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8076523: assert(((ABS(iv_adjustment_in_bytes) % elt_size) == 0)) fails in superword.cpp

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Check that offset % mem_oper_size == 0 when alignment is verified during vectorization.

Reviewed-by: iveresov
This commit is contained in:
Vladimir Kozlov 2015-04-02 17:16:39 -07:00
parent 86e3a8d9f4
commit 81bb7521bd
1 changed files with 7 additions and 5 deletions
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12
hotspot/src/share/vm/opto/superword.cpp
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@ -449,11 +449,13 @@ bool SuperWord::ref_is_alignable(SWPointer& p) {
int preloop_stride = pre_end->stride_con();
int span = preloop_stride * p.scale_in_bytes();
// Stride one accesses are alignable.
if (ABS(span) == p.memory_size())
int mem_size = p.memory_size();
int offset = p.offset_in_bytes();
// Stride one accesses are alignable if offset is aligned to memory operation size.
// Offset can be unaligned when UseUnalignedAccesses is used.
if (ABS(span) == mem_size && (ABS(offset) % mem_size) == 0) {
return true;
}
// If initial offset from start of object is computable,
// compute alignment within the vector.
int vw = vector_width_in_bytes(p.mem());
@ -463,7 +465,7 @@ bool SuperWord::ref_is_alignable(SWPointer& p) {
if (init_nd->is_Con() && p.invar() == NULL) {
int init = init_nd->bottom_type()->is_int()->get_con();
int init_offset = init * p.scale_in_bytes() + p.offset_in_bytes();
int init_offset = init * p.scale_in_bytes() + offset;
assert(init_offset >= 0, "positive offset from object start");
if (span > 0) {