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From bda19efc40252dff9bf25ec3ca63bb968fb7fa4a Mon Sep 17 00:00:00 2001
From: Claudiu Zissulescu <claziss@gmail.com>
Date: Wed, 16 Jan 2019 13:16:09 +0200
Subject: [PATCH] [ARC] Emit blockage regardless to avoid delay slot
scheduling.
The delay slot scheduler can reschedule some of the frame related
instructions resulting in having incorect CFI information. This patch
introduces a schedule blockage to avoid this problem.
gcc/
xxxx-xx-xx Claudiu Zissulescu <claziss@synopsys.com>
* config/arc/arc.c (arc_expand_prologue): Emit blockage regardless
to avoid delay slot scheduling.
* config/arc/arc.md (stack_tie): Remove.
(UNSPEC_ARC_STKTIE): Likewise.
Upstream status: Pending
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
---
gcc/config/arc/arc.c | 12 ++++--------
gcc/config/arc/arc.md | 13 -------------
2 files changed, 4 insertions(+), 21 deletions(-)
diff --git a/gcc/config/arc/arc.c b/gcc/config/arc/arc.c
index 88b76a2e94b..7b201d3f64c 100644
--- a/gcc/config/arc/arc.c
+++ b/gcc/config/arc/arc.c
@@ -3716,14 +3716,10 @@ arc_expand_prologue (void)
/* Allocate the stack frame. */
if (frame_size_to_allocate > 0)
- {
- frame_stack_add ((HOST_WIDE_INT) 0 - frame_size_to_allocate);
- /* If the frame pointer is needed, emit a special barrier that
- will prevent the scheduler from moving stores to the frame
- before the stack adjustment. */
- if (arc_frame_pointer_needed ())
- emit_insn (gen_stack_tie (stack_pointer_rtx, hard_frame_pointer_rtx));
- }
+ frame_stack_add ((HOST_WIDE_INT) 0 - frame_size_to_allocate);
+
+ /* Emit a blockage to avoid delay slot scheduling. */
+ emit_insn (gen_blockage ());
}
/* Do any necessary cleanup after a function to restore stack, frame,
diff --git a/gcc/config/arc/arc.md b/gcc/config/arc/arc.md
index f2313fc49f2..a3ec6a41ac2 100644
--- a/gcc/config/arc/arc.md
+++ b/gcc/config/arc/arc.md
@@ -136,7 +136,6 @@
UNSPEC_ARC_VMAC2HU
UNSPEC_ARC_VMPY2H
UNSPEC_ARC_VMPY2HU
- UNSPEC_ARC_STKTIE
VUNSPEC_ARC_RTIE
VUNSPEC_ARC_SYNC
@@ -6283,18 +6282,6 @@ core_3, archs4x, archs4xd, archs4xd_slow"
(set_attr "predicable" "yes,no,no,yes,no")
(set_attr "cond" "canuse,nocond,nocond,canuse_limm,nocond")])
-(define_insn "stack_tie"
- [(set (mem:BLK (scratch))
- (unspec:BLK [(match_operand:SI 0 "register_operand" "r")
- (match_operand:SI 1 "register_operand" "r")]
- UNSPEC_ARC_STKTIE))]
- ""
- ""
- [(set_attr "length" "0")
- (set_attr "iscompact" "false")
- (set_attr "type" "block")]
- )
-
(define_insn "*add_shift"
[(set (match_operand:SI 0 "register_operand" "=q,r,r")
(plus:SI (ashift:SI (match_operand:SI 1 "register_operand" "q,r,r")
--
2.16.2
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