authorgravatar for 124872+jedisct1@users.noreply.github.comFrank Denis <124872+jedisct1@users.noreply.github.com> 2020-10-02 21:16:18+02:00
committergravatar for andrew@ziglang.orgAndrew Kelley <andrew@ziglang.org> 2020-10-08 18:09:23-04:00
log1bc2b68916a193975af8d8f4d648a8df9bdb5593
tree4040948c0848d287d859e8fe629a7b3dd6d609e2
parent83eda214882e33e65794cee1e7c0d87777b31bf4

ghash: add pmull support on aarch64

1 files changed, 19 insertions(+), 1 deletions(-)

lib/std/crypto/ghash.zig+19-1
......@@ -105,6 +105,17 @@ pub const Ghash = struct {
105105 return product[0];
106106 }
107107
108 inline fn clmul_pmull(x: u64, y: u64) u64 {
109 const Vector = std.meta.Vector;
110 const product = asm (
111 \\ pmull %[out].1q, %[x].1d, %[y].1d
112 : [out] "=w" (-> Vector(2, u64))
113 : [x] "w" (@bitCast(Vector(2, u64), @as(u128, x))),
114 [y] "w" (@bitCast(Vector(2, u64), @as(u128, y)))
115 );
116 return product[0];
117 }
118
108119 fn clmul_soft(x: u64, y: u64) u64 {
109120 const x0 = x & 0x1111111111111111;
110121 const x1 = x & 0x2222222222222222;
......@@ -127,7 +138,14 @@ pub const Ghash = struct {
127138
128139 const has_pclmul = comptime std.Target.x86.featureSetHas(std.Target.current.cpu.features, .pclmul);
129140 const has_avx = comptime std.Target.x86.featureSetHas(std.Target.current.cpu.features, .avx);
130 const clmul = if (std.Target.current.cpu.arch == .x86_64 and has_pclmul and has_avx) clmul_pclmul else clmul_soft;
141 const has_armaes = comptime std.Target.aarch64.featureSetHas(std.Target.current.cpu.features, .aes);
142 const clmul = if (std.Target.current.cpu.arch == .x86_64 and has_pclmul and has_avx) impl: {
143 break :impl clmul_pclmul;
144 } else if (std.Target.current.cpu.arch == .aarch64 and has_armaes) impl: {
145 break :impl clmul_pmull;
146 } else impl: {
147 break :impl clmul_soft;
148 };
131149
132150 fn blocks(st: *Ghash, msg: []const u8) void {
133151 assert(msg.len % 16 == 0); // GHASH blocks() expects full blocks