* i386.h (PREFERRED_STACK_BOUNDARY): Set to 128.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@25973 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index cc4577a..e16fb40 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+Thu Mar 25 10:05:56 1999  Richard Henderson  <rth@cygnus.com>
+
+       * i386.h (PREFERRED_STACK_BOUNDARY): Set to 128.
+
 1999-03-25  Philip Blundell  <pb@nexus.co.uk>
 
        Based on patch from Jim Studt <jim@federated.com>:

diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h
index 417627f..4f4d553 100644 (file)
--- a/gcc/config/i386/i386.h
+++ b/gcc/config/i386/i386.h
@@ -410,9 +410,10 @@ extern int ix86_arch;
 /* Boundary (in *bits*) on which stack pointer should be aligned.  */
 #define STACK_BOUNDARY 32
 
-/* We want to keep the stack aligned to 64bits when possible.  But the
-   compiler can not rely on the stack having this alignment.*/
-#define PREFERRED_STACK_BOUNDARY 64
+/* We want to keep the stack aligned to 128 bits when possible, for the
+   benefit of doubles and SSE __m128.  But the compiler can not rely on
+   the stack having this alignment.*/
+#define PREFERRED_STACK_BOUNDARY 128
 
 /* Allocation boundary (in *bits*) for the code of a function.
    For i486, we get better performance by aligning to a cache