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| author | Charlie Jenkins <charlie@rivosinc.com> | 2024-01-18 14:36:45 -0800 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2024-01-18 14:41:38 -0800 |
| commit | 4525462dd0db9e86bb67c10dedbbaa4f8d62697d (patch) | |
| tree | f089c531e3c91a419ae2bf705b02c63a3ad48d74 /arch | |
| parent | 66f962d8939fd2ac74de901d30d30310c8ddca79 (diff) | |
| download | lwn-4525462dd0db9e86bb67c10dedbbaa4f8d62697d.tar.gz lwn-4525462dd0db9e86bb67c10dedbbaa4f8d62697d.zip | |
riscv: lib: Check if output in asm goto supported
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")
Link: https://lore.kernel.org/r/20240118-csum_remove_output_operands_asm_goto-v2-1-5d1b73cf93d4@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/riscv/lib/csum.c | 2 |
1 files changed, 2 insertions, 0 deletions
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 @@ end: return csum >> 16; } no_zbb: +#endif /* CC_HAS_ASM_GOTO_TIED_OUTPUT */ #ifndef CONFIG_32BIT csum += ror64(csum, 32); csum >>= 32; |