| Summary: | tree-vect-stmts.c:3340: ubsan error | ||
|---|---|---|---|
| Product: | gcc | Reporter: | David Binderman <dcb314> |
| Component: | c | Assignee: | Richard Sandiford <rsandifo> |
| Status: | RESOLVED FIXED | ||
| Severity: | normal | CC: | rsandifo |
| Priority: | P3 | ||
| Version: | 8.0 | ||
| Target Milestone: | --- | ||
| Host: | Target: | ||
| Build: | Known to work: | ||
| Known to fail: | Last reconfirmed: | 2018-07-23 00:00:00 | |
| Bug Depends on: | |||
| Bug Blocks: | 63426 | ||
svn blame says 262589 rsandifo vec_loop_masks *masks = &LOOP_VINFO_MASKS (loop_vinfo); gcc compiler flag -O3 required. Confirmed. Author: rsandifo Date: Tue Jul 24 18:08:19 2018 New Revision: 262951 URL: https://gcc.gnu.org/viewcvs?rev=262951&root=gcc&view=rev Log: Avoid &LOOP_VINFO_MASKS for bb vectorisation (PR 86618) r262589 introduced another instance of the bug fixed in r258131. 2018-07-23 Richard Sandiford <richard.sandiford@arm.com> gcc/ PR tree-optimization/86618 * tree-vect-stmts.c (vectorizable_call): Don't take the address of LOOP_VINFO_MASKS (loop_vinfo) when loop_vinfo is null. Modified: trunk/gcc/ChangeLog trunk/gcc/tree-vect-stmts.c |
The following C code register struct a *b asm("%r15"); struct a { double *c } d() { (*b).c[1] = copysign(1, (*b).c[1]); (*b).c[0] = copysign(0, (*b).c[0]); } Seems to generate a new runtime error on a ubsan verison of gcc trunk ../results.262549.ubsan/bin/gcc ../results.262835.ubsan/bin/gcc ../../trunk/gcc/tree-vect-stmts.c:3340:19: runtime error: member access within n ull pointer of type 'struct _loop_vec_info' So the error seems to appeared between revisions 262549 and 262835.