https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96895
Bug ID: 96895
Summary: ABI of returning V1DF differs between GCC and clang
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: rguenth at gcc dot gnu.org
Target Milestone: ---
clang and GCC differ in returning v1df:
typedef double v1df __attribute__((vector_size(8)));
v1df foo (v1df x)
{
return x;
}
clang returns in %xmm0 while GCC returns by invisible reference (thus in
memory).
v1df arguments are passed on the stack with both compilers.
GCC behaves this way because the v1df type has BLKmode. If we assign
the type DFmode (V1DFmode is unavailable) then GCC passes and returns in %xmm0.
The target should likely not work on modes here but on types.
