From d600cbed0fe8fceec04500824f638dfe4996c653 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Mon, 1 Aug 2011 19:41:12 -0700 Subject: [PATCH] sparc: Use hweight64() in popc emulation. Signed-off-by: David S. Miller --- arch/sparc/kernel/unaligned_64.c | 15 ++++----------- 1 file changed, 4 insertions(+), 11 deletions(-) diff --git a/arch/sparc/kernel/unaligned_64.c b/arch/sparc/kernel/unaligned_64.c index 35cff1673aa4..76e4ac1a13e1 100644 --- a/arch/sparc/kernel/unaligned_64.c +++ b/arch/sparc/kernel/unaligned_64.c @@ -22,6 +22,7 @@ #include #include #include +#include #include enum direction { @@ -373,16 +374,11 @@ asmlinkage void kernel_unaligned_trap(struct pt_regs *regs, unsigned int insn) } } -static char popc_helper[] = { -0, 1, 1, 2, 1, 2, 2, 3, -1, 2, 2, 3, 2, 3, 3, 4, -}; - int handle_popc(u32 insn, struct pt_regs *regs) { - u64 value; - int ret, i, rd = ((insn >> 25) & 0x1f); int from_kernel = (regs->tstate & TSTATE_PRIV) != 0; + int ret, rd = ((insn >> 25) & 0x1f); + u64 value; perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, 0); if (insn & 0x2000) { @@ -392,10 +388,7 @@ int handle_popc(u32 insn, struct pt_regs *regs) maybe_flush_windows(0, insn & 0x1f, rd, from_kernel); value = fetch_reg(insn & 0x1f, regs); } - for (ret = 0, i = 0; i < 16; i++) { - ret += popc_helper[value & 0xf]; - value >>= 4; - } + ret = hweight64(value); if (rd < 16) { if (rd) regs->u_regs[rd] = ret; -- 2.20.1