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From: hakonrk@fys.uio.no To: gcc-gnats@gcc.gnu.org Subject: c/7267: GCC 3.1 crash when using MMX code and -funroll-loops Date: Wed, 10 Jul 2002 16:36:00 -0000 [thread overview] Message-ID: <20020710232719.11656.qmail@s.hn.org> (raw) >Number: 7267 >Category: c >Synopsis: GCC 3.1 crash when using MMX code and -funroll-loops >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: ice-on-legal-code >Submitter-Id: net >Arrival-Date: Wed Jul 10 16:36:00 PDT 2002 >Closed-Date: >Last-Modified: >Originator: Haakon Riiser >Release: 3.1 >Organization: University of Oslo >Environment: System: Linux s 2.4.18 #2 Thu Jun 6 00:23:32 CEST 2002 i686 unknown 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 Also verified o >Description: When compiling the code shown in "How-To-Repeat" with optimization and unroll-loops enabled, GCC 3.1 dies with an internal compiler error. The bug looks exactly the same in GCC 2.96 from Red Hat Linux 7.2 and 7.3, but GCC 2.95.3 produces the following output: foo.c: In function `foo': foo.c:7: invalid `asm': invalid expression as operand foo.c:8: invalid `asm': invalid expression as operand foo.c:7: invalid `asm': invalid expression as operand foo.c:8: invalid `asm': invalid expression as operand The code compiles perfectly with all tested GCC versions when "-funroll-loops" is not used. >How-To-Repeat: Compile with "gcc -c -O -funroll-loops foo.c". Preprocessor output follows: # 1 "foo.c" void foo(char *dst, int w) { int i; for (i = 0; i < 2; i++) { asm volatile ("movq %%mm0, %0\n" : "=X" (*(dst + w * 2))); asm volatile ("movq %%mm0, %0\n" : "=X" (*(dst + w * 2))); dst++; } asm volatile ("emms\n"); } >Fix: Work-around: Don't use -funroll-loops. >Release-Note: >Audit-Trail: >Unformatted:
next reply other threads:[~2002-07-10 23:36 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2002-07-10 16:36 hakonrk [this message] 2002-10-03 11:00 hubicka
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