From: Takayuki 'January June' Suwa <jjsuwa_sys3175@yahoo.co.jp>
To: GCC Patches <gcc-patches@gcc.gnu.org>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Subject: [PATCH 2/2] xtensa: Optimize ctzsi2 and ffssi2 a bit
Date: Thu, 12 Jan 2023 13:26:42 +0900 [thread overview]
Message-ID: <bf7f5873-6959-9ca5-5a2f-83499ac78034@yahoo.co.jp> (raw)
In-Reply-To: <bf7f5873-6959-9ca5-5a2f-83499ac78034.ref@yahoo.co.jp>
This patch saves one byte when the Code Density Option is enabled,
gcc/ChangeLog:
* config/xtensa/xtensa.md (ctzsi2, ffssi2):
Rearrange the emitting codes.
---
gcc/config/xtensa/xtensa.md | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/gcc/config/xtensa/xtensa.md b/gcc/config/xtensa/xtensa.md
index b4989832169..764da63f91c 100644
--- a/gcc/config/xtensa/xtensa.md
+++ b/gcc/config/xtensa/xtensa.md
@@ -477,8 +477,8 @@
emit_insn (gen_negsi2 (temp, operands[1]));
emit_insn (gen_andsi3 (temp, temp, operands[1]));
emit_insn (gen_clzsi2 (temp, temp));
- emit_insn (gen_negsi2 (temp, temp));
- emit_insn (gen_addsi3 (operands[0], temp, GEN_INT (31)));
+ emit_move_insn (operands[0], GEN_INT (31));
+ emit_insn (gen_subsi3 (operands[0], operands[0], temp));
DONE;
})
@@ -491,8 +491,8 @@
emit_insn (gen_negsi2 (temp, operands[1]));
emit_insn (gen_andsi3 (temp, temp, operands[1]));
emit_insn (gen_clzsi2 (temp, temp));
- emit_insn (gen_negsi2 (temp, temp));
- emit_insn (gen_addsi3 (operands[0], temp, GEN_INT (32)));
+ emit_move_insn (operands[0], GEN_INT (32));
+ emit_insn (gen_subsi3 (operands[0], operands[0], temp));
DONE;
})
--
2.30.2
next parent reply other threads:[~2023-01-12 4:26 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bf7f5873-6959-9ca5-5a2f-83499ac78034.ref@yahoo.co.jp>
2023-01-12 4:26 ` Takayuki 'January June' Suwa [this message]
2023-01-12 12:46 ` Max Filippov
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