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sh.md (symPLT_label2reg): Force the initialization of the PIC register.

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* config/sh/sh.md (symPLT_label2reg): Force the initialization of
the PIC register.

From-SVN: r36225
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Alexandre Oliva 2000-09-07 04:10:27 +00:00 committed by Alexandre Oliva
parent 3a0d3e1e75
commit 71105114a1
2 changed files with 23 additions and 2 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2000-09-07 Alexandre Oliva <aoliva@redhat.com>
* config/sh/sh.md (symPLT_label2reg): Force the initialization of
the PIC register.
2000-09-06 H.J. Lu (hjl@gnu.org)
* Makefile.in (clean_s1): Depend on stage_b.

20
gcc/config/sh/sh.md
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@ -3531,8 +3531,24 @@ else
(plus:SI (pc)
(unspec [(match_operand:SI 1 "" "")] 9))
(const (plus:SI (label_ref (match_operand:SI 2 "" ""))
(const_int 2))))))]
"" "")
(const_int 2))))))
(use (match_dup 2))]
;; Even though the PIC register is not really used by the call
;; sequence in which this is expanded, the PLT code assumes the PIC
;; register is set, so we must not skip its initialization. Since
;; we only use this expand as part of calling sequences, and never
;; to take the address of a function, this is the best point to
;; insert the (use). Using the PLT to take the address of a
;; function would be wrong, not only because the PLT entry could
;; then be called from a function that doesn't initialize the PIC
;; register to the proper GOT, but also because pointers to the same
;; function might not compare equal, should they be set by different
;; shared libraries.
"" "
{
operands[2] = pic_offset_table_rtx;
current_function_uses_pic_offset_table = 1;
}")
;; case instruction for switch statements.