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(output_stack_adjust): New argument TEMP. Changed all callers. 

If the adjust cannot be done with one, but can be done with two
CONST_OK_FOR_I constants, do it that way.

From-SVN: r13213
This commit is contained in:
Joern Rennecke 1996-11-21 20:53:26 +00:00
parent 58cf6a1630
commit 885c9a395a
1 changed files with 30 additions and 10 deletions
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40
gcc/config/sh/sh.c
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@ -2473,12 +2473,15 @@ output_jump_label_table ()
static int extra_push;
/* Adjust the stack and return the number of bytes taken to do it. */
/* Adjust the stack by SIZE bytes. REG holds the rtl of the register
to be adjusted, and TEMP, if nonnegative, holds the register number
of a general register that we may clobber. */
static void
output_stack_adjust (size, reg)
output_stack_adjust (size, reg, temp)
int size;
rtx reg;
int temp;
{
if (size)
{
@ -2487,9 +2490,25 @@ output_stack_adjust (size, reg)
if (! CONST_OK_FOR_I (size))
{
rtx reg = gen_rtx (REG, SImode, 3);
emit_insn (gen_movsi (reg, val));
val = reg;
if (CONST_OK_FOR_I (size / 2) && CONST_OK_FOR_I (size - size / 2))
{
val = GEN_INT (size / 2);
emit_insn (gen_addsi3 (reg, reg, val));
val = GEN_INT (size - size / 2);
}
else
{
rtx reg;
/* If TEMP is invalid, we could temporarily save a general
register to MACL. However, there is currently no need
to handle this case, so just abort when we see it. */
if (temp < 0)
abort ();
reg = gen_rtx (REG, SImode, temp);
emit_insn (gen_movsi (reg, val));
val = reg;
}
}
insn = gen_addsi3 (reg, reg, val);
@ -2615,7 +2634,8 @@ sh_expand_prologue ()
/* We have pretend args if we had an object sent partially in registers
and partially on the stack, e.g. a large structure. */
output_stack_adjust (-current_function_pretend_args_size, stack_pointer_rtx);
output_stack_adjust (-current_function_pretend_args_size,
stack_pointer_rtx, 3);
extra_push = 0;
@ -2644,7 +2664,7 @@ sh_expand_prologue ()
push_regs (live_regs_mask, live_regs_mask2);
output_stack_adjust (-get_frame_size (), stack_pointer_rtx);
output_stack_adjust (-get_frame_size (), stack_pointer_rtx, 3);
if (frame_pointer_needed)
emit_insn (gen_movsi (frame_pointer_rtx, stack_pointer_rtx));
@ -2665,11 +2685,11 @@ sh_expand_epilogue ()
to ensure that instruction scheduling won't move the stack pointer
adjust before instructions reading from the frame. This can fail
if there is an interrupt which then writes to the stack. */
output_stack_adjust (get_frame_size (), frame_pointer_rtx);
output_stack_adjust (get_frame_size (), frame_pointer_rtx, 7);
emit_insn (gen_movsi (stack_pointer_rtx, frame_pointer_rtx));
}
else
output_stack_adjust (get_frame_size (), stack_pointer_rtx);
output_stack_adjust (get_frame_size (), stack_pointer_rtx, 7);
/* Pop all the registers. */
@ -2683,7 +2703,7 @@ sh_expand_epilogue ()
}
output_stack_adjust (extra_push + current_function_pretend_args_size,
stack_pointer_rtx);
stack_pointer_rtx, 7);
}
/* Clear variables at function end. */