From: Charlie Jenkins <charlie@rivosinc.com>
To: Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
Charlie Jenkins <charlie@rivosinc.com>
Subject: [PATCH v2] riscv: lib: Check if output in asm goto supported
Date: Thu, 18 Jan 2024 14:36:45 -0800 [thread overview]
Message-ID: <20240118-csum_remove_output_operands_asm_goto-v2-1-5d1b73cf93d4@rivosinc.com> (raw)
The output field of an asm goto statement is not supported by all
compilers. If it is not supported, fallback to the non-optimized code.
Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
Fixes: a04c192eabfb ("riscv: Add checksum library")
---
The OutputOperands field for asm goto statements is only supported
starting from GCC 11. Split the asm goto to remove the use of this
feature.
---
Changes in v2:
- Use CC_HAS_ASM_GOTO_TIED_OUTPUT
- Link to v1: https://lore.kernel.org/r/20240118-csum_remove_output_operands_asm_goto-v1-1-47c672bb9d4b@rivosinc.com
---
arch/riscv/lib/csum.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/riscv/lib/csum.c b/arch/riscv/lib/csum.c
index 06ce8e7250d9..af3df5274ccb 100644
--- a/arch/riscv/lib/csum.c
+++ b/arch/riscv/lib/csum.c
@@ -156,6 +156,7 @@ do_csum_with_alignment(const unsigned char *buff, int len)
end = (const unsigned long *)(buff + len);
csum = do_csum_common(ptr, end, data);
+#ifdef CC_HAS_ASM_GOTO_TIED_OUTPUT
/*
* Zbb support saves 6 instructions, so not worth checking without
* alternatives if supported
@@ -214,6 +215,7 @@ do_csum_with_alignment(const unsigned char *buff, int len)
return csum >> 16;
}
no_zbb:
+#endif /* CC_HAS_ASM_GOTO_TIED_OUTPUT */
#ifndef CONFIG_32BIT
csum += ror64(csum, 32);
csum >>= 32;
---
base-commit: 080c4324fa5e81ff3780206a138223abfb57a68e
change-id: 20240118-csum_remove_output_operands_asm_goto-49922c141ce7
--
- Charlie
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next reply other threads:[~2024-01-18 22:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-18 22:36 Charlie Jenkins [this message]
2024-01-19 9:41 ` [PATCH v2] riscv: lib: Check if output in asm goto supported Andrew Jones
2024-01-19 15:23 ` Charlie Jenkins
2024-01-20 21:09 ` patchwork-bot+linux-riscv
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