Fixing a heisenbug where the memory dependence analysis behaves differently

[oota-llvm.git] / test / Transforms / ScalarRepl / copy-aggregate.ll

diff --git a/test/Transforms/ScalarRepl/copy-aggregate.ll b/test/Transforms/ScalarRepl/copy-aggregate.ll
index a1ad3f9b82807685a1035adfad0aea95ab2f5e6a..51ba8109b39b0df67f9df1361f04656dc3818a7a 100644 (file)
--- a/test/Transforms/ScalarRepl/copy-aggregate.ll
+++ b/test/Transforms/ScalarRepl/copy-aggregate.ll
@@ -1,8 +1,11 @@
-; RUN: llvm-as < %s | opt -scalarrepl | llvm-dis | not grep alloca
+; RUN: opt < %s -scalarrepl -S | FileCheck %s
 ; PR3290
+target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64"
 
 ;; Store of integer to whole alloca struct.
 define i32 @test1(i64 %V) nounwind {
+; CHECK: test1
+; CHECK-NOT: alloca
        %X = alloca {{i32, i32}}
        %Y = bitcast {{i32,i32}}* %X to i64*
        store i64 %V, i64* %Y
@@ -17,6 +20,8 @@ define i32 @test1(i64 %V) nounwind {
 
 ;; Store of integer to whole struct/array alloca.
 define float @test2(i128 %V) nounwind {
+; CHECK: test2
+; CHECK-NOT: alloca
        %X = alloca {[4 x float]}
        %Y = bitcast {[4 x float]}* %X to i128*
        store i128 %V, i128* %Y
@@ -31,6 +36,8 @@ define float @test2(i128 %V) nounwind {
 
 ;; Load of whole alloca struct as integer
 define i64 @test3(i32 %a, i32 %b) nounwind {
+; CHECK: test3
+; CHECK-NOT: alloca
        %X = alloca {{i32, i32}}
 
        %A = getelementptr {{i32,i32}}* %X, i32 0, i32 0, i32 0
@@ -45,6 +52,8 @@ define i64 @test3(i32 %a, i32 %b) nounwind {
 
 ;; load of integer from whole struct/array alloca.
 define i128 @test4(float %a, float %b) nounwind {
+; CHECK: test4
+; CHECK-NOT: alloca
        %X = alloca {[4 x float]}
        %A = getelementptr {[4 x float]}* %X, i32 0, i32 0, i32 0
        %B = getelementptr {[4 x float]}* %X, i32 0, i32 0, i32 3
@@ -55,3 +64,44 @@ define i128 @test4(float %a, float %b) nounwind {
        %V = load i128* %Y
        ret i128 %V
 }
+
+;; If the elements of a struct or array alloca contain padding, SROA can still
+;; split up the alloca as long as there is no padding between the elements.
+%padded = type { i16, i8 }
+define void @test5([4 x %padded]* %p, [4 x %padded]* %q) {
+entry:
+; CHECK: test5
+; CHECK-NOT: i128
+  %var = alloca [4 x %padded], align 4
+  %vari8 = bitcast [4 x %padded]* %var to i8*
+  %pi8 = bitcast [4 x %padded]* %p to i8*
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %vari8, i8* %pi8, i32 16, i32 4, i1 false)
+  %qi8 = bitcast [4 x %padded]* %q to i8*
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %qi8, i8* %vari8, i32 16, i32 4, i1 false)
+  ret void
+}
+
+;; Check that an array alloca can be split up when it is also accessed with
+;; a load or store as a homogeneous structure with the same element type and
+;; number of elements as the array.
+%homogeneous = type { <8 x i16>, <8 x i16>, <8 x i16> }
+%wrapped_array = type { [3 x <8 x i16>] }
+define void @test6(i8* %p, %wrapped_array* %arr) {
+entry:
+; CHECK: test6
+; CHECK: store <8 x i16>
+; CHECK: store <8 x i16>
+; CHECK: store <8 x i16>
+  %var = alloca %wrapped_array, align 16
+  %res = call %homogeneous @test6callee(i8* %p)
+  %varcast = bitcast %wrapped_array* %var to %homogeneous*
+  store %homogeneous %res, %homogeneous* %varcast
+  %tmp1 = bitcast %wrapped_array* %arr to i8*
+  %tmp2 = bitcast %wrapped_array* %var to i8*
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %tmp1, i8* %tmp2, i32 48, i32 16, i1 false)
+  ret void
+}
+
+declare %homogeneous @test6callee(i8* nocapture) nounwind
+
+declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind