code: purgatorio

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merge bea7f0cc7c9cdd883340c80697abc0be028bf944

--- a/emu/port/alloc.c

+++ b/emu/port/alloc.c

@@ -75,11 +75,7 @@

 /* tracing */

 enum {

-#ifdef __NetBSD__

-	Npadlong	= 4,	/* XXX: preserve 16-byte alignment */

-#else

 	Npadlong	= 2,

-#endif

 	MallocOffset = 0,

 	ReallocOffset = 1

 };

@@ -383,9 +379,22 @@

 		unlock(&p->l);

 		return nil;

 	}

+#ifdef __NetBSD__

+	/* Align allocations to 16 bytes */

+	{

+		const size_t off = __builtin_offsetof(struct Bhdr, u.data)

+					+ Npadlong*sizeof(ulong);

+		struct assert_align {

+			unsigned int align_ok : (off % 8 == 0) ? 1 : -1;

+		};

+

+		const ulong align = (off - 1) % 16;

+		t = (Bhdr *)(((ulong)t + align) & ~align);

+	}

+#else

 	/* Double alignment */

 	t = (Bhdr *)(((ulong)t + 7) & ~7);

-

+#endif

 	if(p->chain != nil && (char*)t-(char*)B2LIMIT(p->chain)-ldr == 0){

 		/* can merge chains */

 		if(0)print("merging chains %p and %p in %s\n", p->chain, t, p->name);