From 8e0c6fa5b693e90498045e582a5f66f6a78d67d0 Mon Sep 17 00:00:00 2001
From: Seo Sanghyeon <sanxiyn@gmail.com>
Date: Thu, 2 May 2013 16:59:26 +0900
Subject: [PATCH] Port IRBuilder::CreateVectorSplat

---
 src/librustc/middle/trans/build.rs  | 20 ++++++++++++++------
 src/librustc/middle/trans/common.rs |  6 ++++++
 2 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/src/librustc/middle/trans/build.rs b/src/librustc/middle/trans/build.rs
index c3dc4f1e8eb..29fd90edce8 100644
--- a/src/librustc/middle/trans/build.rs
+++ b/src/librustc/middle/trans/build.rs
@@ -963,20 +963,28 @@ pub fn ExtractElement(cx: block, VecVal: ValueRef, Index: ValueRef) ->
 }
 
 pub fn InsertElement(cx: block, VecVal: ValueRef, EltVal: ValueRef,
-                 Index: ValueRef) {
+                     Index: ValueRef) -> ValueRef {
     unsafe {
-        if cx.unreachable { return; }
+        if cx.unreachable { return llvm::LLVMGetUndef(T_nil()); }
         count_insn(cx, "insertelement");
-        llvm::LLVMBuildInsertElement(B(cx), VecVal, EltVal, Index, noname());
+        llvm::LLVMBuildInsertElement(B(cx), VecVal, EltVal, Index, noname())
     }
 }
 
 pub fn ShuffleVector(cx: block, V1: ValueRef, V2: ValueRef,
-                     Mask: ValueRef) {
+                     Mask: ValueRef) -> ValueRef {
     unsafe {
-        if cx.unreachable { return; }
+        if cx.unreachable { return llvm::LLVMGetUndef(T_nil()); }
         count_insn(cx, "shufflevector");
-        llvm::LLVMBuildShuffleVector(B(cx), V1, V2, Mask, noname());
+        llvm::LLVMBuildShuffleVector(B(cx), V1, V2, Mask, noname())
+    }
+}
+
+pub fn VectorSplat(cx: block, NumElts: uint, EltVal: ValueRef) -> ValueRef {
+    unsafe {
+        let Undef = llvm::LLVMGetUndef(T_vector(val_ty(EltVal), NumElts));
+        let VecVal = InsertElement(cx, Undef, EltVal, C_i32(0));
+        ShuffleVector(cx, VecVal, Undef, C_null(T_vector(T_i32(), NumElts)))
     }
 }
 
diff --git a/src/librustc/middle/trans/common.rs b/src/librustc/middle/trans/common.rs
index 442b5d25c8b..b004ba9d41f 100644
--- a/src/librustc/middle/trans/common.rs
+++ b/src/librustc/middle/trans/common.rs
@@ -984,6 +984,12 @@ pub fn T_array(t: TypeRef, n: uint) -> TypeRef {
     }
 }
 
+pub fn T_vector(t: TypeRef, n: uint) -> TypeRef {
+    unsafe {
+        return llvm::LLVMVectorType(t, n as c_uint);
+    }
+}
+
 // Interior vector.
 pub fn T_vec2(targ_cfg: @session::config, t: TypeRef) -> TypeRef {
     return T_struct(~[T_int(targ_cfg), // fill