------- Comment #2 from ubizjak at gmail dot com 2007-04-26 11:20 ------- This bug is due to my commit:
http://gcc.gnu.org/ml/gcc-cvs/2007-04/msg00657.html This patch introduces "vec_unpacks_hi_v4sf" and "vec_unpacks_lo_v4sf" to sse.md an these patterns trigger generic vectorizer problem (related to multiple data types in the loop having VEC_UNPAC_HI/LO and not related to convesions at all) in alignment handling. Polyhedron crashes in: Dump of assembler code from 0x804def2 to 0x804dff2: >> 0x0804def2 <invima+594>: movapd %xmm1,(%eax) 0x0804def6 <invima+598>: cvtps2pd 0xffffff48(%ebp),%xmm0 0x0804defd <invima+605>: movapd %xmm0,0x10(%eax) 0x0804df02 <invima+610>: add $0x20,%eax 0x0804df05 <invima+613>: cmp %edi,%ebx Dorit has confirmed the problem and she is already testing a fix. The C testcase that crashes (you need -O2 -msse2 -ftree-vectorize [-m32]) to trigger the problem, as "z" needs to be aligned to 8 bytes: --cut here-- float x[256]; void foo(void) { double *z = malloc (sizeof(double) * 256); int i; for (i=0; i<256; ++i) z[i] = x[i] + 1.0f; } int main() { int i; for (i = 0; i < 256; i++) x[i] = (float) i; foo(); return 0; } --cut here-- If an urgent fix is needed, then simply rename "vec_unpacks_hi_v4sf" to "*vec_unpacks_hi_v4sf". -- ubizjak at gmail dot com changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |dorit at il dot ibm dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31699
