qbe

commit 17cba8793e759bd8b4a96bb1dc5b3fd51b7cde65
parent f8cd43adc4f95cecfaa7346f7fcdad98633f1b07
Author: Quentin Carbonneaux <quentin.carbonneaux@yale.edu>
Date:   Tue, 18 Aug 2015 17:19:08 -0400

add comment about variadic functions in abi

Diffstat:
M
lisc/ABI
 | 
3
+++

1 file changed, 3 insertions(+), 0 deletions(-)
diff --git a/lisc/ABI b/lisc/ABI
@@ -36,6 +36,9 @@ Passing:
    on the stack.
  - When all registers are taken, write arguments on the
    stack from right to left.
+ - When calling a variadic function, %al stores the number
+   of vector registers used to pass arguments (it must be
+   an upper bound and does not have to be exact).
  - Registers %rbx, %r12 - %r15 are callee-save.
 
 Returning.