BASEOP isn't an exact multiple of 8 bytes, so reordering pmop and cop

to put a 32 bit member first elimiates structure padding on LP64.

p4raw-id: //depot/perl@31218

1 files changed, 3 insertions, 1 deletions

diff --git a/op.h b/op.h
index 13fb30ed27..2d46fcfd4c 100644
--- a/op.h
+++ b/op.h
@@ -313,6 +313,9 @@ struct listop {
 
 struct pmop {
     BASEOP
+    /* On LP64 putting this here takes advantage of the fact that BASEOP isn't
+       an exact multiple of 8 bytes to save structure padding.  */
+    U32		op_pmflags;
     OP *	op_first;
     OP *	op_last;
 #ifdef USE_ITHREADS
@@ -320,7 +323,6 @@ struct pmop {
 #else
     REGEXP *    op_pmregexp;            /* compiled expression */
 #endif
-    U32		op_pmflags;
     union {
 	OP *	op_pmreplroot;		/* For OP_SUBST */
 #ifdef USE_ITHREADS