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From: Christoph Muellner <christoph.muellner@vrull.eu>
To: gcc-patches@gcc.gnu.org, Kito Cheng <kito.cheng@sifive.com>,
	Jim Wilson <jim.wilson.gcc@gmail.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Andrew Waterman <andrew@sifive.com>,
	Philipp Tomsich <philipp.tomsich@vrull.eu>,
	Jeff Law <jeffreyalaw@gmail.com>,
	Vineet Gupta <vineetg@rivosinc.com>
Subject: [PATCH 1/7] riscv: bitmanip: add orc.b as an unspec
Date: Mon, 14 Nov 2022 00:05:15 +0100	[thread overview]
Message-ID: <20221113230521.712693-2-christoph.muellner@vrull.eu> (raw)
In-Reply-To: <20221113230521.712693-1-christoph.muellner@vrull.eu>

From: Philipp Tomsich <philipp.tomsich@vrull.eu>

As a basis for optimized string functions (e.g., the by-pieces
implementations), we need orc.b available.  This adds orc.b as an
unspec, so we can expand to it.

gcc/ChangeLog:

        * config/riscv/bitmanip.md (orcb<mode>2): Add orc.b as an
	  unspec.
        * config/riscv/riscv.md: Add UNSPEC_ORC_B.

Signed-off-by: Philipp Tomsich <philipp.tomsich@vrull.eu>
---
 gcc/config/riscv/bitmanip.md | 8 ++++++++
 gcc/config/riscv/riscv.md    | 3 +++
 2 files changed, 11 insertions(+)

diff --git a/gcc/config/riscv/bitmanip.md b/gcc/config/riscv/bitmanip.md
index b44fb9517e7..3dbe6002974 100644
--- a/gcc/config/riscv/bitmanip.md
+++ b/gcc/config/riscv/bitmanip.md
@@ -242,6 +242,14 @@ (define_insn "rotlsi3_sext"
   "rolw\t%0,%1,%2"
   [(set_attr "type" "bitmanip")])
 
+;; orc.b (or-combine) is added as an unspec for the benefit of the support
+;; for optimized string functions (such as strcmp).
+(define_insn "orcb<mode>2"
+  [(set (match_operand:X 0 "register_operand" "=r")
+	(unspec:X [(match_operand:X 1 "register_operand" "r")] UNSPEC_ORC_B))]
+  "TARGET_ZBB"
+  "orc.b\t%0,%1")
+
 (define_insn "bswap<mode>2"
   [(set (match_operand:X 0 "register_operand" "=r")
         (bswap:X (match_operand:X 1 "register_operand" "r")))]
diff --git a/gcc/config/riscv/riscv.md b/gcc/config/riscv/riscv.md
index 798f7370a08..532289dd178 100644
--- a/gcc/config/riscv/riscv.md
+++ b/gcc/config/riscv/riscv.md
@@ -62,6 +62,9 @@ (define_c_enum "unspec" [
 
   ;; Stack tie
   UNSPEC_TIE
+
+  ;; OR-COMBINE
+  UNSPEC_ORC_B
 ])
 
 (define_c_enum "unspecv" [
-- 
2.38.1


  reply	other threads:[~2022-11-13 23:05 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-13 23:05 [PATCH 0/7] riscv: Improve builtins expansion Christoph Muellner
2022-11-13 23:05 ` Christoph Muellner [this message]
2022-11-14 16:51   ` [PATCH 1/7] riscv: bitmanip: add orc.b as an unspec Jeff Law
2022-11-14 17:53     ` Jeff Law
2022-11-14 19:05     ` Philipp Tomsich
2022-11-13 23:05 ` [PATCH 2/7] riscv: bitmanip/zbb: Add prefix/postfix and enable visiblity Christoph Muellner
2022-11-14 16:55   ` Jeff Law
2022-11-13 23:05 ` [PATCH 3/7] riscv: Enable overlap-by-pieces via tune param Christoph Muellner
2022-11-14  2:48   ` Vineet Gupta
2022-11-14  7:59     ` Philipp Tomsich
2022-11-14  8:29       ` Christoph Müllner
2022-11-14 19:04         ` Jeff Law
2022-11-14 19:07           ` Christoph Müllner
2022-11-13 23:05 ` [PATCH 4/7] riscv: Move riscv_block_move_loop to separate file Christoph Muellner
2022-11-14 16:56   ` Jeff Law
2022-11-13 23:05 ` [PATCH 5/7] riscv: Use by-pieces to do overlapping accesses in block_move_straight Christoph Muellner
2022-11-14 17:16   ` Jeff Law
2022-11-14 19:01     ` Christoph Müllner
2022-11-14 19:05       ` Jeff Law
2022-11-13 23:05 ` [PATCH 6/7] riscv: Add support for strlen inline expansion Christoph Muellner
2022-11-14 18:17   ` Jeff Law
2022-11-14 21:07     ` Christoph Müllner
2022-11-13 23:05 ` [PATCH 7/7] riscv: Add support for str(n)cmp " Christoph Muellner
2022-11-14 19:28   ` Jeff Law
2022-11-14 21:49     ` Christoph Müllner
2022-11-15  0:22       ` Jeff Law
2022-11-15  0:46   ` Kito Cheng
2022-11-15  0:53     ` Palmer Dabbelt
2022-11-15  1:55       ` Kito Cheng
2022-11-15  3:41       ` Jeff Law
2022-11-15 22:22     ` Christoph Müllner
2022-11-16  0:15     ` Philipp Tomsich
2022-11-21  3:24       ` Kito Cheng

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