qbe

commit a6ef2279c71a4528c5bfebf1b857a6faf554a160
parent 64e5dd3421dade2ead540572fc0d945ade1f02bb
Author: Quentin Carbonneaux <quentin.carbonneaux@yale.edu>
Date:   Wed,  9 Mar 2016 11:03:39 -0500

document more hybrid return

Diffstat:
M
doc/abi.txt
 | 
6
++++--

1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/doc/abi.txt b/doc/abi.txt
@@ -114,8 +114,10 @@ Legend:
 
   * A struct can be returned in registers in one of three
     ways.  Either `%rax`, `%rdx` are used, or `%xmm0`,
-    `%xmm1`, or finally `%rax`, `%xmm0`.  This should be
-    clear from the <@Returning> section above.
+    `%xmm1`, or finally `%rax`, `%xmm0`.  The last case
+    happens when a struct is returned with one half
+    classified as INTEGER and the other as SSE. This
+    is a consequence of the <@Returning> section above.
 
   * The size of the arguments area of the stack needs to
     be computed first, then arguments are packed starting