From: "Seongbae Park (박성배, 朴成培)" <[EMAIL PROTECTED]>
Date: Tue, 16 Oct 2007 22:56:49 -0700
> Did you replace the DF_REF_REG_USE with DEF ?
> If so, that's not correct. We need to add DEF as well as USE:
...
> Then, we'll need to change the df_invalidated_by_call loop
> not to add global_regs[] again (with MAY_CLOBBER bits).
Seongbae-ssi, I've done full regstraps of mainline with the
following patch on sparc-linux-gnu and sparc64-linux-gnu.
Do you mind if I check in this fix? I would also like to
pursue getting this installed on the gcc-4.2 branch as well,
as I stated I've already done several regstraps of the 4.2
backport of this fix as well.
Thank you.
2007-10-18 Seongbae Park <[EMAIL PROTECTED]>
David S. Miller <[EMAIL PROTECTED]>
* df-scan.c (df_get_call_refs): Mark global registers as both a
DF_REF_REG_USE and a non-clobber DF_REF_REG_DEF.
--- df-scan.c.ORIG 2007-10-18 16:56:19.000000000 -0700
+++ df-scan.c 2007-10-18 16:56:50.000000000 -0700
@@ -3109,18 +3109,22 @@
so they are recorded as used. */
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
if (global_regs[i])
- df_ref_record (collection_rec, regno_reg_rtx[i],
- NULL, bb, insn, DF_REF_REG_USE, flags);
+ {
+ df_ref_record (collection_rec, regno_reg_rtx[i],
+ NULL, bb, insn, DF_REF_REG_USE, flags);
+ df_ref_record (collection_rec, regno_reg_rtx[i],
+ NULL, bb, insn, DF_REF_REG_DEF, flags);
+ }
is_sibling_call = SIBLING_CALL_P (insn);
EXECUTE_IF_SET_IN_BITMAP (df_invalidated_by_call, 0, ui, bi)
{
- if ((!bitmap_bit_p (defs_generated, ui))
+ if (!global_regs[ui]
+ && (!bitmap_bit_p (defs_generated, ui))
&& (!is_sibling_call
|| !bitmap_bit_p (df->exit_block_uses, ui)
|| refers_to_regno_p (ui, ui+1,
current_function_return_rtx, NULL)))
-
df_ref_record (collection_rec, regno_reg_rtx[ui],
NULL, bb, insn, DF_REF_REG_DEF, DF_REF_MAY_CLOBBER |
flags);
}
