Use movss to implement insertelement when elements = 4 and index = 0.

src/IceInstX8632.h

Index: src/IceInstX8632.h
diff --git a/src/IceInstX8632.h b/src/IceInstX8632.h
index 67600574ef842a97160d184d06e7d69e226e5fb1..93970942b00b88f936b2f126b5533589a3e22e8f 100644
--- a/src/IceInstX8632.h
+++ b/src/IceInstX8632.h
@@ -552,7 +552,6 @@ typedef InstX8632Unaryop<InstX8632::Bsf> InstX8632Bsf;
 typedef InstX8632Unaryop<InstX8632::Bsr> InstX8632Bsr;
 typedef InstX8632Unaryop<InstX8632::Lea> InstX8632Lea;
 typedef InstX8632Unaryop<InstX8632::Movd> InstX8632Movd;
-typedef InstX8632Unaryop<InstX8632::Movss> InstX8632Movss;
 typedef InstX8632Unaryop<InstX8632::Sqrtss> InstX8632Sqrtss;
 typedef InstX8632Binop<InstX8632::Add> InstX8632Add;
 typedef InstX8632Binop<InstX8632::Addps> InstX8632Addps;
@@ -586,6 +585,7 @@ typedef InstX8632Binop<InstX8632::Sar, true> InstX8632Sar;
 typedef InstX8632Binop<InstX8632::Psra> InstX8632Psra;
 typedef InstX8632Binop<InstX8632::Pcmpeq> InstX8632Pcmpeq;
 typedef InstX8632Binop<InstX8632::Pcmpgt> InstX8632Pcmpgt;
+typedef InstX8632Binop<InstX8632::Movss> InstX8632Movss;

[Jim Stichnoth, 2014/07/25 20:07:12]

Could you add a TODO here, or somewhere appropriate, that the Dest (and hence
Src0) operand of the movss instruction should have a vector type?  Also, that
Dest should be a physical register.

The rationale is that (correct me if I'm wrong) the movss instruction is really
only a binary op when used with a vector instruction like insertelement,
otherwise it's more like mov/movsx/movzx.

[wala, 2014/07/25 22:57:41]

Done.

Per our discussion, movss is a binary op only when both source and dest operands
are registers. Any current use of _movss as a non binary op should be made to
use _mov eventually.

 typedef InstX8632Ternop<InstX8632::Idiv> InstX8632Idiv;
 typedef InstX8632Ternop<InstX8632::Div> InstX8632Div;
 typedef InstX8632Ternop<InstX8632::Pinsrw> InstX8632Pinsrw;