add comment why preferred stack boundary is 4 on i386

Gnurou · Jul 23, 2007 · 65b8cfb · 65b8cfb
1 parent 64a8a3b
commit 65b8cfb
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/arch/i386/Makefile b/arch/i386/Makefile
@@ -2,4 +2,6 @@
 # Build system
 # ==========================================================================
 
+# -mpreferred-stack-boundary=2 is essential in preventing gcc 4.2.x
+# from aligning stack to 16 bytes. (Which is gcc's way of supporting SSE).
 CFLAGS += $(call cc-option,-march=i386 -mpreferred-stack-boundary=2,)