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From: "hjl at lucon dot org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/33669] [4.3 Regression] Revision 128957 miscompiles 481.wrf Date: Fri, 05 Oct 2007 23:14:00 -0000 [thread overview] Message-ID: <20071005231431.19841.qmail@sourceware.org> (raw) In-Reply-To: <bug-33669-682@http.gcc.gnu.org/bugzilla/> ------- Comment #4 from hjl at lucon dot org 2007-10-05 23:14 ------- #include <string.h> #include <stdlib.h> typedef struct foo_t { size_t blksz; size_t bf_extent; size_t bf_cnt; void *bf_base; } foo_t; #define _RNDUP(x, unit) ((((x) + (unit) - 1) / (unit)) \ * (unit)) #define _RNDDOWN(x, unit) ((x) - ((x)%(unit))) long long foo(foo_t *const pxp, long long offset, size_t extent) { const long long blkoffset = _RNDDOWN(offset, (long long )pxp->blksz); size_t diff = (size_t)(offset - blkoffset); size_t blkextent = _RNDUP(diff + extent, pxp->blksz); if(pxp->blksz < blkextent) return -1; { void *const middle = pxp->bf_base; if(pxp->bf_cnt > pxp->blksz) { pxp->bf_extent = pxp->blksz; } if(pxp->bf_cnt > 0) { /* copy lower half into upper half */ (void) memcpy(middle, pxp->bf_base, pxp->blksz); } } return blkoffset; } int main () { foo_t x; char buffer [8192]; long long xx; x.blksz = 8192; x.bf_extent = 0; x.bf_cnt = 0; x.bf_base = buffer; xx = foo (&x, 0, 4096); if (xx != 0LL) abort (); return 0; } [hjl@gnu-27 pr33669]$ /export/gnu/import/rrs/128957/usr/bin/gcc foo.c -m32 -O [hjl@gnu-27 pr33669]$ ./a.out Aborted [hjl@gnu-27 pr33669]$ -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33669
next prev parent reply other threads:[~2007-10-05 23:14 UTC|newest] Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top 2007-10-05 14:49 [Bug rtl-optimization/33669] New: " hjl at lucon dot org 2007-10-05 15:00 ` [Bug rtl-optimization/33669] " rguenth at gcc dot gnu dot org 2007-10-05 21:17 ` hjl at lucon dot org 2007-10-05 21:49 ` hjl at lucon dot org 2007-10-05 21:52 ` hjl at lucon dot org 2007-10-05 23:14 ` hjl at lucon dot org [this message] 2007-10-06 2:07 ` hjl at lucon dot org 2007-10-06 2:31 ` hjl at lucon dot org 2007-10-06 4:12 ` zadeck at naturalbridge dot com 2007-10-06 16:17 ` hjl at lucon dot org 2007-10-07 3:18 ` zadeck at naturalbridge dot com 2007-10-07 9:41 ` steven at gcc dot gnu dot org 2007-10-07 11:36 ` zadeck at naturalbridge dot com 2007-10-07 21:57 ` zadeck at naturalbridge dot com 2007-10-08 3:53 ` zadeck at naturalbridge dot com 2007-10-08 20:18 ` seongbae dot park at gmail dot com 2007-10-09 14:00 ` hjl at gcc dot gnu dot org 2007-10-09 15:33 ` zadeck at naturalbridge dot com 2007-10-09 15:41 ` zadeck at naturalbridge dot com 2007-10-09 16:19 ` hjl at lucon dot org 2007-10-10 3:33 ` zadeck at gcc dot gnu dot org 2007-10-10 3:40 ` zadeck at naturalbridge dot com 2007-10-10 3:41 ` zadeck at naturalbridge dot com 2007-10-10 3:47 ` hjl at lucon dot org
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