From 882e81ec1cde25f15945c435ea098145c0c93d21 Mon Sep 17 00:00:00 2001
From: David Nadlinger <code@klickverbot.at>
Date: Sun, 1 May 2011 01:16:36 +0200
Subject: [PATCH] Explicitly add %st as second argument to fucomip.

It should really be assumed implicitly, but the GNU as shipping with Mac OS X 10.6 (Apple Inc version cctools-800~26, GNU assembler version 1.38) chokes on the instruction otherwise.
---
 gen/asm-x86-64.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/gen/asm-x86-64.h b/gen/asm-x86-64.h
index 32b783d3..e2c3ecd3 100644
--- a/gen/asm-x86-64.h
+++ b/gen/asm-x86-64.h
@@ -1897,6 +1897,20 @@ namespace AsmParserx8664
                 else
                     stmt->error("instruction allows only ST as second argument");
             }
+            
+            if ( op == Op_FCmpFlgP )
+            {
+                // Explicitly add %st as second argument to fucomip – it should
+                // be implicit, but the GNU as shipping with Mac OS X (Apple Inc
+                // version cctools-800~26, GNU assembler version 1.38) chokes on
+                // it otherwise.
+                assert ( nOperands == 1 );
+                nOperands = 2;
+                operands[1] = operands[0];
+                memset ( operands, 0, sizeof( Operand ) );
+                operands[0].cls = Opr_Reg;
+                operands[0].reg = Reg_ST;
+            }
 
             if ( opInfo->needsType )
             {