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(global_alloc): Make a more accurate attempt to see if the frame pointer will be used.

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(global_alloc): Make a more accurate attempt to see if the frame pointer will
be used.
If it is, show HARD_FRAME_POINTER_REGNUM used if its not the same as
FRAME_POINTER_REGNUM.

From-SVN: r7604
This commit is contained in:
Richard Kenner 1994-06-29 16:01:31 -04:00
parent 245d26eb97
commit daf55ac69a
1 changed files with 13 additions and 8 deletions
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21
gcc/global.c
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@ -246,7 +246,7 @@ static struct { int allocno1, allocno2;}
static rtx *regs_set; static rtx *regs_set;
static int n_regs_set; static int n_regs_set;
/* All register that can be eliminated. */ /* All registers that can be eliminated. */
static HARD_REG_SET eliminable_regset; static HARD_REG_SET eliminable_regset;
@ -279,6 +279,13 @@ global_alloc (file)
#ifdef ELIMINABLE_REGS #ifdef ELIMINABLE_REGS
static struct {int from, to; } eliminables[] = ELIMINABLE_REGS; static struct {int from, to; } eliminables[] = ELIMINABLE_REGS;
#endif #endif
int need_fp
= (! flag_omit_frame_pointer
#ifdef EXIT_IGNORE_STACK
|| (current_function_calls_alloca && EXIT_IGNORE_STACK)
#endif
|| FRAME_POINTER_REQUIRED);
register int i; register int i;
rtx x; rtx x;
@ -302,20 +309,18 @@ global_alloc (file)
SET_HARD_REG_BIT (eliminable_regset, eliminables[i].from); SET_HARD_REG_BIT (eliminable_regset, eliminables[i].from);
if (! CAN_ELIMINATE (eliminables[i].from, eliminables[i].to) if (! CAN_ELIMINATE (eliminables[i].from, eliminables[i].to)
|| (eliminables[i].from == HARD_FRAME_POINTER_REGNUM || (eliminables[i].to == STACK_POINTER_REGNUM && need_fp))
&& (! flag_omit_frame_pointer || FRAME_POINTER_REQUIRED)))
SET_HARD_REG_BIT (no_global_alloc_regs, eliminables[i].from); SET_HARD_REG_BIT (no_global_alloc_regs, eliminables[i].from);
} }
#if FRAME_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM #if FRAME_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
if (!flag_omit_frame_pointer || FRAME_POINTER_REQUIRED) SET_HARD_REG_BIT (eliminable_regset, HARD_FRAME_POINTER_REGNUM);
if (need_fp)
SET_HARD_REG_BIT (no_global_alloc_regs, HARD_FRAME_POINTER_REGNUM); SET_HARD_REG_BIT (no_global_alloc_regs, HARD_FRAME_POINTER_REGNUM);
#endif #endif
#else #else
SET_HARD_REG_BIT (eliminable_regset, FRAME_POINTER_REGNUM); SET_HARD_REG_BIT (eliminable_regset, FRAME_POINTER_REGNUM);
if (need_fp)
/* If we know we will definitely not be eliminating the frame pointer,
don't allocate it. */
if (! flag_omit_frame_pointer || FRAME_POINTER_REQUIRED)
SET_HARD_REG_BIT (no_global_alloc_regs, FRAME_POINTER_REGNUM); SET_HARD_REG_BIT (no_global_alloc_regs, FRAME_POINTER_REGNUM);
#endif #endif