Add option to force filetype=asm for testing

src/IceTargetLoweringX8664.cpp

Index: src/IceTargetLoweringX8664.cpp
diff --git a/src/IceTargetLoweringX8664.cpp b/src/IceTargetLoweringX8664.cpp
index 6844d4adc4359606f99414424b80633d2a9bf478..8aea38387286c08764bdaf40142a18c7a6c12619 100644
--- a/src/IceTargetLoweringX8664.cpp
+++ b/src/IceTargetLoweringX8664.cpp
@@ -367,7 +367,14 @@ void TargetX8664::lowerRet(const InstRet *Inst) {
       Reg = legalizeToReg(Src0, Traits::RegisterSet::Reg_xmm0);
     } else {
       assert(isScalarIntegerType(Src0->getType()));
-      _mov(Reg, Src0, Traits::RegisterSet::Reg_eax);
+      if (Src0->getType() == IceType_i8) {

[Jim Stichnoth, 2015/12/20 18:42:23]

Same comment as in x86-32 - handle IceType_i1 as well

[sehr, 2016/01/07 18:53:11]

Done.

+        // TODO(sehr,stichnot): I think these need to sign/zero extend.
+        _mov(Reg, Src0, Traits::RegisterSet::Reg_al);
+      } else if (Src0->getType() == IceType_i16) {
+        _mov(Reg, Src0, Traits::RegisterSet::Reg_ax);
+      } else {
+        _mov(Reg, Src0, Traits::RegisterSet::Reg_eax);

[Jim Stichnoth, 2015/12/20 18:42:23]

You probably need to deal with i32/eax and i64/rax as well, otherwise it will
likely break the x86-64 resurrection CL.

[sehr, 2016/01/07 18:53:11]

John beat me to the punch.  It should work there also.

+      }
     }
   }
   // Add a ret instruction even if sandboxing is enabled, because addEpilog