On machines with only a vector/vector shift like the powerpc and spu, the wrong
type is generated for the tree vector that is created with the constant
splat'ed to fill the vector. The problem is the code uses
get_vectype_for_scalar_type, and integer constants don't have a type. So
get_vectype_for_scalar_type returns V4SI, even if the vector in question is
V8HI or V16QI. Before the added type validation was added on April 27th, this
appeared to work because nothing looked at the type field. With the current
code, this can lead to incorrect code being generated, and for larger programs
the compiler will die due to garbage collection failure.
--
Summary: Incorrect tree made for vector shifted by constant on
powerpc, spu
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: meissner at linux dot vnet dot ibm dot com
GCC build triplet: powerpc64-unknown-linux-gnu
GCC host triplet: powerpc64-unknown-linux-gnu
GCC target triplet: powerpc64-unknown-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40049
