The BLX instruction is encoded differently than the BL, because why not? In

[oota-llvm.git] / test / Analysis / BasicAA / modref.ll

diff --git a/test/Analysis/BasicAA/modref.ll b/test/Analysis/BasicAA/modref.ll
index b3d93acf55e6d457f8fd43e350b1c9c9fa8f9341..54d10e7b72dfdaae9b5272413ac88f952c9cb8b2 100644 (file)
--- a/test/Analysis/BasicAA/modref.ll
+++ b/test/Analysis/BasicAA/modref.ll
@@ -1,8 +1,10 @@
 ; RUN: opt < %s -basicaa -gvn -dse -S | FileCheck %s
+target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
 
 declare void @llvm.memset.i32(i8*, i8, i32, i32)
 declare void @llvm.memset.i8(i8*, i8, i8, i32)
 declare void @llvm.memcpy.i8(i8*, i8*, i8, i32)
+declare void @llvm.memcpy.i32(i8*, i8*, i32, i32)
 declare void @llvm.lifetime.end(i64, i8* nocapture)
 
 declare void @external(i32*) 
@@ -40,7 +42,7 @@ define i8 @test1() {
 
 define i8 @test2(i8* %P) {
 ; CHECK: @test2
-  %P2 = getelementptr i8* %P, i32 1000
+  %P2 = getelementptr i8* %P, i32 127
   store i8 1, i8* %P2  ;; Not dead across memset
   call void @llvm.memset.i8(i8* %P, i8 2, i8 127, i32 0)
   %A = load i8* %P2
@@ -48,14 +50,87 @@ define i8 @test2(i8* %P) {
 ; CHECK: ret i8 1
 }
 
-define void @test3(i8* %P) {
+define i8 @test2a(i8* %P) {
+; CHECK: @test2
+  %P2 = getelementptr i8* %P, i32 126
+  
+  ;; FIXME: DSE isn't zapping this dead store.
+  store i8 1, i8* %P2  ;; Dead, clobbered by memset.
+  
+  call void @llvm.memset.i8(i8* %P, i8 2, i8 127, i32 0)
+  %A = load i8* %P2
+  ret i8 %A
+; CHECK-NOT: load
+; CHECK: ret i8 2
+}
+
+define void @test3(i8* %P, i8 %X) {
 ; CHECK: @test3
+; CHECK-NOT: store
+; CHECK-NOT: %Y
+  %Y = add i8 %X, 1     ;; Dead, because the only use (the store) is dead.
+  
   %P2 = getelementptr i8* %P, i32 2
-  store i8 1, i8* %P2  ;; Not read by lifetime.end
-; CHECK: store
+  store i8 %Y, i8* %P2  ;; Not read by lifetime.end, should be removed.
+; CHECK: store i8 2, i8* %P2
   call void @llvm.lifetime.end(i64 1, i8* %P)
   store i8 2, i8* %P2
 ; CHECK-NOT: store
   ret void
 ; CHECK: ret void
-}
\ No newline at end of file
+}
+
+define void @test3a(i8* %P, i8 %X) {
+; CHECK: @test3a
+  %Y = add i8 %X, 1     ;; Dead, because the only use (the store) is dead.
+  
+  %P2 = getelementptr i8* %P, i32 2
+  store i8 %Y, i8* %P2
+; CHECK-NEXT: call void @llvm.lifetime.end
+  call void @llvm.lifetime.end(i64 10, i8* %P)
+  ret void
+; CHECK-NEXT: ret void
+}
+
+@G1 = external global i32
+@G2 = external global [4000 x i32]
+
+define i32 @test4(i8* %P) {
+  %tmp = load i32* @G1
+  call void @llvm.memset.i32(i8* bitcast ([4000 x i32]* @G2 to i8*), i8 0, i32 4000, i32 1)
+  %tmp2 = load i32* @G1
+  %sub = sub i32 %tmp2, %tmp
+  ret i32 %sub
+; CHECK: @test4
+; CHECK: load i32* @G
+; CHECK: memset.p0i8.i32
+; CHECK-NOT: load
+; CHECK: sub i32 %tmp, %tmp
+}
+
+; Verify that basicaa is handling variable length memcpy, knowing it doesn't
+; write to G1.
+define i32 @test5(i8* %P, i32 %Len) {
+  %tmp = load i32* @G1
+  call void @llvm.memcpy.i32(i8* bitcast ([4000 x i32]* @G2 to i8*), i8* bitcast (i32* @G1 to i8*), i32 %Len, i32 1)
+  %tmp2 = load i32* @G1
+  %sub = sub i32 %tmp2, %tmp
+  ret i32 %sub
+; CHECK: @test5
+; CHECK: load i32* @G
+; CHECK: memcpy.p0i8.p0i8.i32
+; CHECK-NOT: load
+; CHECK: sub i32 %tmp, %tmp
+}
+
+define i8 @test6(i8* %p, i8* noalias %a) {
+  %x = load i8* %a
+  %t = va_arg i8* %p, float
+  %y = load i8* %a
+  %z = add i8 %x, %y
+  ret i8 %z
+; CHECK: @test6
+; CHECK: load i8* %a
+; CHECK-NOT: load
+; CHECK: ret
+}