[PATCH] powerpc: Reduce csum_add() complexity for PPC64
From: Christophe Leroy <hidden>
Date: 2022-02-12 07:36:34
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
PPC64 does everything in C, gcc is able to skip calculation when one of the operands in zero. Move the constant folding in PPC32 part. This helps GCC and reduces ppc64_defconfig by 170 bytes. Signed-off-by: Christophe Leroy <redacted> --- arch/powerpc/include/asm/checksum.h | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-)
diff --git a/arch/powerpc/include/asm/checksum.h b/arch/powerpc/include/asm/checksum.h
index 3288a1bf5e8d..e4e25b46ac49 100644
--- a/arch/powerpc/include/asm/checksum.h
+++ b/arch/powerpc/include/asm/checksum.h@@ -95,16 +95,15 @@ static __always_inline __wsum csum_add(__wsum csum, __wsum addend) { #ifdef __powerpc64__ u64 res = (__force u64)csum; -#endif + + res += (__force u64)addend; + return (__force __wsum)((u32)res + (res >> 32)); +#else if (__builtin_constant_p(csum) && csum == 0) return addend; if (__builtin_constant_p(addend) && addend == 0) return csum; -#ifdef __powerpc64__ - res += (__force u64)addend; - return (__force __wsum)((u32)res + (res >> 32)); -#else asm("addc %0,%0,%1;" "addze %0,%0;" : "+r" (csum) : "r" (addend) : "xer");
--
2.34.1