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mips-protos.h (mips_expand_before_return): Declare.

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	* config/mips/mips-protos.h (mips_expand_before_return): Declare.
	* config/mips/mips.c (mips_expand_before_return): New function.
	(mips_expand_epilogue): Call it.
	* config/mips/mips.md (return): Turn into a define_expand.
	(*return): New insn.

From-SVN: r136252
This commit is contained in:
Richard Sandiford 2008-06-01 10:01:51 +00:00 committed by Richard Sandiford
parent c41c1387d3
commit 2f7e2abbd1
4 changed files with 34 additions and 1 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2008-06-01 Richard Sandiford <rdsandiford@googlemail.com>
* config/mips/mips-protos.h (mips_expand_before_return): Declare.
* config/mips/mips.c (mips_expand_before_return): New function.
(mips_expand_epilogue): Call it.
* config/mips/mips.md (return): Turn into a define_expand.
(*return): New insn.
2008-06-01 Richard Sandiford <rdsandiford@googlemail.com>
* rtl.h (emit_clobber, gen_clobber, emit_use, gen_use): Declare.

1
gcc/config/mips/mips-protos.h
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@ -257,6 +257,7 @@ extern HOST_WIDE_INT mips_initial_elimination_offset (int, int);
extern rtx mips_return_addr (int, rtx);
extern enum mips_loadgp_style mips_current_loadgp_style (void);
extern void mips_expand_prologue (void);
extern void mips_expand_before_return (void);
extern void mips_expand_epilogue (bool);
extern bool mips_can_use_return_insn (void);
extern rtx mips_function_value (const_tree, enum machine_mode);

19
gcc/config/mips/mips.c
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@ -8633,6 +8633,24 @@ mips_restore_reg (rtx reg, rtx mem)
mips_emit_move (reg, mem);
}
/* Emit any instructions needed before a return. */
void
mips_expand_before_return (void)
{
/* When using a call-clobbered gp, we start out with unified call
insns that include instructions to restore the gp. We then split
these unified calls after reload. These split calls explicitly
clobber gp, so there is no need to define
PIC_OFFSET_TABLE_REG_CALL_CLOBBERED.
For consistency, we should also insert an explicit clobber of $28
before return insns, so that the post-reload optimizers know that
the register is not live on exit. */
if (TARGET_CALL_CLOBBERED_GP)
emit_clobber (pic_offset_table_rtx);
}
/* Expand an "epilogue" or "sibcall_epilogue" pattern; SIBCALL_P
says which. */
@ -8775,6 +8793,7 @@ mips_expand_epilogue (bool sibcall_p)
regno = GP_REG_FIRST + 7;
else
regno = GP_REG_FIRST + 31;
mips_expand_before_return ();
emit_jump_insn (gen_return_internal (gen_rtx_REG (Pmode, regno)));
}
}

7
gcc/config/mips/mips.md
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@ -5739,7 +5739,12 @@
;; Trivial return. Make it look like a normal return insn as that
;; allows jump optimizations to work better.
(define_insn "return"
(define_expand "return"
[(return)]
"mips_can_use_return_insn ()"
{ mips_expand_before_return (); })
(define_insn "*return"
[(return)]
"mips_can_use_return_insn ()"
"%*j\t$31%/"