hi all, (first of all, sorry for this unprofessional bug report)
compiling my application with gcc-4.3 with -O2 -ftree-vectorize, it segfaults. i haven't been able to write a stripped-down test case, but here are the information, that i gathered: the constructor of the main data structure of my application contains: 0xb5eb02bd <Environment+205>: movdqa %xmm0,0x1990(%edi) 0xb5eb02c5 <Environment+213>: movdqa %xmm0,0x19a0(%edi) 0xb5eb02cd <Environment+221>: movdqa %xmm0,0x19b0(%edi) 0xb5eb02d5 <Environment+229>: movdqa %xmm0,0x19c0(%edi) 0xb5eb02dd <Environment+237>: movdqa %xmm0,0x19d0(%edi) 0xb5eb02e5 <Environment+245>: movdqa %xmm0,0x19e0(%edi) 0xb5eb02ed <Environment+253>: movdqa %xmm0,0x19f0(%edi) 0xb5eb02f5 <Environment+261>: movdqa %xmm0,0x1a00(%edi) where %edi contains the this pointer to the class. the problem is, that the address, that Environment+205 tries to load seems not to be guarrantied to be aligned to a 16 byte boundary. in my debugging session, it pointed to 0x8369f58, 0x8369f58+0x1990 is not aligned as required by the movdqa instruction, though ... i am using gcc-4.3: Using built-in specs. Target: i486-linux-gnu Configured with: ../src/configure linux gnu Thread model: posix gcc version 4.3.1 20080401 (prerelease) (Debian 4.3.0-3) the command line options are: -g -O3 -march=core2 -mfpmath=sse -msse -ftemplate-depth-4096 -Wnon-virtual-dtor -fPIC unfortunately i haven't been able to construct a smaller test-case ... gcc-4.2 works fine for me ... the preprocessed source file is attached -- Summary: bad code generation with -ftree-vectorize Product: gcc Version: 4.3.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: tim at klingt dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36054