MatCat.OpenSource/8sa1-gcc
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

(call expanders): Reload the PIC register from the fixed callee saved register.

Browse Source 
(call expanders): Reload the PIC register from the fixed callee saved
register.  Don't try to save the PIC register before the call.

From-SVN: r10089
This commit is contained in:
Richard Kenner 1995-06-28 18:04:43 -04:00
parent 853e4dfd6b
commit 1078699763
1 changed files with 16 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
gcc/config/pa/pa.md
View File

@ -3497,24 +3497,6 @@
else
op = XEXP (operands[0], 0);
if (flag_pic)
{
if (!hppa_save_pic_table_rtx)
hppa_save_pic_table_rtx = gen_reg_rtx (Pmode);
/* We must save and restore the PIC register around every call
since we don't have flow information to determine if this save
is redundant with a previous save. The old code assumed once
the register was saved it never needs to be saved again, but
the save could have been on a path which doesn't always
execute; a call site physically later in the program would
then attempt a restore from an uninitialized register! */
emit_insn (gen_rtx (SET, VOIDmode,
hppa_save_pic_table_rtx,
pic_offset_table_rtx));
}
/* Use two different patterns for calls to explicitly named functions
and calls through function pointers. This is necessary as these two
types of calls use different calling conventions, and CSE might try
@ -3530,8 +3512,14 @@
{
use_reg (&CALL_INSN_FUNCTION_USAGE (call_insn), pic_offset_table_rtx);
emit_insn (gen_rtx (SET, VOIDmode, pic_offset_table_rtx,
hppa_save_pic_table_rtx));
/* After each call we must restore the PIC register, even if it
doesn't appear to be used.
This will set regs_ever_live for the callee saved register we
stored the PIC register in. */
emit_move_insn (pic_offset_table_rtx,
gen_rtx (REG, SImode, PIC_OFFSET_TABLE_REGNUM_SAVED));
emit_insn (gen_rtx (USE, VOIDmode, pic_offset_table_rtx));
}
DONE;
}")
@ -3599,24 +3587,6 @@
else
op = XEXP (operands[1], 0);
if (flag_pic)
{
if (!hppa_save_pic_table_rtx)
hppa_save_pic_table_rtx = gen_reg_rtx (Pmode);
/* We must save and restore the PIC register around every call
since we don't have flow information to determine if this save
is redundant with a previous save. The old code assumed once
the register was saved it never needs to be saved again, but
the save could have been on a path which doesn't always
execute; a call site physically later in the program would
then attempt a restore from an uninitialized register! */
emit_insn (gen_rtx (SET, VOIDmode,
hppa_save_pic_table_rtx,
pic_offset_table_rtx));
}
/* Use two different patterns for calls to explicitly named functions
and calls through function pointers. This is necessary as these two
types of calls use different calling conventions, and CSE might try
@ -3635,8 +3605,14 @@
{
use_reg (&CALL_INSN_FUNCTION_USAGE (call_insn), pic_offset_table_rtx);
emit_insn (gen_rtx (SET, VOIDmode, pic_offset_table_rtx,
hppa_save_pic_table_rtx));
/* After each call we must restore the PIC register, even if it
doesn't appear to be used.
This will set regs_ever_live for the callee saved register we
stored the PIC register in. */
emit_move_insn (pic_offset_table_rtx,
gen_rtx (REG, SImode, PIC_OFFSET_TABLE_REGNUM_SAVED));
emit_insn (gen_rtx (USE, VOIDmode, pic_offset_table_rtx));
}
DONE;
}")