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emit-rtl.c: (hard_frame_pointer_rtx): New variable. 

* emit-rtl.c: (hard_frame_pointer_rtx): New variable.
(gen_rtx): return hard_frame_pointer_rtx if generating rtl
for HARD_FRAME_POINTER_REGNUM.
(enit_emit_once): Generate initial rtl for hard_frame_pointer_rtx.

From-SVN: r5453
This commit is contained in:
Doug Evans 1993-09-24 19:39:25 +00:00
parent 804f56d8d9
commit ac6f08b075
1 changed files with 21 additions and 1 deletions
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22
gcc/emit-rtl.c
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@ -128,10 +128,18 @@ REAL_VALUE_TYPE dconstm1;
But references that were originally to the frame-pointer can be
distinguished from the others because they contain frame_pointer_rtx.
When to use frame_pointer_rtx and hard_frame_pointer_rtx is a little
tricky: until register elimination has taken place hard_frame_pointer_rtx
should be used if it is being set, and frame_pointer_rtx otherwise. After
register elimination hard_frame_pointer_rtx should always be used.
On machines where the two registers are same (most) then these are the
same.
In an inline procedure, the stack and frame pointer rtxs may not be
used for anything else. */
rtx stack_pointer_rtx; /* (REG:Pmode STACK_POINTER_REGNUM) */
rtx frame_pointer_rtx; /* (REG:Pmode FRAME_POINTER_REGNUM) */
rtx hard_frame_pointer_rtx; /* (REG:Pmode HARD_FRAME_POINTER_REGNUM) */
rtx arg_pointer_rtx; /* (REG:Pmode ARG_POINTER_REGNUM) */
rtx struct_value_rtx; /* (REG:Pmode STRUCT_VALUE_REGNUM) */
rtx struct_value_incoming_rtx; /* (REG:Pmode STRUCT_VALUE_INCOMING_REGNUM) */
@ -305,7 +313,12 @@ gen_rtx (va_alist)
if (frame_pointer_rtx && regno == FRAME_POINTER_REGNUM && mode == Pmode
&& ! reload_in_progress)
return frame_pointer_rtx;
#if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
#if FRAME_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
if (hard_frame_pointer_rtx && regno == HARD_FRAME_POINTER_REGNUM
&& mode == Pmode && ! reload_in_progress)
return hard_frame_pointer_rtx;
#endif
#if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM && HARD_FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
if (arg_pointer_rtx && regno == ARG_POINTER_REGNUM && mode == Pmode
&& ! reload_in_progress)
return arg_pointer_rtx;
@ -3152,8 +3165,15 @@ init_emit_once (line_numbers)
stack_pointer_rtx = gen_rtx (REG, Pmode, STACK_POINTER_REGNUM);
frame_pointer_rtx = gen_rtx (REG, Pmode, FRAME_POINTER_REGNUM);
if (HARD_FRAME_POINTER_REGNUM == FRAME_POINTER_REGNUM)
hard_frame_pointer_rtx = frame_pointer_rtx;
else
hard_frame_pointer_rtx = gen_rtx (REG, Pmode, HARD_FRAME_POINTER_REGNUM);
if (FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM)
arg_pointer_rtx = frame_pointer_rtx;
else if (HARD_FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM)
arg_pointer_rtx = hard_frame_pointer_rtx;
else if (STACK_POINTER_REGNUM == ARG_POINTER_REGNUM)
arg_pointer_rtx = stack_pointer_rtx;
else