diff options
Diffstat (limited to 'gcc/calls.c')
| -rw-r--r-- | gcc/calls.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/gcc/calls.c b/gcc/calls.c index dc915ad..f21160f 100644 --- a/gcc/calls.c +++ b/gcc/calls.c @@ -4565,8 +4565,14 @@ store_one_arg (arg, argblock, flags, variable_size, reg_parm_stack_space) } } - /* If parm is passed both in stack and in register and offset is - greater than reg_parm_stack_space, split the offset. */ + /* Special handling is required if part of the parameter lies in the + register parameter area. The argument may be copied into the stack + slot using memcpy(), but the original contents of the register + parameter area will be restored after the memcpy() call. + + To ensure that the part that lies in the register parameter area + is copied correctly, we emit a separate push for that part. This + push should be small enough to avoid a call to memcpy(). */ #ifndef STACK_PARMS_IN_REG_PARM_AREA if (arg->reg && arg->pass_on_stack) #else |