* [PATCH][4.9]Backport "Fix register corruption bug in ree"
@ 2015-02-06 17:48 Renlin Li
2015-03-02 14:14 ` [PING][PATCH][4.9]Backport " Renlin Li
0 siblings, 1 reply; 2+ messages in thread
From: Renlin Li @ 2015-02-06 17:48 UTC (permalink / raw)
To: gcc-patches; +Cc: marcus Shawcroft, Jeff Law, ramana Radhakrishnan
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Hi all,
This is a backport patch for branch 4.9. You can find the original patch
here: https://gcc.gnu.org/ml/gcc-patches/2014-09/msg00356.html
And it has been commit on the trunk as r215205.
This fixes a few libstdc++-v3 test suite failures.
x86_64 bootstraps Okay, aarch64_be-none-elf libstdc++-v3 tested Okay.
Okay to commit on branch 4.9?
Regards,
Renlin Li
2015-02-06 Renlin Li <renlin.li@arm.com>
Backport from mainline
2014-09-12 Wilco Dijkstra <wilco.dijkstra@arm.com>
* gcc/ree.c (combine_reaching_defs): Ensure inserted copy don't change
the number of hard registers.
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diff --git a/gcc/ree.c b/gcc/ree.c
index 67fc9c3..e9ff904 100644
--- a/gcc/ree.c
+++ b/gcc/ree.c
@@ -793,6 +793,14 @@ combine_reaching_defs (ext_cand *cand, const_rtx set_pat, ext_state *state)
if (state->modified[INSN_UID (cand->insn)].kind != EXT_MODIFIED_NONE)
return false;
+ enum machine_mode dst_mode = GET_MODE (SET_DEST (PATTERN (cand->insn)));
+ rtx src_reg = get_extended_src_reg (SET_SRC (PATTERN (cand->insn)));
+
+ /* Ensure the number of hard registers of the copy match. */
+ if (HARD_REGNO_NREGS (REGNO (src_reg), dst_mode)
+ != HARD_REGNO_NREGS (REGNO (src_reg), GET_MODE (src_reg)))
+ return false;
+
/* There's only one reaching def. */
rtx def_insn = state->defs_list[0];
@@ -842,7 +850,7 @@ combine_reaching_defs (ext_cand *cand, const_rtx set_pat, ext_state *state)
start_sequence ();
rtx pat = PATTERN (cand->insn);
rtx new_dst = gen_rtx_REG (GET_MODE (SET_DEST (pat)),
- REGNO (XEXP (SET_SRC (pat), 0)));
+ REGNO (get_extended_src_reg (SET_SRC (pat))));
rtx new_src = gen_rtx_REG (GET_MODE (SET_DEST (pat)),
REGNO (SET_DEST (pat)));
emit_move_insn (new_dst, new_src);
^ permalink raw reply [flat|nested] 2+ messages in thread
* [PING][PATCH][4.9]Backport "Fix register corruption bug in ree"
2015-02-06 17:48 [PATCH][4.9]Backport "Fix register corruption bug in ree" Renlin Li
@ 2015-03-02 14:14 ` Renlin Li
0 siblings, 0 replies; 2+ messages in thread
From: Renlin Li @ 2015-03-02 14:14 UTC (permalink / raw)
To: gcc-patches; +Cc: marcus Shawcroft, Jeff Law, ramana Radhakrishnan
Ping~
Anybody has time to review it?
Regards,
Renlin Li
On 06/02/15 17:48, Renlin Li wrote:
> Hi all,
>
> This is a backport patch for branch 4.9. You can find the original
> patch here: https://gcc.gnu.org/ml/gcc-patches/2014-09/msg00356.html
> And it has been commit on the trunk as r215205.
>
> This fixes a few libstdc++-v3 test suite failures.
> x86_64 bootstraps Okay, aarch64_be-none-elf libstdc++-v3 tested Okay.
>
> Okay to commit on branch 4.9?
>
> Regards,
> Renlin Li
>
> 2015-02-06 Renlin Li <renlin.li@arm.com>
>
> Backport from mainline
> 2014-09-12 Wilco Dijkstra <wilco.dijkstra@arm.com>
>
> * gcc/ree.c (combine_reaching_defs): Ensure inserted copy don't
> change
> the number of hard registers.
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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