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re PR target/78093 ([avr] New variable attribute "absdata" and option "-mabsdata" to enable LDS / STS on Reduced Tiny)

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PR target/78093
	* config/avr/avr.c (avr_decl_maybe_lds_p): New static function.
	(avr_encode_section_info) [TARGET_ABSDATA && AVR_TINY]: Use it.

From-SVN: r242660
This commit is contained in:
Georg-Johann Lay 2016-11-21 12:23:14 +00:00 committed by Georg-Johann Lay
parent e420e419f4
commit e0706cfb33
2 changed files with 40 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2016-11-21 Georg-Johann Lay <avr@gjlay.de>
PR target/78093
* config/avr/avr.c (avr_decl_maybe_lds_p): New static function.
(avr_encode_section_info) [TARGET_ABSDATA && AVR_TINY]: Use it.
2016-11-21 Trevor Saunders <tbsaunde+gcc@tbsaunde.org>
* rtl.h: Adjust prototype.

35
gcc/config/avr/avr.c
View File

@ -10102,6 +10102,38 @@ avr_section_type_flags (tree decl, const char *name, int reloc)
}
/* A helper for the next function. NODE is a decl that is associated with
a symbol. Return TRUE if the respective object may be accessed by LDS.
There might still be other reasons for why LDS is not appropriate.
This function is only appropriate for AVR_TINY. */
static bool
avr_decl_maybe_lds_p (tree node)
{
if (!node
|| TREE_CODE (node) != VAR_DECL
|| DECL_SECTION_NAME (node) != NULL)
return false;
/* Don't use LDS for objects that go to .rodata. The current default
linker description file still locates .rodata in RAM, but this is not
a must. A better linker script would just keep .rodata in flash and
add an offset of 0x4000 to the VMA. Hence avoid LDS for such data. */
if (TREE_READONLY (node))
return false;
// C++ requires peeling arrays.
do
node = TREE_TYPE (node);
while (ARRAY_TYPE == TREE_CODE (node));
return (node != error_mark_node
&& !TYPE_READONLY (node));
}
/* Implement `TARGET_ENCODE_SECTION_INFO'. */
static void
@ -10193,7 +10225,8 @@ avr_encode_section_info (tree decl, rtx rtl, int new_decl_p)
if (avr_decl_absdata_p (decl, DECL_ATTRIBUTES (decl))
|| (TARGET_ABSDATA
&& !progmem_p
&& !addr_attr)
&& !addr_attr
&& avr_decl_maybe_lds_p (decl))
|| (addr_attr
// If addr_attr is non-null, it has an argument. Peek into it.
&& TREE_INT_CST_LOW (TREE_VALUE (TREE_VALUE (addr_attr))) < 0xc0))