From 3ebb05d9a6bf6604a4b25770cfda1872983b03b2 Mon Sep 17 00:00:00 2001
From: Cameron Zwarich <zwarich@apple.com>
Date: Sat, 18 Jun 2011 06:17:51 +0000
Subject: When scalar replacement returns a vector type, only accept it if the
 vector type's bitwidth matches the (allocated) size of the alloca. This
 severely pessimizes vector scalar replacement when the only vector type being
 used is something like <3 x float> on x86 or ARM whose allocated size matches
 a <4 x float>.

I hope to fix some of the flawed assumptions about allocated size throughout
scalar replacement and reenable this in most cases.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133338 91177308-0d34-0410-b5e6-96231b3b80d8
---
 .../ScalarRepl/2011-06-08-VectorExtractValue.ll           |  6 ++++--
 .../ScalarRepl/2011-06-17-VectorPartialMemset.ll          | 15 +++++++++++++++
 2 files changed, 19 insertions(+), 2 deletions(-)

(limited to 'test/Transforms')

diff --git a/test/Transforms/ScalarRepl/2011-06-08-VectorExtractValue.ll b/test/Transforms/ScalarRepl/2011-06-08-VectorExtractValue.ll
index 32e67fbce7..98fa1c684c 100644
--- a/test/Transforms/ScalarRepl/2011-06-08-VectorExtractValue.ll
+++ b/test/Transforms/ScalarRepl/2011-06-08-VectorExtractValue.ll
@@ -10,7 +10,8 @@ target triple = "x86_64-apple-macosx10.7.0"
 
 ; CHECK: main
 ; CHECK-NOT: alloca
-; CHECK: extractelement <2 x float> zeroinitializer
+; CHECK: %[[A:[a-z0-9]*]] = and i128
+; CHECK: %[[B:[a-z0-9]*]] = trunc i128 %[[A]] to i32
 
 define void @main() uwtable ssp {
 entry:
@@ -27,7 +28,8 @@ entry:
 
 ; CHECK: test1
 ; CHECK-NOT: alloca
-; CHECK: extractelement <2 x float> zeroinitializer
+; CHECK: %[[A:[a-z0-9]*]] = and i128
+; CHECK: %[[B:[a-z0-9]*]] = trunc i128 %[[A]] to i32
 
 define void @test1() uwtable ssp {
 entry:
diff --git a/test/Transforms/ScalarRepl/2011-06-17-VectorPartialMemset.ll b/test/Transforms/ScalarRepl/2011-06-17-VectorPartialMemset.ll
index 29d195eba3..f8530d68a8 100644
--- a/test/Transforms/ScalarRepl/2011-06-17-VectorPartialMemset.ll
+++ b/test/Transforms/ScalarRepl/2011-06-17-VectorPartialMemset.ll
@@ -19,4 +19,19 @@ entry:
   ret float %val
 }
 
+; CHECK: g
+; CHECK-NOT: alloca
+; CHECK: and i128
+
+define void @g() nounwind ssp {
+entry:
+  %a = alloca { <4 x float> }, align 16
+  %p = bitcast { <4 x float> }* %a to i8*
+  call void @llvm.memset.p0i8.i32(i8* %p, i8 0, i32 16, i32 16, i1 false)
+  %q = bitcast { <4 x float> }* %a to [2 x <2 x float>]*
+  %arrayidx = getelementptr inbounds [2 x <2 x float>]* %q, i32 0, i32 0
+  store <2 x float> undef, <2 x float>* %arrayidx, align 8
+  ret void
+}
+
 declare void @llvm.memset.p0i8.i32(i8* nocapture, i8, i32, i32, i1) nounwind
-- 
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