: in output_constant_pool, at varasm.c:3457 Please submit a full bug report, with preprocessed source if appropriate. See <URL:http://gcc.gnu.org/bugs.html> for instructions. ========================== a little more information: x at this point is a CONST_INT, not a CONST_VECTOR which is what is expecting. Thanks, Andrew Pinski http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit- trail&database=gcc&pr=7277
*** Bug 10963 has been marked as a duplicate of this bug. ***
Still happens on the mainline (20030614).
*** Bug 9572 has been marked as a duplicate of this bug. ***
*** Bug 11215 has been marked as a duplicate of this bug. ***
Fixed on the mainline by a patch by Jan.
Now also fixed on the 3.3 branch (see PR 8869).