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mips.c (mips_expand_epilogue): Generate a simple_return only if the return address is in r31.

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* config/mips/mips.c (mips_expand_epilogue): Generate a
	simple_return only if the return address is in r31.

From-SVN: r178847
This commit is contained in:
Bernd Schmidt 2011-09-14 11:15:09 +00:00 committed by Bernd Schmidt
parent d4eb366841
commit 3551175193
2 changed files with 20 additions and 5 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2011-09-14 Bernd Schmidt <bernds@codesourcery.com>
* config/mips/mips.c (mips_expand_epilogue): Generate a
simple_return only if the return address is in r31.
2011-09-13 Bernd Schmidt <bernds@codesourcery.com>
* cfgcleanup.c (try_head_merge_bb): If get_condition returns

20
gcc/config/mips/mips.c
View File

@ -10521,7 +10521,7 @@ mips_expand_epilogue (bool sibcall_p)
}
else
{
unsigned int regno;
rtx pat;
/* When generating MIPS16 code, the normal
mips_for_each_saved_gpr_and_fpr path will restore the return
@ -10529,11 +10529,21 @@ mips_expand_epilogue (bool sibcall_p)
if (TARGET_MIPS16
&& !GENERATE_MIPS16E_SAVE_RESTORE
&& BITSET_P (frame->mask, RETURN_ADDR_REGNUM))
regno = GP_REG_FIRST + 7;
{
/* simple_returns cannot rely on values that are only available
on paths through the epilogue (because return paths that do
not pass through the epilogue may nevertheless reuse a
simple_return that occurs at the end of the epilogue).
Use a normal return here instead. */
rtx reg = gen_rtx_REG (Pmode, GP_REG_FIRST + 7);
pat = gen_return_internal (reg);
}
else
regno = RETURN_ADDR_REGNUM;
emit_jump_insn (gen_simple_return_internal (gen_rtx_REG (Pmode,
regno)));
{
rtx reg = gen_rtx_REG (Pmode, RETURN_ADDR_REGNUM);
pat = gen_simple_return_internal (reg);
}
emit_jump_insn (pat);
}
}