linux-kernel - [PATCH 1/1] riscv: Enable compiler optimizations

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Message-Id: <20200708054354.25283-1-maochenxi@eswin.com>
Date:   Wed,  8 Jul 2020 13:43:54 +0800
From:   Chenxi Mao <maochenxi@...in.com>
To:     paul.walmsley@...ive.com, palmer@...belt.com, aou@...s.berkeley.edu
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        chenxi.mao2013@...il.com, Chenxi Mao <maochenxi@...in.com>
Subject: [PATCH 1/1] riscv: Enable compiler optimizations

Enable ARCH_HAS_FAST_MULTIPLIER and ARCH_SUPPORTS_INT128 for better
code generation.
These 2 configurations works fine on GCC-9.3 and GCC-10.1

Signed-off-by: Chenxi Mao <maochenxi@...in.com>
---
 arch/riscv/Kconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 128192e14ff2..f21b7e5188ca 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -26,6 +26,8 @@ config RISCV
 	select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
 	select ARCH_WANT_FRAME_POINTERS
 	select ARCH_WANT_HUGE_PMD_SHARE if 64BIT
+	select ARCH_HAS_FAST_MULTIPLIER
+	select ARCH_SUPPORTS_INT128 if GCC_VERSION >= 50000 || CC_IS_CLANG
 	select CLONE_BACKWARDS
 	select COMMON_CLK
 	select EDAC_SUPPORT
-- 
2.25.1