--- a/gcc/config/i386/i386.h	2009-07-11 22:06:26.000000000 +0300
+++ a/gcc/config/i386/i386.h	2009-09-25 13:33:17.000000000 +0300
@@ -682,7 +682,9 @@ enum target_cpu_default
    need a 16-byte aligned stack, as required by SSE instructions.  If
    STACK_REALIGN_DEFAULT is 1 and PREFERRED_STACK_BOUNDARY_DEFAULT is
    128, stacks for all functions may be realigned.  */
-#define STACK_REALIGN_DEFAULT 0
+/* FIXME: I have no installed 3DNOW cpu to test */
+#define STACK_REALIGN_DEFAULT \
+	(((TARGET_SSE || TARGET_3DNOW) && !TARGET_64BIT) ? 1 : 0)
 
 /* Boundary (in *bits*) on which the incoming stack is aligned.  */
 #define INCOMING_STACK_BOUNDARY ix86_incoming_stack_boundary
--- a/gcc/config/i386/t-i386	2008-07-23 13:28:06.000000000 +0300
+++ a/gcc/config/i386/t-i386	2009-09-25 13:35:11.000000000 +0300
@@ -11,3 +11,9 @@ i386-c.o: $(srcdir)/config/i386/i386-c.c
   $(TM_H) $(RTL_H) $(TREE_H) $(TM_P_H) $(FLAGS_H) $(C_COMMON_H) $(GGC_H) \
   $(TARGET_H) $(TARGET_DEF_H) $(CPPLIB_H) $(C_PRAGMA_H)
 	$(CC) -c $(ALL_CFLAGS) $(ALL_CPPFLAGS) $(INCLUDES) $(srcdir)/config/i386/i386-c.c
+
+TARGET_LIBGCC2_CFLAGS += -mno-stackrealign
+
+# try if segfault to disable sse in gcc libs
+#TARGET_LIBGCC2_CFLAGS += -mno-sse -mno-3dnow
+
--- a/gcc/doc/g++.1	2009-07-22 11:23:37.000000000 +0300
+++ a/gcc/doc/g++.1	2009-09-24 22:52:19.000000000 +0300
@@ -10346,6 +10346,7 @@ runtime stack if necessary.  This suppor
 a 4\-byte aligned stack with modern codes that keep a 16\-byte stack for
 \&\s-1SSE\s0 compatibility.  See also the attribute \f(CW\*(C`force_align_arg_pointer\*(C'\fR,
 applicable to individual functions.
+It is enabled by default at SSE on 32bit.
 .IP "\fB\-mpreferred\-stack\-boundary=\fR\fInum\fR" 4
 .IX Item "-mpreferred-stack-boundary=num"
 Attempt to keep the stack boundary aligned to a 2 raised to \fInum\fR
--- a/gcc/doc/gcc.1	2009-07-22 10:53:09.000000000 +0300
+++ a/gcc/doc/gcc.1	2009-09-24 22:52:19.000000000 +0300
@@ -10346,6 +10346,7 @@ runtime stack if necessary.  This suppor
 a 4\-byte aligned stack with modern codes that keep a 16\-byte stack for
 \&\s-1SSE\s0 compatibility.  See also the attribute \f(CW\*(C`force_align_arg_pointer\*(C'\fR,
 applicable to individual functions.
+It is enabled by default at SSE on 32bit.
 .IP "\fB\-mpreferred\-stack\-boundary=\fR\fInum\fR" 4
 .IX Item "-mpreferred-stack-boundary=num"
 Attempt to keep the stack boundary aligned to a 2 raised to \fInum\fR