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From: "samueldotj at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/53790] New: ICE on dereferencing a extern union in asm statement Date: Wed, 27 Jun 2012 21:17:00 -0000 [thread overview] Message-ID: <bug-53790-4@http.gcc.gnu.org/bugzilla/> (raw) http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53790 Bug #: 53790 Summary: ICE on dereferencing a extern union in asm statement Classification: Unclassified Product: gcc Version: 4.6.3 Status: UNCONFIRMED Severity: major Priority: P3 Component: middle-end AssignedTo: unassigned@gcc.gnu.org ReportedBy: samueldotj@gmail.com Created attachment 27713 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27713 Preprocessed sources gcc-4.6.3 causes ICE when compiling program which dereferences a extern union in asm(). It is avoided if the union's structure is made known to the compiler at compile time.(Defined inside the c file or in an include file). Removing optimization(-O0) also avoid this problem. ------------------------------ typedef long long uint64; typedef struct s { uint64 value; } s_t; static inline uint64 do_some_asm(s_t const *var) { uint64 value; __asm__ __volatile__( "xor %1, %0" : "=r" (value) : "r" (var->value) ); return value; } typedef union u u_t; int main() { extern u_t extern_var; return do_some_asm((s_t *)&extern_var); } ---------------------------- $gcc -v -save-temps -O3 sample.c Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-unknown-linux-gnu/4.6.3/lto-wrapper Target: x86_64-unknown-linux-gnu Configured with: ./configure Thread model: posix gcc version 4.6.3 (GCC) COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O3' '-mtune=generic' '-march=x86-64' /usr/local/libexec/gcc/x86_64-unknown-linux-gnu/4.6.3/cc1 -E -quiet -v sample.c -mtune=generic -march=x86-64 -O3 -fpch-preprocess -o sample.i ignoring nonexistent directory "/usr/local/lib/gcc/x86_64-unknown-linux-gnu/4.6.3/../../../../x86_64-unknown-linux-gnu/include" #include "..." search starts here: #include <...> search starts here: /usr/local/lib/gcc/x86_64-unknown-linux-gnu/4.6.3/include /usr/local/include /usr/local/lib/gcc/x86_64-unknown-linux-gnu/4.6.3/include-fixed /usr/include End of search list. COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O3' '-mtune=generic' '-march=x86-64' /usr/local/libexec/gcc/x86_64-unknown-linux-gnu/4.6.3/cc1 -fpreprocessed sample.i -quiet -dumpbase sample.c -mtune=generic -march=x86-64 -auxbase sample -O3 -version -o sample.s GNU C (GCC) version 4.6.3 (x86_64-unknown-linux-gnu) compiled by GNU C version 4.6.3, GMP version 4.3.2, MPFR version 2.4.2-p1, MPC version 0.8.1 GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 GNU C (GCC) version 4.6.3 (x86_64-unknown-linux-gnu) compiled by GNU C version 4.6.3, GMP version 4.3.2, MPFR version 2.4.2-p1, MPC version 0.8.1 GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 Compiler executable checksum: 4cf08a0fcb4b2719a02f394936c437ef sample.c: In function ‘main’: sample.c:15:17: internal compiler error: Segmentation fault Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions. Currently I am working around this by applying the following patch. diff -rupN gcc-4.6.3/gcc/expr.c gcc-4.6.3.new1/gcc/expr.c --- gcc-4.6.3/gcc/expr.c 2012-02-09 09:28:22.000000000 -0800 +++ gcc-4.6.3.new1/gcc/expr.c 2012-06-20 22:53:10.613748645 -0700 @@ -9182,6 +9182,7 @@ expand_expr_real_1 (tree exp, rtx target orig_op0 = op0 = expand_expr (tem, (TREE_CODE (TREE_TYPE (tem)) == UNION_TYPE + && TYPE_SIZE (TREE_TYPE (tem)) && (TREE_CODE (TYPE_SIZE (TREE_TYPE (tem))) != INTEGER_CST) && modifier != EXPAND_STACK_PARM
next reply other threads:[~2012-06-27 21:17 UTC|newest] Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-06-27 21:17 samueldotj at gmail dot com [this message] 2012-06-27 21:18 ` [Bug middle-end/53790] " samueldotj at gmail dot com 2012-06-27 21:20 ` pinskia at gcc dot gnu.org 2012-06-27 21:25 ` samueldotj at gmail dot com 2012-06-27 21:31 ` samueldotj at gmail dot com 2012-06-28 10:00 ` [Bug middle-end/53790] [4.6/4.7/4.8 Regression] " rguenth at gcc dot gnu.org 2012-06-28 11:45 ` rguenth at gcc dot gnu.org 2012-06-28 11:53 ` rguenth at gcc dot gnu.org 2012-06-28 12:01 ` rguenth at gcc dot gnu.org 2012-06-28 12:02 ` rguenth at gcc dot gnu.org 2012-06-28 12:02 ` rguenth at gcc dot gnu.org 2012-06-29 0:26 ` samueldotj at gmail dot com
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