From fc87033bf0fdc5530842cac8942dd1feaefcfd2a Mon Sep 17 00:00:00 2001
From: Andy Wingo <wingo@pobox.com>
Date: Wed, 28 Oct 2015 17:47:48 +0000
Subject: [PATCH] Stack slots can hold a double

* libguile/frames.h (union scm_vm_stack_element): Add double member.
* libguile/frames.c (scm_frame_local_ref, scm_frame_local_set_x): Wire
  up f64 support.
---
 libguile/frames.c | 5 +++--
 libguile/frames.h | 1 +
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/libguile/frames.c b/libguile/frames.c
index d522e762a..48e963a0f 100644
--- a/libguile/frames.c
+++ b/libguile/frames.c
@@ -262,7 +262,7 @@ SCM_DEFINE (scm_frame_local_ref, "frame-local-ref", 3, 0, 0,
           case STACK_ITEM_SCM:
             return item->as_scm;
           case STACK_ITEM_F64:
-            /* return item->as_f64; */
+            return scm_from_double (item->as_f64);
           default:
             abort();
         }
@@ -298,7 +298,8 @@ SCM_DEFINE (scm_frame_local_set_x, "frame-local-set!", 4, 0, 0,
             item->as_scm = val;
             break;
           case STACK_ITEM_F64:
-            /* item->as_f64 = scm_to_double (val); */
+            item->as_f64 = scm_to_double (val);
+            break;
           default:
             abort();
         }
diff --git a/libguile/frames.h b/libguile/frames.h
index c965bbfb7..bb402ae71 100644
--- a/libguile/frames.h
+++ b/libguile/frames.h
@@ -91,6 +91,7 @@ union scm_vm_stack_element
   scm_t_uintptr as_uint;
   scm_t_uint32 *as_ip;
   SCM as_scm;
+  double as_f64;
 
   /* For GC purposes.  */
   void *as_ptr;