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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: a04c192eab ("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>
This commit is contained in:
Charlie Jenkins 2024-01-18 14:36:45 -08:00 committed by Palmer Dabbelt
parent 66f962d893
commit 4525462dd0
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1 changed files with 2 additions and 0 deletions
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arch/riscv/lib/csum.c
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@ -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;