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From: "danfuzz at milk dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug target/17019] New: THUMB -O1: bad code generated for simple for loop Date: Fri, 13 Aug 2004 16:42:00 -0000 [thread overview] Message-ID: <20040813164249.17019.danfuzz@milk.com> (raw) Compiling the following with -O1 for thumb results in bogus code being generated: void badness(int a) { void zorch(int b); int b; for (b = -1; b < a + 1; b++) { zorch(b); } } In particular, it looks like the loop prologue code is screwed up and will cause the loop to always be skipped. Here's how I configured and built the compiler: $ tar -xjvf gcc-core-3.4.0.tar.bz2 $ cd gcc-3.4.0 $ ./configure --prefix=/usr/local/armdev --target=arm-elf --with-newlib --enable-languages=c The following lines were uncommented in gcc/config/arm/t-arm-elf: MULTILIB_OPTIONS += mno-thumb-interwork/mthumb-interwork MULTILIB_DIRNAMES += normal interwork MULTILIB_EXCEPTIONS += *mapcs-26/*mthumb-interwork* $ make $ sudo make install In case it matters, I'm currently using binutils-2.15. I will try this with 3.4.1 shortly. -- Summary: THUMB -O1: bad code generated for simple for loop Product: gcc Version: 3.4.0 Status: UNCONFIRMED Severity: normal Priority: P2 Component: target AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: danfuzz at milk dot com CC: gcc-bugs at gcc dot gnu dot org GCC target triplet: arm-unknown-elf http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17019
next reply other threads:[~2004-08-13 16:42 UTC|newest] Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top 2004-08-13 16:42 danfuzz at milk dot com [this message] 2004-08-13 16:43 ` [Bug target/17019] " danfuzz at milk dot com 2004-08-13 16:45 ` danfuzz at milk dot com 2004-08-13 17:18 ` danfuzz at milk dot com 2004-08-13 17:23 ` danfuzz at milk dot com 2004-08-13 17:54 ` danfuzz at milk dot com 2004-08-13 20:07 ` danfuzz at milk dot com 2004-08-13 20:11 ` danfuzz at milk dot com 2004-08-13 21:23 ` danfuzz at milk dot com 2004-08-13 21:34 ` [Bug target/17019] THUMB: bad switch statement in md code for addsi3_cbranch_scratch danfuzz at milk dot com 2004-08-13 21:36 ` danfuzz at milk dot com 2004-08-16 14:53 ` rearnsha at gcc dot gnu dot org 2004-08-17 10:02 ` cvs-commit at gcc dot gnu dot org 2004-08-17 10:18 ` cvs-commit at gcc dot gnu dot org 2004-08-17 11:32 ` cvs-commit at gcc dot gnu dot org 2004-08-17 11:33 ` rearnsha at gcc dot gnu dot org
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