Merge pull request #3634 from yebblies/issue12873

Issue 12873 - Valgrind unhandled instruction bytes 0x48 0xDB (redundant REX_W prefix on x87 load)
dlang · Jun 7, 2014 · a44b7b8 · a44b7b8
2 parents b0ccc87 + 5d79f23
commit a44b7b8
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/backend/cg87.c b/src/backend/cg87.c
@@ -3492,6 +3492,8 @@ code *cdind87(elem *e,regm_t *pretregs)
 
             case TYildouble:
             case TYldouble:
+                if (I64)
+                    cs.Irex &= ~REX_W;
                 cs.Iop = 0xDB;
                 cs.Irm |= modregrm(0,5,0);
                 break;