Update InstCombine to transform aggregate stores into scalar stores.

Summary: This is a first step toward getting proper support for aggregate loads and stores.

Test Plan: Added unittests

Reviewers: reames, chandlerc

Reviewed By: chandlerc

Subscribers: majnemer, joker.eph, chandlerc, llvm-commits

Differential Revision: http://reviews.llvm.org/D7780

Patch by Amaury Sechet

From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 232284

1 files changed, 31 insertions, 0 deletions

diff --git a/llvm/test/Transforms/InstCombine/unpack-fca.ll b/llvm/test/Transforms/InstCombine/unpack-fca.ll
new file mode 100644
index 00000000000..5f63330b931
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/unpack-fca.ll
@@ -0,0 +1,31 @@
+; RUN: opt -instcombine -S < %s | FileCheck %s
+
+target datalayout = "e-i64:64-f80:128-n8:16:32:64"
+target triple = "x86_64-unknown-linux-gnu"
+
+%A__vtbl = type { i8*, i32 (%A*)* }
+%A = type { %A__vtbl* }
+
+@A__vtblZ = constant %A__vtbl { i8* null, i32 (%A*)* @A.foo }
+
+declare i32 @A.foo(%A* nocapture %this)
+
+declare i8* @allocmemory(i64)
+
+define void @structA() {
+body:
+  %0 = tail call i8* @allocmemory(i64 32)
+  %1 = bitcast i8* %0 to %A*
+; CHECK: store %A__vtbl* @A__vtblZ
+  store %A { %A__vtbl* @A__vtblZ }, %A* %1, align 8
+  ret void
+}
+
+define void @structOfA() {
+body:
+  %0 = tail call i8* @allocmemory(i64 32)
+  %1 = bitcast i8* %0 to { %A }*
+; CHECK: store %A__vtbl* @A__vtblZ
+  store { %A } { %A { %A__vtbl* @A__vtblZ } }, { %A }* %1, align 8
+  ret void
+}