From: "Maciej W. Rozycki" <macro@linux-mips.org>
To: gcc-patches@gcc.gnu.org
Cc: Jeff Law <law@redhat.com>, Anders Magnusson <ragge@tethuvudet.se>,
Paul Koning <ni1d@arrl.net>, Matt Thomas <matt@3am-software.com>
Subject: [PATCH 08/31] jump: Also handle jumps wrapped in UNSPEC or UNSPEC_VOLATILE
Date: Fri, 20 Nov 2020 03:34:47 +0000 (GMT) [thread overview]
Message-ID: <alpine.LFD.2.21.2011200244300.656242@eddie.linux-mips.org> (raw)
In-Reply-To: <alpine.LFD.2.21.2010251020560.866917@eddie.linux-mips.org>
VAX has interlocked branch instructions used for atomic operations and
we want to have them wrapped in UNSPEC_VOLATILE so as not to have code
carried across. This however breaks with jump optimization and leads
to an ICE in the build of libbacktrace like:
.../libbacktrace/mmap.c:190:1: internal compiler error: in fixup_reorder_chain, at cfgrtl.c:3934
190 | }
| ^
0x1087d46b fixup_reorder_chain
.../gcc/cfgrtl.c:3934
0x1087f29f cfg_layout_finalize()
.../gcc/cfgrtl.c:4447
0x1087c74f execute
.../gcc/cfgrtl.c:3662
on RTL like:
(jump_insn 18 17 150 4 (unspec_volatile [
(set (pc)
(if_then_else (eq (zero_extract:SI (mem/v:SI (reg/f:SI 23 [ _2 ]) [-1 S4 A32])
(const_int 1 [0x1])
(const_int 0 [0]))
(const_int 1 [0x1]))
(label_ref 20)
(pc)))
(set (zero_extract:SI (mem/v:SI (reg/f:SI 23 [ _2 ]) [-1 S4 A32])
(const_int 1 [0x1])
(const_int 0 [0]))
(const_int 1 [0x1]))
] 101) ".../libbacktrace/mmap.c":135:14 158 {jbbssisi}
(nil)
-> 20)
when those branches are enabled with a follow-up change. Also showing
with:
FAIL: gcc.dg/pr61756.c (internal compiler error)
Handle branches wrapped in UNSPEC_VOLATILE then and, for consistency,
also in UNSPEC. The presence of UNSPEC_VOLATILE will prevent such
branches from being removed as they won't be accepted by `onlyjump_p',
we just need to let them through.
gcc/
* jump.c (pc_set): Also accept a jump wrapped in UNSPEC or
UNSPEC_VOLATILE.
(any_uncondjump_p, any_condjump_p): Update comment accordingly.
---
gcc/jump.c | 22 +++++++++++++++-------
1 file changed, 15 insertions(+), 7 deletions(-)
diff --git a/gcc/jump.c b/gcc/jump.c
index 34a8f209e20..f4c735540f0 100644
--- a/gcc/jump.c
+++ b/gcc/jump.c
@@ -850,9 +850,17 @@ pc_set (const rtx_insn *insn)
pat = PATTERN (insn);
/* The set is allowed to appear either as the insn pattern or
- the first set in a PARALLEL. */
- if (GET_CODE (pat) == PARALLEL)
- pat = XVECEXP (pat, 0, 0);
+ the first set in a PARALLEL, UNSPEC or UNSPEC_VOLATILE. */
+ switch (GET_CODE (pat))
+ {
+ case PARALLEL:
+ case UNSPEC:
+ case UNSPEC_VOLATILE:
+ pat = XVECEXP (pat, 0, 0);
+ break;
+ default:
+ break;
+ }
if (GET_CODE (pat) == SET && GET_CODE (SET_DEST (pat)) == PC)
return pat;
@@ -860,7 +868,7 @@ pc_set (const rtx_insn *insn)
}
/* Return true when insn is an unconditional direct jump,
- possibly bundled inside a PARALLEL. */
+ possibly bundled inside a PARALLEL, UNSPEC or UNSPEC_VOLATILE. */
int
any_uncondjump_p (const rtx_insn *insn)
@@ -876,9 +884,9 @@ any_uncondjump_p (const rtx_insn *insn)
}
/* Return true when insn is a conditional jump. This function works for
- instructions containing PC sets in PARALLELs. The instruction may have
- various other effects so before removing the jump you must verify
- onlyjump_p.
+ instructions containing PC sets in PARALLELs, UNSPECs or UNSPEC_VOLATILEs.
+ The instruction may have various other effects so before removing the jump
+ you must verify onlyjump_p.
Note that unlike condjump_p it returns false for unconditional jumps. */
--
2.11.0
next prev parent reply other threads:[~2020-11-20 3:34 UTC|newest]
Thread overview: 117+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-20 3:38 [PATCH 00/31] VAX: Bring the port up to date (yes, MODE_CC conversion is included) Maciej W. Rozycki
2020-11-20 3:34 ` [PATCH 01/31] PR target/58901: reload: Handle SUBREG of MEM with a mode-dependent address Maciej W. Rozycki
2020-11-20 10:55 ` Eric Botcazou
2020-11-20 15:30 ` Maciej W. Rozycki
2020-11-24 6:19 ` [PATCH v2 " Maciej W. Rozycki
2020-11-24 11:03 ` Eric Botcazou
2020-11-26 17:22 ` Maciej W. Rozycki
2020-11-27 3:51 ` Maciej W. Rozycki
2020-11-27 10:52 ` Ulrich Weigand
2020-11-27 19:22 ` Maciej W. Rozycki
2020-11-27 20:47 ` Maciej W. Rozycki
2020-11-27 20:50 ` [PATCH v3 " Maciej W. Rozycki
2020-11-30 18:51 ` Jeff Law
2020-11-29 17:31 ` [PATCH v2 " Jeff Law
2020-11-20 3:34 ` [PATCH 02/31] VAX: Remove `c' operand format specifier overload Maciej W. Rozycki
2020-11-20 23:16 ` Jeff Law
2020-11-24 1:12 ` Segher Boessenkool
2020-11-20 3:34 ` [PATCH 03/31] VAX: Define LEGITIMATE_PIC_OPERAND_P Maciej W. Rozycki
2020-11-21 3:17 ` Jeff Law
2020-11-20 3:34 ` [PATCH 04/31] VAX/testsuite: Run target testing over all the usual optimization levels Maciej W. Rozycki
2020-11-20 23:17 ` Jeff Law
2020-11-20 3:34 ` [PATCH 05/31] VAX: Rationalize expression and address costs Maciej W. Rozycki
2020-11-21 3:48 ` Jeff Law
2020-11-20 3:34 ` [PATCH 06/31] VAX: Correct fatal issues with the `ffs' builtin Maciej W. Rozycki
2020-11-20 23:19 ` Jeff Law
2020-11-20 3:34 ` [PATCH 07/31] RTL: Also support HOST_WIDE_INT with int iterators Maciej W. Rozycki
2020-11-21 4:19 ` Jeff Law
2020-11-20 3:34 ` Maciej W. Rozycki [this message]
2020-11-21 4:25 ` [PATCH 08/31] jump: Also handle jumps wrapped in UNSPEC or UNSPEC_VOLATILE Jeff Law
2020-12-03 3:50 ` [PATCH v2 " Maciej W. Rozycki
2020-12-03 22:20 ` Jeff Law
2020-11-20 3:34 ` [PATCH 09/31] VAX: Use a mode iterator to produce individual interlocked branches Maciej W. Rozycki
2020-11-20 23:20 ` Jeff Law
2020-11-20 3:34 ` [PATCH 10/31] VAX: Use an int " Maciej W. Rozycki
2020-11-20 23:20 ` Jeff Law
2020-11-20 3:35 ` [PATCH 11/31] VAX: Correct `sync_lock_test_and_set' and `sync_lock_release' builtins Maciej W. Rozycki
2020-11-21 4:26 ` Jeff Law
2020-11-20 3:35 ` [PATCH 12/31] VAX: Actually enable `builtins.md' now that it is fully functional Maciej W. Rozycki
2020-11-20 23:21 ` Jeff Law
2020-11-20 3:35 ` [PATCH 13/31] VAX: Add a test for the SImode `ffs' operation Maciej W. Rozycki
2020-11-20 23:22 ` Jeff Law
2020-11-20 3:35 ` [PATCH 14/31] VAX: Add tests for `sync_lock_test_and_set' and `sync_lock_release' Maciej W. Rozycki
2020-11-20 23:22 ` Jeff Law
2020-11-20 3:35 ` [PATCH 15/31] VAX: Provide the `ctz' operation Maciej W. Rozycki
2020-11-20 23:23 ` Jeff Law
2020-11-20 3:35 ` [PATCH 16/31] VAX: Also provide QImode and HImode `ctz' and `ffs' operations Maciej W. Rozycki
2020-11-20 23:24 ` Jeff Law
2020-11-20 3:35 ` [PATCH 17/31] VAX: Actually produce QImode and HImode `ctz' operations Maciej W. Rozycki
2020-11-20 23:24 ` Jeff Law
2020-11-20 3:35 ` [PATCH 18/31] VAX: Add a test for the `cpymemhi' instruction Maciej W. Rozycki
2020-11-20 23:25 ` Jeff Law
2020-11-20 3:35 ` [PATCH 19/31] VAX: Add the `movmemhi' instruction Maciej W. Rozycki
2020-11-20 23:25 ` Jeff Law
2020-11-20 3:35 ` [PATCH 20/31] VAX: Fix predicates and constraints for EXTV/EXTZV/INSV insns Maciej W. Rozycki
2020-11-21 17:01 ` Jeff Law
2020-11-20 3:35 ` [PATCH 21/31] VAX: Remove EXTV/EXTZV/INSV instruction use from aligned case insns Maciej W. Rozycki
2020-11-21 17:25 ` Jeff Law
2020-11-20 3:35 ` [PATCH 22/31] VAX: Ensure PIC mode address is adjustable with aligned bitfield insns Maciej W. Rozycki
2020-11-21 17:03 ` Jeff Law
2020-11-20 3:36 ` [PATCH 23/31] VAX: Make `extv' an expander matching the remaining bitfield operations Maciej W. Rozycki
2020-11-21 17:26 ` Jeff Law
2020-11-20 3:36 ` [PATCH 24/31] VAX: Fix predicates and constraints for bitfield comparison insns Maciej W. Rozycki
2020-11-21 17:27 ` Jeff Law
2020-11-20 3:36 ` [PATCH 25/31] VAX: Fix predicates for widening multiply and multiply-add insns Maciej W. Rozycki
2020-11-21 4:05 ` Jeff Law
2020-11-30 16:02 ` Maciej W. Rozycki
2020-11-30 18:29 ` Jeff Law
2020-11-20 3:36 ` [PATCH 26/31] VAX: Correct issues with commented-out insns Maciej W. Rozycki
2020-11-21 4:05 ` Jeff Law
2020-11-20 3:36 ` [PATCH 27/31] VAX: Make the `divmoddisi4' and `*amulsi4' comment notation consistent Maciej W. Rozycki
2020-11-21 4:06 ` Jeff Law
2020-11-24 1:37 ` Segher Boessenkool
2020-11-20 3:36 ` [PATCH 28/31] RTL: Add `const_double_zero' syntactic rtx Maciej W. Rozycki
2020-11-21 17:29 ` Jeff Law
2020-11-20 3:36 ` [PATCH 29/31] PDP11: Use `const_double_zero' to express double zero constant Maciej W. Rozycki
2020-11-21 4:07 ` Jeff Law
2020-12-15 8:26 ` Martin Liška
2020-12-15 14:06 ` Maciej W. Rozycki
2020-12-15 18:02 ` Paul Koning
2020-12-15 18:38 ` Maciej W. Rozycki
2020-11-20 3:36 ` [PATCH 30/31] PR target/95294: VAX: Convert backend to MODE_CC representation Maciej W. Rozycki
2020-11-22 3:27 ` Jeff Law
2020-12-09 16:09 ` Maciej W. Rozycki
2020-11-20 3:37 ` [PATCH 31/31] PR target/95294: VAX: Add test cases for " Maciej W. Rozycki
2020-11-21 4:08 ` Jeff Law
2020-12-05 18:40 ` Maciej W. Rozycki
2020-11-20 7:58 ` [PATCH 00/31] VAX: Bring the port up to date (yes, MODE_CC conversion is included) Anders Magnusson
2020-11-23 20:31 ` Maciej W. Rozycki
2020-11-21 21:02 ` Toon Moene
2020-11-23 21:51 ` Maciej W. Rozycki
2020-11-23 22:12 ` Thomas Koenig
2020-11-24 4:28 ` Maciej W. Rozycki
2020-11-24 5:27 ` Maciej W. Rozycki
2020-11-24 6:04 ` Maciej W. Rozycki
2020-11-24 6:16 ` Thomas Koenig
2020-11-25 19:22 ` Maciej W. Rozycki
2020-11-25 18:26 ` Maciej W. Rozycki
2020-11-25 22:20 ` Joseph Myers
2020-11-26 18:01 ` Maciej W. Rozycki
2020-11-26 18:08 ` Martin Husemann
2020-12-08 14:38 ` Maciej W. Rozycki
2020-12-08 15:22 ` Martin Husemann
2020-11-25 22:26 ` coypu
2020-11-26 17:59 ` Maciej W. Rozycki
2020-11-26 19:35 ` Maciej W. Rozycki
2020-11-23 15:48 ` Paul Koning
2020-11-25 17:07 ` Maciej W. Rozycki
2020-11-28 18:48 ` Paul Koning
2020-12-09 14:06 ` Maciej W. Rozycki
2020-12-10 1:33 ` Paul Koning
2020-12-11 14:54 ` Maciej W. Rozycki
2020-12-11 21:50 ` Paul Koning
2020-11-25 18:36 ` Maciej W. Rozycki
2020-11-26 14:46 ` Ian Lance Taylor
2020-11-26 18:07 ` Maciej W. Rozycki
2020-11-29 17:56 ` Martin Sebor
2020-12-07 14:25 ` Maciej W. Rozycki
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