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pa.md (return_internal): Add a USE of the PIC register to ensure it is restored after each call. 

* pa.md (return_internal): Add a USE of the PIC register to ensure
        it is restored after each call.
        (return expander): Corresponding changes.

From-SVN: r39193
This commit is contained in:
Jeffrey A Law 2001-01-23 03:52:54 +00:00 committed by Jeff Law
parent 152353171a
commit 2caa0ddfc9
2 changed files with 19 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
Mon Jan 22 20:53:47 2001 Jeffrey A Law (law@cygnus.com)
* pa.md (return_internal): Add a USE of the PIC register to ensure
it is restored after each call.
(return expander): Corresponding changes.
2001-01-22 Franz Sirl <Franz.Sirl-kernel@lauterbach.com>
* rs6000.h (INIT_EXPANDERS): Delete.

15
gcc/config/pa/pa.md
View File

@ -5466,6 +5466,8 @@
;; Unconditional and other jump instructions.
;; This can only be used in a leaf function, so we do
;; not need to use the PIC register.
(define_insn "return"
[(return)
(use (reg:SI 2))
@ -5482,11 +5484,16 @@
;; Use a different pattern for functions which have non-trivial
;; epilogues so as not to confuse jump and reorg.
;;
;; We use the PIC register to ensure it's restored after a
;; call in PIC mode. This can be non-optimal for non-PIC
;; code but the real world cost should be unmeasurable.
(define_insn "return_internal"
[(return)
(use (match_operand:SI 0 "register_operand" "r"))
(use (reg:SI 2))
(const_int 1)]
""
"true_regnum (operands[0]) == PIC_OFFSET_TABLE_REGNUM"
"*
{
if (TARGET_PA_20)
@ -5521,8 +5528,12 @@
emit_jump_insn (gen_return ());
else
{
rtx x;
hppa_expand_epilogue ();
emit_jump_insn (gen_return_internal ());
x = gen_return_internal (gen_rtx_REG (word_mode,
PIC_OFFSET_TABLE_REGNUM));
emit_jump_insn (x);
}
DONE;
}")