From: Richard Sandiford <richard.sandiford@arm.com>
To: gcc-patches@gcc.gnu.org
Subject: [20/23] rtlanal: Add simple_regno_set
Date: Fri, 13 Nov 2020 08:21:27 +0000 [thread overview]
Message-ID: <mptwnyp6514.fsf@arm.com> (raw)
In-Reply-To: <mpth7ptad81.fsf@arm.com> (Richard Sandiford's message of "Fri, 13 Nov 2020 08:10:54 +0000")
This patch adds a routine for finding a “simple” SET for a register
definition. See the comment in the patch for details.
gcc/
* rtl.h (simple_regno_set): Declare.
* rtlanal.c (simple_regno_set): New function.
---
gcc/rtl.h | 1 +
gcc/rtlanal.c | 33 +++++++++++++++++++++++++++++++++
2 files changed, 34 insertions(+)
diff --git a/gcc/rtl.h b/gcc/rtl.h
index e9df95b02c4..3915fae61e7 100644
--- a/gcc/rtl.h
+++ b/gcc/rtl.h
@@ -3539,6 +3539,7 @@ extern void set_insn_deleted (rtx_insn *);
/* Functions in rtlanal.c */
extern rtx single_set_2 (const rtx_insn *, const_rtx);
+extern rtx simple_regno_set (rtx, unsigned int);
extern bool contains_symbol_ref_p (const_rtx);
extern bool contains_symbolic_reference_p (const_rtx);
extern bool contains_constant_pool_address_p (const_rtx);
diff --git a/gcc/rtlanal.c b/gcc/rtlanal.c
index 404813b7668..80e72d6049d 100644
--- a/gcc/rtlanal.c
+++ b/gcc/rtlanal.c
@@ -1455,6 +1455,39 @@ set_of (const_rtx pat, const_rtx insn)
return data.found;
}
+/* Check whether instruction pattern PAT contains a SET with the following
+ properties:
+
+ - the SET is executed unconditionally;
+ - the destination of the SET is write-only rather than read-write; and
+ - either:
+ - the destination of the SET is a REG that contains REGNO; or
+ - the destination of the SET is a SUBREG of such a REG.
+
+ If PAT does have a SET like that, return the set, otherwise return null.
+
+ This is intended to be an alternative to single_set for passes that
+ can handle patterns with multiple_sets. */
+rtx
+simple_regno_set (rtx pat, unsigned int regno)
+{
+ if (GET_CODE (pat) == PARALLEL)
+ {
+ int last = XVECLEN (pat, 0) - 1;
+ for (int i = 0; i < last; ++i)
+ if (rtx set = simple_regno_set (XVECEXP (pat, 0, i), regno))
+ return set;
+
+ pat = XVECEXP (pat, 0, last);
+ }
+
+ if (GET_CODE (pat) == SET
+ && covers_regno_no_parallel_p (SET_DEST (pat), regno))
+ return pat;
+
+ return nullptr;
+}
+
/* Add all hard register in X to *PSET. */
void
find_all_hard_regs (const_rtx x, HARD_REG_SET *pset)
--
2.17.1
next prev parent reply other threads:[~2020-11-13 8:21 UTC|newest]
Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-13 8:10 [00/23] Make fwprop use an on-the-side RTL SSA representation Richard Sandiford
2020-11-13 8:11 ` [01/23] vec: Silence clang warning Richard Sandiford
2020-11-25 19:58 ` Jeff Law
2020-11-13 8:12 ` [02/23] rtlanal: Remove noop_move_p REG_EQUAL condition Richard Sandiford
2020-11-25 20:00 ` Jeff Law
2020-11-13 8:12 ` [03/23] reginfo: Add a global_reg_set Richard Sandiford
2020-11-25 20:01 ` Jeff Law
2020-11-13 8:13 ` [04/23] Move iterator_range to a new iterator-utils.h file Richard Sandiford
2020-11-25 20:02 ` Jeff Law
2020-11-13 8:13 ` [05/23] Add more iterator utilities Richard Sandiford
2020-11-25 20:12 ` Jeff Law
2020-11-13 8:14 ` [06/23] Add an RAII class for managing obstacks Richard Sandiford
2020-11-25 20:15 ` Jeff Law
2020-11-13 8:14 ` [07/23] Add a class that multiplexes two pointer types Richard Sandiford
2020-11-25 20:23 ` Jeff Law
2020-11-26 16:15 ` Richard Sandiford
2020-11-30 1:28 ` Jeff Law
2020-11-25 23:33 ` Martin Sebor
2020-11-26 17:06 ` Richard Sandiford
2020-11-27 18:12 ` Richard Sandiford
2020-11-28 0:17 ` Martin Sebor
2020-12-17 0:17 ` Richard Sandiford
2020-12-17 14:21 ` Tom Tromey
2020-12-17 15:38 ` Richard Sandiford
2020-12-17 15:44 ` Nathan Sidwell
2021-01-04 15:32 ` Jeff Law
2020-11-13 8:15 ` [08/23] Add an alternative splay tree implementation Richard Sandiford
2020-12-02 20:36 ` Jeff Law
2020-12-17 0:29 ` Richard Sandiford
2021-01-04 15:27 ` Jeff Law
2021-01-01 8:25 ` Andreas Schwab
2021-01-04 14:53 ` Richard Sandiford
2021-01-04 15:02 ` Andreas Schwab
2021-01-04 15:42 ` Richard Sandiford
2021-01-05 12:13 ` Richard Biener
2020-11-13 8:15 ` [09/23] Add a cut-down version of std::span (array_slice) Richard Sandiford
2020-11-30 19:56 ` Jeff Law
2022-08-03 15:13 ` Martin Jambor
2022-08-03 15:31 ` Richard Sandiford
2022-08-10 16:03 ` Martin Jambor
2022-08-11 6:58 ` Richard Biener
2022-08-16 7:59 ` Richard Sandiford
2020-11-13 8:16 ` [10/23] Tweak the way that is_a is implemented Richard Sandiford
2020-12-02 5:15 ` Jeff Law
2020-11-13 8:16 ` [11/23] Split update_cfg_for_uncondjump out of combine Richard Sandiford
2020-11-30 6:14 ` Jeff Law
2020-11-13 8:17 ` [12/23] Export print-rtl.c:print_insn_with_notes Richard Sandiford
2020-11-25 20:24 ` Jeff Law
2020-11-13 8:18 ` [13/23] recog: Split out a register_asm_p function Richard Sandiford
2020-11-25 20:24 ` Jeff Law
2020-11-13 8:18 ` [14/23] simplify-rtx: Put simplify routines into a class Richard Sandiford
2020-11-30 19:54 ` Jeff Law
2020-11-13 8:19 ` [15/23] recog: Add a validate_change_xveclen function Richard Sandiford
2020-11-30 20:03 ` Jeff Law
2020-11-13 8:19 ` [16/23] recog: Add a way of temporarily undoing changes Richard Sandiford
2020-11-25 20:27 ` Jeff Law
2020-12-17 0:22 ` Richard Sandiford
2020-11-13 8:20 ` [17/23] recog: Add a class for propagating into insns Richard Sandiford
2020-12-03 22:32 ` Jeff Law
2020-11-13 8:20 ` [18/23] recog: Add an RAII class for undoing insn changes Richard Sandiford
2020-11-25 20:27 ` Jeff Law
2020-11-13 8:20 ` [19/23] rtlanal: Add some new helper classes Richard Sandiford
2020-12-13 17:30 ` Jeff Law
2020-12-14 16:37 ` Richard Sandiford
2020-12-14 20:02 ` Jeff Law
2020-11-13 8:21 ` Richard Sandiford [this message]
2020-11-25 20:31 ` [20/23] rtlanal: Add simple_regno_set Jeff Law
2020-12-17 0:47 ` Richard Sandiford
2021-01-04 15:28 ` Jeff Law
2020-11-13 8:22 ` [21/23] doc: Add documentation for rtl-ssa Richard Sandiford
2020-11-30 6:26 ` Jeff Law
2020-11-13 8:23 ` [PATCH 22/23] Add rtl-ssa Richard Sandiford
2020-12-16 3:31 ` Jeff Law
2020-12-17 0:33 ` Richard Sandiford
2020-12-19 20:01 ` Jeff Law
2020-11-13 8:24 ` [PATCH 23/23] fwprop: Rewrite to use RTL SSA Richard Sandiford
2020-12-16 3:52 ` Jeff Law
2020-12-17 0:34 ` Richard Sandiford
2020-11-25 19:58 ` [00/23] Make fwprop use an on-the-side RTL SSA representation Jeff Law
2020-11-26 16:03 ` Richard Sandiford
2020-11-27 15:56 ` Michael Matz
2020-11-27 16:31 ` Richard Sandiford
2020-11-30 21:13 ` Jeff Law
2020-12-01 0:03 ` Michael Matz
2020-12-01 10:15 ` Richard Sandiford
2020-12-02 0:25 ` Jeff Law
2020-11-30 6:45 ` Jeff Law
2020-11-30 14:12 ` Richard Sandiford
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