From 2e547b13f124ca29dd676bd57ece27888eee5cf1 Mon Sep 17 00:00:00 2001 From: Richard Sandiford Date: Mon, 10 Sep 2001 10:14:13 +0000 Subject: [PATCH] * calls.c (store_one_arg): Expand comment. From-SVN: r45502 --- gcc/ChangeLog | 4 ++++ gcc/calls.c | 10 ++++++++-- 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index df5139d0758..892a74c3a47 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,7 @@ +2001-09-10 Richard Sandiford + + * calls.c (store_one_arg): Expand comment. + 2001-09-10 Roman Lechtchinsky * calls.c (store_one_arg): Make sure that the entire argument is diff --git a/gcc/calls.c b/gcc/calls.c index dc915ad1ff1..f21160fa61e 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 -- 2.30.2