From 8d914ea7340c920c1929c5d666fc802b15f49a64 Mon Sep 17 00:00:00 2001 From: Andrew Kelley Date: Mon, 10 Feb 2025 16:13:35 -0800 Subject: [PATCH] compiler_rt memcpy: avoid infinite recursion when compiled in debug mode (--debug-rt) --- lib/compiler_rt/memcpy.zig | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/lib/compiler_rt/memcpy.zig b/lib/compiler_rt/memcpy.zig index 42b1974748..d3b44b4afc 100644 --- a/lib/compiler_rt/memcpy.zig +++ b/lib/compiler_rt/memcpy.zig @@ -175,10 +175,11 @@ inline fn copyRange4( const last = len - copy_len; const pen = last - b; - dest[0..copy_len].* = src[0..copy_len].*; - dest[b..][0..copy_len].* = src[b..][0..copy_len].*; - dest[pen..][0..copy_len].* = src[pen..][0..copy_len].*; - dest[last..][0..copy_len].* = src[last..][0..copy_len].*; + const Int = @Type(.{ .int = .{ .signedness = .unsigned, .bits = copy_len * 8 } }); + @as(*align(1) Int, @ptrCast(dest[0..copy_len])).* = @as(*align(1) const Int, @ptrCast(src[0..copy_len])).*; + @as(*align(1) Int, @ptrCast(dest[b..][0..copy_len])).* = @as(*align(1) const Int, @ptrCast(src[b..][0..copy_len])).*; + @as(*align(1) Int, @ptrCast(dest[pen..][0..copy_len])).* = @as(*align(1) const Int, @ptrCast(src[pen..][0..copy_len])).*; + @as(*align(1) Int, @ptrCast(dest[last..][0..copy_len])).* = @as(*align(1) const Int, @ptrCast(src[last..][0..copy_len])).*; } test "memcpy" {