mpi accelerator hcall fix

diff --git a/gears/services/mpi/hcall.h b/gears/services/mpi/hcall.h
index b9cdeff..483fa99 100644 (file)
--- a/gears/services/mpi/hcall.h
+++ b/gears/services/mpi/hcall.h
@@ -37,7 +37,7 @@
                "vmmcall ;       "                    \
                "movq %%rax, %0; "                    \
                "popq %%rbx; "                        \
-               : "=r"(rc)                            \
+               : "=m"(rc)                            \
                : "m"(id),                            \
                   "m"(a), "m"(b), "m"(c), "m"(d),     \
                  "m"(e), "m"(f), "m"(g), "m"(h)      \