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re PR target/12538 (%l7 is call-clobbered with -mflat -fpic)

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PR target/12538
	* config/sparc/sparc.c (MUST_SAVE_REGISTER): Delete.
	(sparc_flat_must_save_register_p): New function to decide whether
	a register must be saved/restored in the function prologue/epilogue.
	(sparc_flat_compute_frame_size): Use it instead of MUST_SAVE_REGISTER.

From-SVN: r72425
This commit is contained in:
Eric Botcazou 2003-10-13 11:57:48 +02:00 • committed by Eric Botcazou
parent cf27749919
commit 4f0504d907
2 changed files with 38 additions and 8 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2003-10-13 Eric Botcazou <ebotcazou@libertysurf.fr>
PR target/12538
* config/sparc/sparc.c (MUST_SAVE_REGISTER): Delete.
(sparc_flat_must_save_register_p): New function to decide whether
a register must be saved/restored in the function prologue/epilogue.
(sparc_flat_compute_frame_size): Use it instead of MUST_SAVE_REGISTER.
2003-10-12 Steven Bosscher <steven@gcc.gnu.org>
* config/avr/avr.c, config/avr/avr-protos.h: Convert to

38
gcc/config/sparc/sparc.c
View file

@ -7257,17 +7257,39 @@ struct sparc_frame_info current_frame_info;
/* Zero structure to initialize current_frame_info. */
struct sparc_frame_info zero_frame_info;
/* Tell prologue and epilogue if register REGNO should be saved / restored. */
#define RETURN_ADDR_REGNUM 15
#define HARD_FRAME_POINTER_MASK (1 << (HARD_FRAME_POINTER_REGNUM))
#define RETURN_ADDR_MASK (1 << (RETURN_ADDR_REGNUM))
/* Tell prologue and epilogue if register REGNO should be saved / restored. */
#define MUST_SAVE_REGISTER(regno) \
((regs_ever_live[regno] && !call_used_regs[regno]) \
|| (regno == HARD_FRAME_POINTER_REGNUM && frame_pointer_needed) \
|| (regno == RETURN_ADDR_REGNUM && regs_ever_live[RETURN_ADDR_REGNUM]))
static bool
sparc_flat_must_save_register_p (int regno)
{
/* General case: call-saved registers live at some point. */
if (!call_used_regs[regno] && regs_ever_live[regno])
return true;
/* Frame pointer register (%i7) if needed. */
if (regno == HARD_FRAME_POINTER_REGNUM && frame_pointer_needed)
return true;
/* PIC register (%l7) if needed. */
if (regno == (int) PIC_OFFSET_TABLE_REGNUM
&& flag_pic && current_function_uses_pic_offset_table)
return true;
/* Return address register (%o7) if needed. */
if (regno == RETURN_ADDR_REGNUM
&& (regs_ever_live[RETURN_ADDR_REGNUM]
/* When the PIC offset table is used, the PIC register
is set by using a bare call that clobbers %o7. */
|| (flag_pic && current_function_uses_pic_offset_table)))
return true;
return false;
}
/* Return the bytes needed to compute the frame pointer from the current
stack pointer. */
@ -7309,11 +7331,11 @@ sparc_flat_compute_frame_size (int size)
/* Calculate space needed for gp registers. */
for (regno = 1; regno <= 31; regno++)
{
if (MUST_SAVE_REGISTER (regno))
if (sparc_flat_must_save_register_p (regno))
{
/* If we need to save two regs in a row, ensure there's room to bump
up the address to align it to a doubleword boundary. */
if ((regno & 0x1) == 0 && MUST_SAVE_REGISTER (regno+1))
if ((regno & 0x1) == 0 && sparc_flat_must_save_register_p (regno+1))
{
if (gp_reg_size % 8 != 0)
gp_reg_size += 4;