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* [gcc r13-4032] riscv: bitmanip: add orc.b as an unspec
@ 2022-11-14 19:04 Philipp Tomsich
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From: Philipp Tomsich @ 2022-11-14 19:04 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:eab3d2d17dd8fedc856cf175a3f2174770ecb64d
commit r13-4032-geab3d2d17dd8fedc856cf175a3f2174770ecb64d
Author: Philipp Tomsich <philipp.tomsich@vrull.eu>
Date: Thu May 27 17:20:05 2021 +0200
riscv: bitmanip: add orc.b as an unspec
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>
Diff:
---
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 d26f3567182..48c249f2a68 100644
--- a/gcc/config/riscv/bitmanip.md
+++ b/gcc/config/riscv/bitmanip.md
@@ -255,6 +255,14 @@
"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 @@
;; Stack tie
UNSPEC_TIE
+
+ ;; OR-COMBINE
+ UNSPEC_ORC_B
])
(define_c_enum "unspecv" [
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