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Tighten up checks when tying chains.

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gcc/
	* regname.c (scan_rtx_reg): Check the matching number of consecutive
	registers when tying chains.
	(build_def_use): Move terminated_this_insn earlier in the function.

From-SVN: r230149
This commit is contained in:
Robert Suchanek 2015-11-11 10:36:00 +00:00 • committed by Robert Suchanek
parent 6eef39f15b
commit 394b24ea80
2 changed files with 10 additions and 3 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2015-11-11 Robert Suchanek <robert.suchanek@imgtec.com>
* regname.c (scan_rtx_reg): Check the matching number of consecutive
registers when tying chains.
(build_def_use): Move terminated_this_insn earlier in the function.
2015-11-10 Mike Frysinger <vapier@gentoo.org>
* configure.ac: Use = with test and not ==.

7
gcc/regrename.c
View file

@ -1068,7 +1068,9 @@ scan_rtx_reg (rtx_insn *insn, rtx *loc, enum reg_class cl, enum scan_actions act
&& GET_CODE (pat) == SET
&& GET_CODE (SET_DEST (pat)) == REG
&& GET_CODE (SET_SRC (pat)) == REG
&& terminated_this_insn)
&& terminated_this_insn
&& terminated_this_insn->nregs
== REG_NREGS (recog_data.operand[1]))
{
gcc_assert (terminated_this_insn->regno
== REGNO (recog_data.operand[1]));
@ -1593,6 +1595,7 @@ build_def_use (basic_block bb)
enum rtx_code set_code = SET;
enum rtx_code clobber_code = CLOBBER;
insn_rr_info *insn_info = NULL;
terminated_this_insn = NULL;
/* Process the insn, determining its effect on the def-use
chains and live hard registers. We perform the following
@ -1749,8 +1752,6 @@ build_def_use (basic_block bb)
scan_rtx (insn, &XEXP (note, 0), ALL_REGS, mark_read,
OP_INOUT);
terminated_this_insn = NULL;
/* Step 4: Close chains for registers that die here, unless
the register is mentioned in a REG_UNUSED note. In that
case we keep the chain open until step #7 below to ensure