diff options
Diffstat (limited to 'gcc/function.c')
| -rw-r--r-- | gcc/function.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/gcc/function.c b/gcc/function.c index f4f2940..3f1f45b 100644 --- a/gcc/function.c +++ b/gcc/function.c @@ -4603,6 +4603,7 @@ assign_parms (tree fndecl) { rtx offset_rtx; + unsigned int align, boundary; /* If we're passing this arg using a reg, make its stack home the aligned stack slot. */ @@ -4620,8 +4621,24 @@ assign_parms (tree fndecl) offset_rtx)); set_mem_attributes (stack_parm, parm, 1); - set_mem_align (stack_parm, - FUNCTION_ARG_BOUNDARY (promoted_mode, passed_type)); + + boundary = FUNCTION_ARG_BOUNDARY (promoted_mode, passed_type); + align = 0; + + /* If we're padding upward, we know that the alignment of the slot + is FUNCTION_ARG_BOUNDARY. If we're using slot_offset, we're + intentionally forcing upward padding. Otherwise we have to come + up with a guess at the alignment based on OFFSET_RTX. */ + if (locate.where_pad == upward || entry_parm) + align = boundary; + else if (GET_CODE (offset_rtx) == CONST_INT) + { + align = INTVAL (offset_rtx) * BITS_PER_UNIT | boundary; + align = align & -align; + } + if (align > 0) + set_mem_align (stack_parm, align); + if (entry_parm) set_reg_attrs_for_parm (entry_parm, stack_parm); } |