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Blackfin: change global data register from P5 to P3

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Since the Blackfin ABI favors higher scratch registers by default, use the
last scratch register (P3) for global data rather than the first (P5).
This allows the compiler's register allocator to use higher number scratch
P registers, which in turn better matches the Blackfin instruction set,
which reduces the size of U-Boot by more than 1024 bytes...

Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Robin Getz
2009-08-17 15:23:02 +00:00
committed by Tom Rix
parent f6e33d95df
commit ced6466ed5
5 changed files with 7 additions and 7 deletions
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2
include/asm-blackfin/global_data.h
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@@ -66,6 +66,6 @@ typedef struct global_data {
#define GD_FLG_LOGINIT 0x00020 /* Log Buf has been initialized */
#define GD_FLG_DISABLE_CONSOLE 0x00040 /* Disable console (in & out) */
#define DECLARE_GLOBAL_DATA_PTR register gd_t * volatile gd asm ("P5")
#define DECLARE_GLOBAL_DATA_PTR register gd_t * volatile gd asm ("P3")
#endif