| ... | @@ -9,12 +9,36 @@ comptime { | ... | @@ -9,12 +9,36 @@ comptime { |
| 9 | } | 9 | } |
| 10 | } | 10 | } |
| 11 | | 11 | |
| | 12 | const llvm_cannot_lower = switch (builtin.cpu.arch) { |
| | 13 | .arm, .armeb, .thumb, .thumbeb => builtin.zig_backend == .stage2_llvm, |
| | 14 | else => false, |
| | 15 | }; |
| | 16 | |
| 12 | fn memcpy(noalias opt_dest: ?[*]u8, noalias opt_src: ?[*]const u8, len: usize) callconv(.C) ?[*]u8 { | 17 | fn memcpy(noalias opt_dest: ?[*]u8, noalias opt_src: ?[*]const u8, len: usize) callconv(.C) ?[*]u8 { |
| 13 | return memmove(opt_dest, opt_src, len); | 18 | if (llvm_cannot_lower) { |
| | 19 | for (0..len) |i| opt_dest.?[i] = opt_src.?[i]; |
| | 20 | return opt_dest; |
| | 21 | } else { |
| | 22 | return memmove(opt_dest, opt_src, len); |
| | 23 | } |
| 14 | } | 24 | } |
| 15 | | 25 | |
| | 26 | /// A port of https://github.com/facebook/folly/blob/1c8bc50e88804e2a7361a57cd9b551dd10f6c5fd/folly/memcpy.S |
| 16 | fn memmove(opt_dest: ?[*]u8, opt_src: ?[*]const u8, len: usize) callconv(.C) ?[*]u8 { | 27 | fn memmove(opt_dest: ?[*]u8, opt_src: ?[*]const u8, len: usize) callconv(.C) ?[*]u8 { |
| 17 | // a port of https://github.com/facebook/folly/blob/1c8bc50e88804e2a7361a57cd9b551dd10f6c5fd/folly/memcpy.S | 28 | if (llvm_cannot_lower) { |
| | 29 | if (@intFromPtr(opt_dest) < @intFromPtr(opt_src)) { |
| | 30 | for (0..len) |i| opt_dest.?[i] = opt_src.?[i]; |
| | 31 | return opt_dest; |
| | 32 | } else { |
| | 33 | var index = len; |
| | 34 | while (index != 0) { |
| | 35 | index -= 1; |
| | 36 | opt_dest.?[index] = opt_src.?[index]; |
| | 37 | } |
| | 38 | return opt_dest; |
| | 39 | } |
| | 40 | } |
| | 41 | |
| 18 | if (len == 0) { | 42 | if (len == 0) { |
| 19 | @branchHint(.unlikely); | 43 | @branchHint(.unlikely); |
| 20 | return opt_dest; | 44 | return opt_dest; |
Andrew Kelley <andrew@ziglang.org> 2025-01-17 13:21:30-08:00
lib