1 files changed, 741 insertions, 0 deletions
diff --git a/test/Transforms/SROA/basictest.ll b/test/Transforms/SROA/basictest.ll
new file mode 100644
index 0000000..e6a3485
--- /dev/null
+++ b/test/Transforms/SROA/basictest.ll
@@ -0,0 +1,741 @@
+; RUN: opt < %s -sroa -S | FileCheck %s
+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-n8:16:32:64"
+
+define i32 @test0() {
+; CHECK: @test0
+; CHECK-NOT: alloca
+; CHECK: ret i32
+
+entry:
+  %a1 = alloca i32
+  %a2 = alloca float
+
+  store i32 0, i32* %a1
+  %v1 = load i32* %a1
+
+  store float 0.0, float* %a2
+  %v2 = load float * %a2
+  %v2.int = bitcast float %v2 to i32
+  %sum1 = add i32 %v1, %v2.int
+
+  ret i32 %sum1
+}
+
+define i32 @test1() {
+; CHECK: @test1
+; CHECK-NOT: alloca
+; CHECK: ret i32 0
+
+entry:
+  %X = alloca { i32, float }
+  %Y = getelementptr { i32, float }* %X, i64 0, i32 0
+  store i32 0, i32* %Y
+  %Z = load i32* %Y
+  ret i32 %Z
+}
+
+define i64 @test2(i64 %X) {
+; CHECK: @test2
+; CHECK-NOT: alloca
+; CHECK: ret i64 %X
+
+entry:
+  %A = alloca [8 x i8]
+  %B = bitcast [8 x i8]* %A to i64*
+  store i64 %X, i64* %B
+  br label %L2
+
+L2:
+  %Z = load i64* %B
+  ret i64 %Z
+}
+
+define void @test3(i8* %dst, i8* %src) {
+; CHECK: @test3
+
+entry:
+  %a = alloca [300 x i8]
+; CHECK-NOT:  alloca
+; CHECK:      %[[test3_a1:.*]] = alloca [42 x i8]
+; CHECK-NEXT: %[[test3_a2:.*]] = alloca [99 x i8]
+; CHECK-NEXT: %[[test3_a3:.*]] = alloca [16 x i8]
+; CHECK-NEXT: %[[test3_a4:.*]] = alloca [42 x i8]
+; CHECK-NEXT: %[[test3_a5:.*]] = alloca [7 x i8]
+; CHECK-NEXT: %[[test3_a6:.*]] = alloca [7 x i8]
+; CHECK-NEXT: %[[test3_a7:.*]] = alloca [85 x i8]
+
+  %b = getelementptr [300 x i8]* %a, i64 0, i64 0
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %b, i8* %src, i32 300, i32 1, i1 false)
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds [42 x i8]* %[[test3_a1]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %src, i32 42
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds i8* %src, i64 42
+; CHECK-NEXT: %[[test3_r1:.*]] = load i8* %[[gep]]
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds i8* %src, i64 43
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds [99 x i8]* %[[test3_a2]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 99
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds i8* %src, i64 142
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds [16 x i8]* %[[test3_a3]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 16
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds i8* %src, i64 158
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds [42 x i8]* %[[test3_a4]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 42
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds i8* %src, i64 200
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds [7 x i8]* %[[test3_a5]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 7
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds i8* %src, i64 207
+; CHECK-NEXT: %[[test3_r2:.*]] = load i8* %[[gep]]
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds i8* %src, i64 208
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds [7 x i8]* %[[test3_a6]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 7
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds i8* %src, i64 215
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds [85 x i8]* %[[test3_a7]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 85
+
+  ; Clobber a single element of the array, this should be promotable.
+  %c = getelementptr [300 x i8]* %a, i64 0, i64 42
+  store i8 0, i8* %c
+
+  ; Make a sequence of overlapping stores to the array. These overlap both in
+  ; forward strides and in shrinking accesses.
+  %overlap.1.i8 = getelementptr [300 x i8]* %a, i64 0, i64 142
+  %overlap.2.i8 = getelementptr [300 x i8]* %a, i64 0, i64 143
+  %overlap.3.i8 = getelementptr [300 x i8]* %a, i64 0, i64 144
+  %overlap.4.i8 = getelementptr [300 x i8]* %a, i64 0, i64 145
+  %overlap.5.i8 = getelementptr [300 x i8]* %a, i64 0, i64 146
+  %overlap.6.i8 = getelementptr [300 x i8]* %a, i64 0, i64 147
+  %overlap.7.i8 = getelementptr [300 x i8]* %a, i64 0, i64 148
+  %overlap.8.i8 = getelementptr [300 x i8]* %a, i64 0, i64 149
+  %overlap.9.i8 = getelementptr [300 x i8]* %a, i64 0, i64 150
+  %overlap.1.i16 = bitcast i8* %overlap.1.i8 to i16*
+  %overlap.1.i32 = bitcast i8* %overlap.1.i8 to i32*
+  %overlap.1.i64 = bitcast i8* %overlap.1.i8 to i64*
+  %overlap.2.i64 = bitcast i8* %overlap.2.i8 to i64*
+  %overlap.3.i64 = bitcast i8* %overlap.3.i8 to i64*
+  %overlap.4.i64 = bitcast i8* %overlap.4.i8 to i64*
+  %overlap.5.i64 = bitcast i8* %overlap.5.i8 to i64*
+  %overlap.6.i64 = bitcast i8* %overlap.6.i8 to i64*
+  %overlap.7.i64 = bitcast i8* %overlap.7.i8 to i64*
+  %overlap.8.i64 = bitcast i8* %overlap.8.i8 to i64*
+  %overlap.9.i64 = bitcast i8* %overlap.9.i8 to i64*
+  store i8 1, i8* %overlap.1.i8
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [16 x i8]* %[[test3_a3]], i64 0, i64 0
+; CHECK-NEXT: store i8 1, i8* %[[gep]]
+  store i16 1, i16* %overlap.1.i16
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast [16 x i8]* %[[test3_a3]] to i16*
+; CHECK-NEXT: store i16 1, i16* %[[bitcast]]
+  store i32 1, i32* %overlap.1.i32
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast [16 x i8]* %[[test3_a3]] to i32*
+; CHECK-NEXT: store i32 1, i32* %[[bitcast]]
+  store i64 1, i64* %overlap.1.i64
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast [16 x i8]* %[[test3_a3]] to i64*
+; CHECK-NEXT: store i64 1, i64* %[[bitcast]]
+  store i64 2, i64* %overlap.2.i64
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [16 x i8]* %[[test3_a3]], i64 0, i64 1
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast i8* %[[gep]] to i64*
+; CHECK-NEXT: store i64 2, i64* %[[bitcast]]
+  store i64 3, i64* %overlap.3.i64
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [16 x i8]* %[[test3_a3]], i64 0, i64 2
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast i8* %[[gep]] to i64*
+; CHECK-NEXT: store i64 3, i64* %[[bitcast]]
+  store i64 4, i64* %overlap.4.i64
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [16 x i8]* %[[test3_a3]], i64 0, i64 3
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast i8* %[[gep]] to i64*
+; CHECK-NEXT: store i64 4, i64* %[[bitcast]]
+  store i64 5, i64* %overlap.5.i64
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [16 x i8]* %[[test3_a3]], i64 0, i64 4
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast i8* %[[gep]] to i64*
+; CHECK-NEXT: store i64 5, i64* %[[bitcast]]
+  store i64 6, i64* %overlap.6.i64
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [16 x i8]* %[[test3_a3]], i64 0, i64 5
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast i8* %[[gep]] to i64*
+; CHECK-NEXT: store i64 6, i64* %[[bitcast]]
+  store i64 7, i64* %overlap.7.i64
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [16 x i8]* %[[test3_a3]], i64 0, i64 6
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast i8* %[[gep]] to i64*
+; CHECK-NEXT: store i64 7, i64* %[[bitcast]]
+  store i64 8, i64* %overlap.8.i64
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [16 x i8]* %[[test3_a3]], i64 0, i64 7
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast i8* %[[gep]] to i64*
+; CHECK-NEXT: store i64 8, i64* %[[bitcast]]
+  store i64 9, i64* %overlap.9.i64
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [16 x i8]* %[[test3_a3]], i64 0, i64 8
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast i8* %[[gep]] to i64*
+; CHECK-NEXT: store i64 9, i64* %[[bitcast]]
+
+  ; Make two sequences of overlapping stores with more gaps and irregularities.
+  %overlap2.1.0.i8 = getelementptr [300 x i8]* %a, i64 0, i64 200
+  %overlap2.1.1.i8 = getelementptr [300 x i8]* %a, i64 0, i64 201
+  %overlap2.1.2.i8 = getelementptr [300 x i8]* %a, i64 0, i64 202
+  %overlap2.1.3.i8 = getelementptr [300 x i8]* %a, i64 0, i64 203
+
+  %overlap2.2.0.i8 = getelementptr [300 x i8]* %a, i64 0, i64 208
+  %overlap2.2.1.i8 = getelementptr [300 x i8]* %a, i64 0, i64 209
+  %overlap2.2.2.i8 = getelementptr [300 x i8]* %a, i64 0, i64 210
+  %overlap2.2.3.i8 = getelementptr [300 x i8]* %a, i64 0, i64 211
+
+  %overlap2.1.0.i16 = bitcast i8* %overlap2.1.0.i8 to i16*
+  %overlap2.1.0.i32 = bitcast i8* %overlap2.1.0.i8 to i32*
+  %overlap2.1.1.i32 = bitcast i8* %overlap2.1.1.i8 to i32*
+  %overlap2.1.2.i32 = bitcast i8* %overlap2.1.2.i8 to i32*
+  %overlap2.1.3.i32 = bitcast i8* %overlap2.1.3.i8 to i32*
+  store i8 1,  i8*  %overlap2.1.0.i8
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [7 x i8]* %[[test3_a5]], i64 0, i64 0
+; CHECK-NEXT: store i8 1, i8* %[[gep]]
+  store i16 1, i16* %overlap2.1.0.i16
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast [7 x i8]* %[[test3_a5]] to i16*
+; CHECK-NEXT: store i16 1, i16* %[[bitcast]]
+  store i32 1, i32* %overlap2.1.0.i32
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast [7 x i8]* %[[test3_a5]] to i32*
+; CHECK-NEXT: store i32 1, i32* %[[bitcast]]
+  store i32 2, i32* %overlap2.1.1.i32
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [7 x i8]* %[[test3_a5]], i64 0, i64 1
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast i8* %[[gep]] to i32*
+; CHECK-NEXT: store i32 2, i32* %[[bitcast]]
+  store i32 3, i32* %overlap2.1.2.i32
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [7 x i8]* %[[test3_a5]], i64 0, i64 2
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast i8* %[[gep]] to i32*
+; CHECK-NEXT: store i32 3, i32* %[[bitcast]]
+  store i32 4, i32* %overlap2.1.3.i32
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [7 x i8]* %[[test3_a5]], i64 0, i64 3
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast i8* %[[gep]] to i32*
+; CHECK-NEXT: store i32 4, i32* %[[bitcast]]
+
+  %overlap2.2.0.i32 = bitcast i8* %overlap2.2.0.i8 to i32*
+  %overlap2.2.1.i16 = bitcast i8* %overlap2.2.1.i8 to i16*
+  %overlap2.2.1.i32 = bitcast i8* %overlap2.2.1.i8 to i32*
+  %overlap2.2.2.i32 = bitcast i8* %overlap2.2.2.i8 to i32*
+  %overlap2.2.3.i32 = bitcast i8* %overlap2.2.3.i8 to i32*
+  store i32 1, i32* %overlap2.2.0.i32
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast [7 x i8]* %[[test3_a6]] to i32*
+; CHECK-NEXT: store i32 1, i32* %[[bitcast]]
+  store i8 1,  i8*  %overlap2.2.1.i8
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [7 x i8]* %[[test3_a6]], i64 0, i64 1
+; CHECK-NEXT: store i8 1, i8* %[[gep]]
+  store i16 1, i16* %overlap2.2.1.i16
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [7 x i8]* %[[test3_a6]], i64 0, i64 1
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast i8* %[[gep]] to i16*
+; CHECK-NEXT: store i16 1, i16* %[[bitcast]]
+  store i32 1, i32* %overlap2.2.1.i32
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [7 x i8]* %[[test3_a6]], i64 0, i64 1
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast i8* %[[gep]] to i32*
+; CHECK-NEXT: store i32 1, i32* %[[bitcast]]
+  store i32 3, i32* %overlap2.2.2.i32
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [7 x i8]* %[[test3_a6]], i64 0, i64 2
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast i8* %[[gep]] to i32*
+; CHECK-NEXT: store i32 3, i32* %[[bitcast]]
+  store i32 4, i32* %overlap2.2.3.i32
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [7 x i8]* %[[test3_a6]], i64 0, i64 3
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast i8* %[[gep]] to i32*
+; CHECK-NEXT: store i32 4, i32* %[[bitcast]]
+
+  %overlap2.prefix = getelementptr i8* %overlap2.1.1.i8, i64 -4
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %overlap2.prefix, i8* %src, i32 8, i32 1, i1 false)
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds [42 x i8]* %[[test3_a4]], i64 0, i64 39
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %src, i32 3
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds i8* %src, i64 3
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds [7 x i8]* %[[test3_a5]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 5
+
+  ; Bridge between the overlapping areas
+  call void @llvm.memset.p0i8.i32(i8* %overlap2.1.2.i8, i8 42, i32 8, i32 1, i1 false)
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [7 x i8]* %[[test3_a5]], i64 0, i64 2
+; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* %[[gep]], i8 42, i32 5
+; ...promoted i8 store...
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [7 x i8]* %[[test3_a6]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* %[[gep]], i8 42, i32 2
+
+  ; Entirely within the second overlap.
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %overlap2.2.1.i8, i8* %src, i32 5, i32 1, i1 false)
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [7 x i8]* %[[test3_a6]], i64 0, i64 1
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep]], i8* %src, i32 5
+
+  ; Trailing past the second overlap.
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %overlap2.2.2.i8, i8* %src, i32 8, i32 1, i1 false)
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [7 x i8]* %[[test3_a6]], i64 0, i64 2
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep]], i8* %src, i32 5
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds i8* %src, i64 5
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds [85 x i8]* %[[test3_a7]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 3
+
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dst, i8* %b, i32 300, i32 1, i1 false)
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [42 x i8]* %[[test3_a1]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dst, i8* %[[gep]], i32 42
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds i8* %dst, i64 42
+; CHECK-NEXT: store i8 0, i8* %[[gep]]
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds i8* %dst, i64 43
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds [99 x i8]* %[[test3_a2]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 99
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds i8* %dst, i64 142
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds [16 x i8]* %[[test3_a3]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 16
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds i8* %dst, i64 158
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds [42 x i8]* %[[test3_a4]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 42
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds i8* %dst, i64 200
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds [7 x i8]* %[[test3_a5]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 7
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds i8* %dst, i64 207
+; CHECK-NEXT: store i8 42, i8* %[[gep]]
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds i8* %dst, i64 208
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds [7 x i8]* %[[test3_a6]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 7
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds i8* %dst, i64 215
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds [85 x i8]* %[[test3_a7]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 85
+
+  ret void
+}
+
+define void @test4(i8* %dst, i8* %src) {
+; CHECK: @test4
+
+entry:
+  %a = alloca [100 x i8]
+; CHECK-NOT:  alloca
+; CHECK:      %[[test4_a1:.*]] = alloca [20 x i8]
+; CHECK-NEXT: %[[test4_a2:.*]] = alloca [7 x i8]
+; CHECK-NEXT: %[[test4_a3:.*]] = alloca [10 x i8]
+; CHECK-NEXT: %[[test4_a4:.*]] = alloca [7 x i8]
+; CHECK-NEXT: %[[test4_a5:.*]] = alloca [7 x i8]
+; CHECK-NEXT: %[[test4_a6:.*]] = alloca [40 x i8]
+
+  %b = getelementptr [100 x i8]* %a, i64 0, i64 0
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %b, i8* %src, i32 100, i32 1, i1 false)
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [20 x i8]* %[[test4_a1]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep]], i8* %src, i32 20
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds i8* %src, i64 20
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast i8* %[[gep]] to i16*
+; CHECK-NEXT: %[[test4_r1:.*]] = load i16* %[[bitcast]]
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds i8* %src, i64 22
+; CHECK-NEXT: %[[test4_r2:.*]] = load i8* %[[gep]]
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds i8* %src, i64 23
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds [7 x i8]* %[[test4_a2]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 7
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds i8* %src, i64 30
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds [10 x i8]* %[[test4_a3]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 10
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds i8* %src, i64 40
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast i8* %[[gep]] to i16*
+; CHECK-NEXT: %[[test4_r3:.*]] = load i16* %[[bitcast]]
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds i8* %src, i64 42
+; CHECK-NEXT: %[[test4_r4:.*]] = load i8* %[[gep]]
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds i8* %src, i64 43
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds [7 x i8]* %[[test4_a4]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 7
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds i8* %src, i64 50
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast i8* %[[gep]] to i16*
+; CHECK-NEXT: %[[test4_r5:.*]] = load i16* %[[bitcast]]
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds i8* %src, i64 52
+; CHECK-NEXT: %[[test4_r6:.*]] = load i8* %[[gep]]
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds i8* %src, i64 53
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds [7 x i8]* %[[test4_a5]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 7
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds i8* %src, i64 60
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds [40 x i8]* %[[test4_a6]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 40
+
+  %a.src.1 = getelementptr [100 x i8]* %a, i64 0, i64 20
+  %a.dst.1 = getelementptr [100 x i8]* %a, i64 0, i64 40
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %a.dst.1, i8* %a.src.1, i32 10, i32 1, i1 false)
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds [7 x i8]* %[[test4_a4]], i64 0, i64 0
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds [7 x i8]* %[[test4_a2]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 7
+
+  ; Clobber a single element of the array, this should be promotable, and be deleted.
+  %c = getelementptr [100 x i8]* %a, i64 0, i64 42
+  store i8 0, i8* %c
+
+  %a.src.2 = getelementptr [100 x i8]* %a, i64 0, i64 50
+  call void @llvm.memmove.p0i8.p0i8.i32(i8* %a.dst.1, i8* %a.src.2, i32 10, i32 1, i1 false)
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds [7 x i8]* %[[test4_a4]], i64 0, i64 0
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds [7 x i8]* %[[test4_a5]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 7
+
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dst, i8* %b, i32 100, i32 1, i1 false)
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds [20 x i8]* %[[test4_a1]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dst, i8* %[[gep]], i32 20
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds i8* %dst, i64 20
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast i8* %[[gep]] to i16*
+; CHECK-NEXT: store i16 %[[test4_r1]], i16* %[[bitcast]]
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds i8* %dst, i64 22
+; CHECK-NEXT: store i8 %[[test4_r2]], i8* %[[gep]]
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds i8* %dst, i64 23
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds [7 x i8]* %[[test4_a2]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 7
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds i8* %dst, i64 30
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds [10 x i8]* %[[test4_a3]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 10
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds i8* %dst, i64 40
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast i8* %[[gep]] to i16*
+; CHECK-NEXT: store i16 %[[test4_r5]], i16* %[[bitcast]]
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds i8* %dst, i64 42
+; CHECK-NEXT: store i8 %[[test4_r6]], i8* %[[gep]]
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds i8* %dst, i64 43
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds [7 x i8]* %[[test4_a4]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 7
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds i8* %dst, i64 50
+; CHECK-NEXT: %[[bitcast:.*]] = bitcast i8* %[[gep]] to i16*
+; CHECK-NEXT: store i16 %[[test4_r5]], i16* %[[bitcast]]
+; CHECK-NEXT: %[[gep:.*]] = getelementptr inbounds i8* %dst, i64 52
+; CHECK-NEXT: store i8 %[[test4_r6]], i8* %[[gep]]
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds i8* %dst, i64 53
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds [7 x i8]* %[[test4_a5]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 7
+; CHECK-NEXT: %[[gep_dst:.*]] = getelementptr inbounds i8* %dst, i64 60
+; CHECK-NEXT: %[[gep_src:.*]] = getelementptr inbounds [40 x i8]* %[[test4_a6]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[gep_dst]], i8* %[[gep_src]], i32 40
+
+  ret void
+}
+
+declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
+declare void @llvm.memmove.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
+declare void @llvm.memset.p0i8.i32(i8* nocapture, i8, i32, i32, i1) nounwind
+
+define i16 @test5() {
+; CHECK: @test5
+; CHECK: alloca float
+; CHECK: ret i16 %
+
+entry:
+  %a = alloca [4 x i8]
+  %fptr = bitcast [4 x i8]* %a to float*
+  store float 0.0, float* %fptr
+  %ptr = getelementptr [4 x i8]* %a, i32 0, i32 2
+  %iptr = bitcast i8* %ptr to i16*
+  %val = load i16* %iptr
+  ret i16 %val
+}
+
+define i32 @test6() {
+; CHECK: @test6
+; CHECK: alloca i32
+; CHECK-NEXT: store volatile i32
+; CHECK-NEXT: load i32*
+; CHECK-NEXT: ret i32
+
+entry:
+  %a = alloca [4 x i8]
+  %ptr = getelementptr [4 x i8]* %a, i32 0, i32 0
+  call void @llvm.memset.p0i8.i32(i8* %ptr, i8 42, i32 4, i32 1, i1 true)
+  %iptr = bitcast i8* %ptr to i32*
+  %val = load i32* %iptr
+  ret i32 %val
+}
+
+define void @test7(i8* %src, i8* %dst) {
+; CHECK: @test7
+; CHECK: alloca i32
+; CHECK-NEXT: bitcast i8* %src to i32*
+; CHECK-NEXT: load volatile i32*
+; CHECK-NEXT: store volatile i32
+; CHECK-NEXT: bitcast i8* %dst to i32*
+; CHECK-NEXT: load volatile i32*
+; CHECK-NEXT: store volatile i32
+; CHECK-NEXT: ret
+
+entry:
+  %a = alloca [4 x i8]
+  %ptr = getelementptr [4 x i8]* %a, i32 0, i32 0
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %ptr, i8* %src, i32 4, i32 1, i1 true)
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dst, i8* %ptr, i32 4, i32 1, i1 true)
+  ret void
+}
+
+
+%S1 = type { i32, i32, [16 x i8] }
+%S2 = type { %S1*, %S2* }
+
+define %S2 @test8(%S2* %s2) {
+; CHECK: @test8
+entry:
+  %new = alloca %S2
+; CHECK-NOT: alloca
+
+  %s2.next.ptr = getelementptr %S2* %s2, i64 0, i32 1
+  %s2.next = load %S2** %s2.next.ptr
+; CHECK:      %[[gep:.*]] = getelementptr %S2* %s2, i64 0, i32 1
+; CHECK-NEXT: %[[next:.*]] = load %S2** %[[gep]]
+
+  %s2.next.s1.ptr = getelementptr %S2* %s2.next, i64 0, i32 0
+  %s2.next.s1 = load %S1** %s2.next.s1.ptr
+  %new.s1.ptr = getelementptr %S2* %new, i64 0, i32 0
+  store %S1* %s2.next.s1, %S1** %new.s1.ptr
+  %s2.next.next.ptr = getelementptr %S2* %s2.next, i64 0, i32 1
+  %s2.next.next = load %S2** %s2.next.next.ptr
+  %new.next.ptr = getelementptr %S2* %new, i64 0, i32 1
+  store %S2* %s2.next.next, %S2** %new.next.ptr
+; CHECK-NEXT: %[[gep:.*]] = getelementptr %S2* %[[next]], i64 0, i32 0
+; CHECK-NEXT: %[[next_s1:.*]] = load %S1** %[[gep]]
+; CHECK-NEXT: %[[gep:.*]] = getelementptr %S2* %[[next]], i64 0, i32 1
+; CHECK-NEXT: %[[next_next:.*]] = load %S2** %[[gep]]
+
+  %new.s1 = load %S1** %new.s1.ptr
+  %result1 = insertvalue %S2 undef, %S1* %new.s1, 0
+; CHECK-NEXT: %[[result1:.*]] = insertvalue %S2 undef, %S1* %[[next_s1]], 0
+  %new.next = load %S2** %new.next.ptr
+  %result2 = insertvalue %S2 %result1, %S2* %new.next, 1
+; CHECK-NEXT: %[[result2:.*]] = insertvalue %S2 %[[result1]], %S2* %[[next_next]], 1
+  ret %S2 %result2
+; CHECK-NEXT: ret %S2 %[[result2]]
+}
+
+define i64 @test9() {
+; Ensure we can handle loads off the end of an alloca even when wrapped in
+; weird bit casts and types. The result is undef, but this shouldn't crash
+; anything.
+; CHECK: @test9
+; CHECK-NOT: alloca
+; CHECK: ret i64 undef
+
+entry:
+  %a = alloca { [3 x i8] }
+  %gep1 = getelementptr inbounds { [3 x i8] }* %a, i32 0, i32 0, i32 0
+  store i8 0, i8* %gep1, align 1
+  %gep2 = getelementptr inbounds { [3 x i8] }* %a, i32 0, i32 0, i32 1
+  store i8 0, i8* %gep2, align 1
+  %gep3 = getelementptr inbounds { [3 x i8] }* %a, i32 0, i32 0, i32 2
+  store i8 26, i8* %gep3, align 1
+  %cast = bitcast { [3 x i8] }* %a to { i64 }*
+  %elt = getelementptr inbounds { i64 }* %cast, i32 0, i32 0
+  %result = load i64* %elt
+  ret i64 %result
+}
+
+define %S2* @test10() {
+; CHECK: @test10
+; CHECK-NOT: alloca %S2*
+; CHECK: ret %S2* null
+
+entry:
+  %a = alloca [8 x i8]
+  %ptr = getelementptr [8 x i8]* %a, i32 0, i32 0
+  call void @llvm.memset.p0i8.i32(i8* %ptr, i8 0, i32 8, i32 1, i1 false)
+  %s2ptrptr = bitcast i8* %ptr to %S2**
+  %s2ptr = load %S2** %s2ptrptr
+  ret %S2* %s2ptr
+}
+
+define i32 @test11() {
+; CHECK: @test11
+; CHECK-NOT: alloca
+; CHECK: ret i32 0
+
+entry:
+  %X = alloca i32
+  br i1 undef, label %good, label %bad
+
+good:
+  %Y = getelementptr i32* %X, i64 0
+  store i32 0, i32* %Y
+  %Z = load i32* %Y
+  ret i32 %Z
+
+bad:
+  %Y2 = getelementptr i32* %X, i64 1
+  store i32 0, i32* %Y2
+  %Z2 = load i32* %Y2
+  ret i32 %Z2
+}
+
+define i32 @test12() {
+; CHECK: @test12
+; CHECK: alloca i24
+;
+; FIXME: SROA should promote accesses to this into whole i24 operations instead
+; of i8 operations.
+; CHECK: store i8 0
+; CHECK: store i8 0
+; CHECK: store i8 0
+;
+; CHECK: load i24*
+
+entry:
+  %a = alloca [3 x i8]
+  %b0ptr = getelementptr [3 x i8]* %a, i64 0, i32 0
+  store i8 0, i8* %b0ptr
+  %b1ptr = getelementptr [3 x i8]* %a, i64 0, i32 1
+  store i8 0, i8* %b1ptr
+  %b2ptr = getelementptr [3 x i8]* %a, i64 0, i32 2
+  store i8 0, i8* %b2ptr
+  %iptr = bitcast [3 x i8]* %a to i24*
+  %i = load i24* %iptr
+  %ret = zext i24 %i to i32
+  ret i32 %ret
+}
+
+define i32 @test13() {
+; Ensure we don't crash and handle undefined loads that straddle the end of the
+; allocation.
+; CHECK: @test13
+; CHECK: %[[ret:.*]] = zext i16 undef to i32
+; CHECK: ret i32 %[[ret]]
+
+entry:
+  %a = alloca [3 x i8]
+  %b0ptr = getelementptr [3 x i8]* %a, i64 0, i32 0
+  store i8 0, i8* %b0ptr
+  %b1ptr = getelementptr [3 x i8]* %a, i64 0, i32 1
+  store i8 0, i8* %b1ptr
+  %b2ptr = getelementptr [3 x i8]* %a, i64 0, i32 2
+  store i8 0, i8* %b2ptr
+  %iptrcast = bitcast [3 x i8]* %a to i16*
+  %iptrgep = getelementptr i16* %iptrcast, i64 1
+  %i = load i16* %iptrgep
+  %ret = zext i16 %i to i32
+  ret i32 %ret
+}
+
+%test14.struct = type { [3 x i32] }
+
+define void @test14(...) nounwind uwtable {
+; This is a strange case where we split allocas into promotable partitions, but
+; also gain enough data to prove they must be dead allocas due to GEPs that walk
+; across two adjacent allocas. Test that we don't try to promote or otherwise
+; do bad things to these dead allocas, they should just be removed.
+; CHECK: @test14
+; CHECK-NEXT: entry:
+; CHECK-NEXT: ret void
+
+entry:
+  %a = alloca %test14.struct
+  %p = alloca %test14.struct*
+  %0 = bitcast %test14.struct* %a to i8*
+  %1 = getelementptr i8* %0, i64 12
+  %2 = bitcast i8* %1 to %test14.struct*
+  %3 = getelementptr inbounds %test14.struct* %2, i32 0, i32 0
+  %4 = getelementptr inbounds %test14.struct* %a, i32 0, i32 0
+  %5 = bitcast [3 x i32]* %3 to i32*
+  %6 = bitcast [3 x i32]* %4 to i32*
+  %7 = load i32* %6, align 4
+  store i32 %7, i32* %5, align 4
+  %8 = getelementptr inbounds i32* %5, i32 1
+  %9 = getelementptr inbounds i32* %6, i32 1
+  %10 = load i32* %9, align 4
+  store i32 %10, i32* %8, align 4
+  %11 = getelementptr inbounds i32* %5, i32 2
+  %12 = getelementptr inbounds i32* %6, i32 2
+  %13 = load i32* %12, align 4
+  store i32 %13, i32* %11, align 4
+  ret void
+}
+
+define i32 @test15(i1 %flag) nounwind uwtable {
+; Ensure that when there are dead instructions using an alloca that are not
+; loads or stores we still delete them during partitioning and rewriting.
+; Otherwise we'll go to promote them while thy still have unpromotable uses.
+; CHECK: @test15
+; CHECK-NEXT: entry:
+; CHECK-NEXT:   br label %loop
+; CHECK:      loop:
+; CHECK-NEXT:   br label %loop
+
+entry:
+  %l0 = alloca i64
+  %l1 = alloca i64
+  %l2 = alloca i64
+  %l3 = alloca i64
+  br label %loop
+
+loop:
+  %dead3 = phi i8* [ %gep3, %loop ], [ null, %entry ]
+
+  store i64 1879048192, i64* %l0, align 8
+  %bc0 = bitcast i64* %l0 to i8*
+  %gep0 = getelementptr i8* %bc0, i64 3
+  %dead0 = bitcast i8* %gep0 to i64*
+
+  store i64 1879048192, i64* %l1, align 8
+  %bc1 = bitcast i64* %l1 to i8*
+  %gep1 = getelementptr i8* %bc1, i64 3
+  %dead1 = getelementptr i8* %gep1, i64 1
+
+  store i64 1879048192, i64* %l2, align 8
+  %bc2 = bitcast i64* %l2 to i8*
+  %gep2.1 = getelementptr i8* %bc2, i64 1
+  %gep2.2 = getelementptr i8* %bc2, i64 3
+  ; Note that this select should get visited multiple times due to using two
+  ; different GEPs off the same alloca. We should only delete it once.
+  %dead2 = select i1 %flag, i8* %gep2.1, i8* %gep2.2
+
+  store i64 1879048192, i64* %l3, align 8
+  %bc3 = bitcast i64* %l3 to i8*
+  %gep3 = getelementptr i8* %bc3, i64 3
+
+  br label %loop
+}
+
+define void @test16(i8* %src, i8* %dst) {
+; Ensure that we can promote an alloca of [3 x i8] to an i24 SSA value.
+; CHECK: @test16
+; CHECK-NOT: alloca
+; CHECK:      %[[srccast:.*]] = bitcast i8* %src to i24*
+; CHECK-NEXT: load i24* %[[srccast]]
+; CHECK-NEXT: %[[dstcast:.*]] = bitcast i8* %dst to i24*
+; CHECK-NEXT: store i24 0, i24* %[[dstcast]]
+; CHECK-NEXT: ret void
+
+entry:
+  %a = alloca [3 x i8]
+  %ptr = getelementptr [3 x i8]* %a, i32 0, i32 0
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %ptr, i8* %src, i32 4, i32 1, i1 false)
+  %cast = bitcast i8* %ptr to i24*
+  store i24 0, i24* %cast
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dst, i8* %ptr, i32 4, i32 1, i1 false)
+  ret void
+}
+
+define void @test17(i8* %src, i8* %dst) {
+; Ensure that we can rewrite unpromotable memcpys which extend past the end of
+; the alloca.
+; CHECK: @test17
+; CHECK:      %[[a:.*]] = alloca [3 x i8]
+; CHECK-NEXT: %[[ptr:.*]] = getelementptr [3 x i8]* %[[a]], i32 0, i32 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[ptr]], i8* %src,
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dst, i8* %[[ptr]],
+; CHECK-NEXT: ret void
+
+entry:
+  %a = alloca [3 x i8]
+  %ptr = getelementptr [3 x i8]* %a, i32 0, i32 0
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %ptr, i8* %src, i32 4, i32 1, i1 true)
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dst, i8* %ptr, i32 4, i32 1, i1 true)
+  ret void
+}
+
+define void @test18(i8* %src, i8* %dst, i32 %size) {
+; Preserve transfer instrinsics with a variable size, even if they overlap with
+; fixed size operations. Further, continue to split and promote allocas preceding
+; the variable sized intrinsic.
+; CHECK: @test18
+; CHECK:      %[[a:.*]] = alloca [34 x i8]
+; CHECK:      %[[srcgep1:.*]] = getelementptr inbounds i8* %src, i64 4
+; CHECK-NEXT: %[[srccast1:.*]] = bitcast i8* %[[srcgep1]] to i32*
+; CHECK-NEXT: %[[srcload:.*]] = load i32* %[[srccast1]]
+; CHECK-NEXT: %[[agep1:.*]] = getelementptr inbounds [34 x i8]* %[[a]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[agep1]], i8* %src, i32 %size,
+; CHECK-NEXT: %[[agep2:.*]] = getelementptr inbounds [34 x i8]* %[[a]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* %[[agep2]], i8 42, i32 %size,
+; CHECK-NEXT: %[[dstcast1:.*]] = bitcast i8* %dst to i32*
+; CHECK-NEXT: store i32 42, i32* %[[dstcast1]]
+; CHECK-NEXT: %[[dstgep1:.*]] = getelementptr inbounds i8* %dst, i64 4
+; CHECK-NEXT: %[[dstcast2:.*]] = bitcast i8* %[[dstgep1]] to i32*
+; CHECK-NEXT: store i32 %[[srcload]], i32* %[[dstcast2]]
+; CHECK-NEXT: %[[agep3:.*]] = getelementptr inbounds [34 x i8]* %[[a]], i64 0, i64 0
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dst, i8* %[[agep3]], i32 %size,
+; CHECK-NEXT: ret void
+
+entry:
+  %a = alloca [42 x i8]
+  %ptr = getelementptr [42 x i8]* %a, i32 0, i32 0
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %ptr, i8* %src, i32 8, i32 1, i1 false)
+  %ptr2 = getelementptr [42 x i8]* %a, i32 0, i32 8
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %ptr2, i8* %src, i32 %size, i32 1, i1 false)
+  call void @llvm.memset.p0i8.i32(i8* %ptr2, i8 42, i32 %size, i32 1, i1 false)
+  %cast = bitcast i8* %ptr to i32*
+  store i32 42, i32* %cast
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dst, i8* %ptr, i32 8, i32 1, i1 false)
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dst, i8* %ptr2, i32 %size, i32 1, i1 false)
+  ret void
+}
+