linux-kernel - [PATCH] LoongArch: Select ARCH_SUPPORTS_INT128 if CC_HAS

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Date: Thu, 28 Mar 2024 01:17:37 +0800
From: Xi Ruoyao <xry111@...111.site>
To: Huacai Chen <chenhuacai@...nel.org>,
	WANG Xuerui <kernel@...0n.name>
Cc: loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Tiezhu Yang <yangtiezhu@...ngson.cn>,
	Xi Ruoyao <xry111@...111.site>
Subject: [PATCH] LoongArch: Select ARCH_SUPPORTS_INT128 if CC_HAS_INT128

This allows compiling a full 128-bit product of two 64-bit integers as
a mul/mulh pair, instead of a nasty long sequence of 20+ instructions.

Signed-off-by: Xi Ruoyao <xry111@...111.site>
---
 arch/loongarch/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index a5f300ec6f28..5a769bb92d7c 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -56,6 +56,7 @@ config LOONGARCH
 	select ARCH_SUPPORTS_ACPI
 	select ARCH_SUPPORTS_ATOMIC_RMW
 	select ARCH_SUPPORTS_HUGETLBFS
+	select ARCH_SUPPORTS_INT128 if CC_HAS_INT128
 	select ARCH_SUPPORTS_LTO_CLANG
 	select ARCH_SUPPORTS_LTO_CLANG_THIN
 	select ARCH_SUPPORTS_NUMA_BALANCING
-- 
2.44.0