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pa.c (compute_frame_size): Update comments to reflect reality.

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* pa.c (compute_frame_size): Update comments to reflect reality.
        (hppa_expand_prologue): Don't save registers which aren't
        used, even if it creates holes.  Partially undoes changes from
        early March.
        (hppa_expand_epilogue): Likewise.

From-SVN: r11567
This commit is contained in:
Jeff Law 1996-03-19 11:57:24 -07:00
parent acc5239d9a
commit d6e35c2d34
1 changed files with 13 additions and 30 deletions
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43
gcc/config/pa/pa.c
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@ -2046,9 +2046,10 @@ compute_frame_size (size, fregs_live)
we need to add this in because of STARTING_FRAME_OFFSET. */
fsize = size + (size || frame_pointer_needed ? 8 : 0);
/* We do not want to create holes in the callee registers that
get saved (confuses gdb), so once we know the highest we just
save all the ones below it, whether they're used or not. */
/* We must leave enough space for all the callee saved registers
from 3 .. highest used callee save register since we don't
know if we're going to have an inline or out of line prologue
and epilogue. */
for (i = 18; i >= 3; i--)
if (regs_ever_live[i])
{
@ -2059,9 +2060,10 @@ compute_frame_size (size, fregs_live)
/* Round the stack. */
fsize = (fsize + 7) & ~7;
/* We do not want to create holes in the callee registers that
get saved (confuses gdb), so once we know the highest we just
save all the ones below it, whether they're used or not. */
/* We must leave enough space for all the callee saved registers
from 3 .. highest used callee save register since we don't
know if we're going to have an inline or out of line prologue
and epilogue. */
for (i = 66; i >= 48; i -= 2)
if (regs_ever_live[i] || regs_ever_live[i + 1])
{
@ -2371,12 +2373,9 @@ hppa_expand_prologue()
was done earlier. */
if (frame_pointer_needed)
{
int found_one = 0;
for (i = 18, offset = local_fsize; i >= 4; i--)
if (regs_ever_live[i] && ! call_used_regs[i]
|| found_one)
if (regs_ever_live[i] && ! call_used_regs[i])
{
found_one = 1;
store_reg (i, offset, FRAME_POINTER_REGNUM);
offset += 4;
gr_saved++;
@ -2387,12 +2386,9 @@ hppa_expand_prologue()
/* No frame pointer needed. */
else
{
int found_one = 0;
for (i = 18, offset = local_fsize - actual_fsize; i >= 3; i--)
if (regs_ever_live[i] && ! call_used_regs[i]
|| found_one)
if (regs_ever_live[i] && ! call_used_regs[i])
{
found_one = 1;
/* If merge_sp_adjust_with_store is nonzero, then we can
optimize the first GR save. */
if (merge_sp_adjust_with_store)
@ -2422,8 +2418,6 @@ hppa_expand_prologue()
/* Floating point register store. */
if (save_fregs)
{
int found_one = 0;
/* First get the frame or stack pointer to the start of the FP register
save area. */
if (frame_pointer_needed)
@ -2434,10 +2428,8 @@ hppa_expand_prologue()
/* Now actually save the FP registers. */
for (i = 66; i >= 48; i -= 2)
{
if (regs_ever_live[i] || regs_ever_live[i + 1]
|| found_one)
if (regs_ever_live[i] || regs_ever_live[i + 1])
{
found_one = 1;
emit_move_insn (gen_rtx (MEM, DFmode,
gen_rtx (POST_INC, DFmode, tmpreg)),
gen_rtx (REG, DFmode, i));
@ -2587,25 +2579,19 @@ hppa_expand_epilogue ()
/* General register restores. */
if (frame_pointer_needed)
{
int found_one = 0;
for (i = 18, offset = local_fsize; i >= 4; i--)
if (regs_ever_live[i] && ! call_used_regs[i]
|| found_one)
if (regs_ever_live[i] && ! call_used_regs[i])
{
found_one = 1;
load_reg (i, offset, FRAME_POINTER_REGNUM);
offset += 4;
}
}
else
{
int found_one = 0;
for (i = 18, offset = local_fsize - actual_fsize; i >= 3; i--)
{
if (regs_ever_live[i] && ! call_used_regs[i]
|| found_one)
if (regs_ever_live[i] && ! call_used_regs[i])
{
found_one = 1;
/* Only for the first load.
merge_sp_adjust_with_load holds the register load
with which we will merge the sp adjustment. */
@ -2626,8 +2612,6 @@ hppa_expand_epilogue ()
/* FP register restores. */
if (save_fregs)
{
int found_one = 0;
/* Adjust the register to index off of. */
if (frame_pointer_needed)
set_reg_plus_d (1, FRAME_POINTER_REGNUM, offset);
@ -2639,7 +2623,6 @@ hppa_expand_epilogue ()
{
if (regs_ever_live[i] || regs_ever_live[i + 1])
{
found_one = 1;
emit_move_insn (gen_rtx (REG, DFmode, i),
gen_rtx (MEM, DFmode,
gen_rtx (POST_INC, DFmode, tmpreg)));