; RUN: opt < %s -basicaa -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.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind
+declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) nounwind
+declare void @llvm.memset.i64(i8*, i8, i64, i32)
+declare void @llvm.memcpy.i64(i8*, i8*, i64, i32)
+declare i8* @llvm.init.trampoline(i8*, i8*, i8*)
+
define void @test1(i32* %Q, i32* %P) {
%DEAD = load i32* %Q
store i32 %DEAD, i32* %P
%tmp3 = load i32* @g, align 4
ret i32 %tmp3
}
+
+
+define void @test4(i32* %Q) {
+ %a = load i32* %Q
+ volatile store i32 %a, i32* %Q
+ ret void
+; CHECK: @test4
+; CHECK-NEXT: load i32
+; CHECK-NEXT: volatile store
+; CHECK-NEXT: ret void
+}
+
+define void @test5(i32* %Q) {
+ %a = volatile load i32* %Q
+ store i32 %a, i32* %Q
+ ret void
+; CHECK: @test5
+; CHECK-NEXT: volatile load
+; CHECK-NEXT: ret void
+}
+
+; Should delete store of 10 even though memset is a may-store to P (P and Q may
+; alias).
+define void @test6(i32 *%p, i8 *%q) {
+ store i32 10, i32* %p, align 4 ;; dead.
+ call void @llvm.memset.i64(i8* %q, i8 42, i64 900, i32 1)
+ store i32 30, i32* %p, align 4
+ ret void
+; CHECK: @test6
+; CHECK-NEXT: call void @llvm.memset
+}
+
+; Should delete store of 10 even though memcpy is a may-store to P (P and Q may
+; alias).
+define void @test7(i32 *%p, i8 *%q, i8* noalias %r) {
+ store i32 10, i32* %p, align 4 ;; dead.
+ call void @llvm.memcpy.i64(i8* %q, i8* %r, i64 900, i32 1)
+ store i32 30, i32* %p, align 4
+ ret void
+; CHECK: @test7
+; CHECK-NEXT: call void @llvm.memcpy
+}
+
+; Do not delete stores that are only partially killed.
+define i32 @test8() {
+ %V = alloca i32
+ store i32 1234567, i32* %V
+ %V2 = bitcast i32* %V to i8*
+ store i8 0, i8* %V2
+ %X = load i32* %V
+ ret i32 %X
+
+; CHECK: @test8
+; CHECK: store i32 1234567
+}
+
+
+; Test for byval handling.
+%struct.x = type { i32, i32, i32, i32 }
+define void @test9(%struct.x* byval %a) nounwind {
+ %tmp2 = getelementptr %struct.x* %a, i32 0, i32 0
+ store i32 1, i32* %tmp2, align 4
+ ret void
+; CHECK: @test9
+; CHECK-NEXT: ret void
+}
+
+; va_arg has fuzzy dependence, the store shouldn't be zapped.
+define double @test10(i8* %X) {
+ %X_addr = alloca i8*
+ store i8* %X, i8** %X_addr
+ %tmp.0 = va_arg i8** %X_addr, double
+ ret double %tmp.0
+; CHECK: @test10
+; CHECK: store
+}
+
+
+; DSE should delete the dead trampoline.
+declare void @test11f()
+define void @test11() {
+; CHECK: @test11
+ %storage = alloca [10 x i8], align 16 ; <[10 x i8]*> [#uses=1]
+; CHECK-NOT: alloca
+ %cast = getelementptr [10 x i8]* %storage, i32 0, i32 0 ; <i8*> [#uses=1]
+ %tramp = call i8* @llvm.init.trampoline( i8* %cast, i8* bitcast (void ()* @test11f to i8*), i8* null ) ; <i8*> [#uses=1]
+; CHECK-NOT: trampoline
+ ret void
+; CHECK: ret void
+}
+
+
+; PR2599 - load -> store to same address.
+define void @test12({ i32, i32 }* %x) nounwind {
+ %tmp4 = getelementptr { i32, i32 }* %x, i32 0, i32 0
+ %tmp5 = load i32* %tmp4, align 4
+ %tmp7 = getelementptr { i32, i32 }* %x, i32 0, i32 1
+ %tmp8 = load i32* %tmp7, align 4
+ %tmp17 = sub i32 0, %tmp8
+ store i32 %tmp5, i32* %tmp4, align 4
+ store i32 %tmp17, i32* %tmp7, align 4
+ ret void
+; CHECK: @test12
+; CHECK-NOT: tmp5
+; CHECK: ret void
+}
+
+
+; %P doesn't escape, the DEAD instructions should be removed.
+declare void @test13f()
+define i32* @test13() {
+ %p = tail call i8* @malloc(i32 4)
+ %P = bitcast i8* %p to i32*
+ %DEAD = load i32* %P
+ %DEAD2 = add i32 %DEAD, 1
+ store i32 %DEAD2, i32* %P
+ call void @test13f( )
+ store i32 0, i32* %P
+ ret i32* %P
+; CHECK: @test13()
+; CHECK-NEXT: malloc
+; CHECK-NEXT: bitcast
+; CHECK-NEXT: call void
+}
+
+declare noalias i8* @malloc(i32)
+
+
+
+define void @test14(i32* %Q) {
+ %P = alloca i32
+ %DEAD = load i32* %Q
+ store i32 %DEAD, i32* %P
+ ret void
+
+; CHECK: @test14
+; CHECK-NEXT: ret void
+}
+
+
+; PR8701
+
+;; Fully dead overwrite of memcpy.
+define void @test15(i8* %P, i8* %Q) nounwind ssp {
+ tail call void @llvm.memcpy.i64(i8* %P, i8* %Q, i64 12, i32 1)
+ tail call void @llvm.memcpy.i64(i8* %P, i8* %Q, i64 12, i32 1)
+ ret void
+; CHECK: @test15
+; CHECK-NEXT: call void @llvm.memcpy
+; CHECK-NEXT: ret
+}
+
+;; Full overwrite of smaller memcpy.
+define void @test16(i8* %P, i8* %Q) nounwind ssp {
+ tail call void @llvm.memcpy.i64(i8* %P, i8* %Q, i64 8, i32 1)
+ tail call void @llvm.memcpy.i64(i8* %P, i8* %Q, i64 12, i32 1)
+ ret void
+; CHECK: @test16
+; CHECK-NEXT: call void @llvm.memcpy
+; CHECK-NEXT: ret
+}
+
+;; Overwrite of memset by memcpy.
+define void @test17(i8* %P, i8* noalias %Q) nounwind ssp {
+ tail call void @llvm.memset.i64(i8* %P, i8 42, i64 8, i32 1)
+ tail call void @llvm.memcpy.i64(i8* %P, i8* %Q, i64 12, i32 1)
+ ret void
+; CHECK: @test17
+; CHECK-NEXT: call void @llvm.memcpy
+; CHECK-NEXT: ret
+}
+
+; Should not delete the volatile memset.
+define void @test17v(i8* %P, i8* %Q) nounwind ssp {
+ tail call void @llvm.memset.p0i8.i64(i8* %P, i8 42, i64 8, i32 1, i1 true)
+ tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %P, i8* %Q, i64 12, i32 1, i1 false)
+ ret void
+; CHECK: @test17v
+; CHECK-NEXT: call void @llvm.memset
+; CHECK-NEXT: call void @llvm.memcpy
+; CHECK-NEXT: ret
+}
+
+; PR8728
+; Do not delete instruction where possible situation is:
+; A = B
+; A = A
+define void @test18(i8* %P, i8* %Q, i8* %R) nounwind ssp {
+ tail call void @llvm.memcpy.i64(i8* %P, i8* %Q, i64 12, i32 1)
+ tail call void @llvm.memcpy.i64(i8* %P, i8* %R, i64 12, i32 1)
+ ret void
+; CHECK: @test18
+; CHECK-NEXT: call void @llvm.memcpy
+; CHECK-NEXT: call void @llvm.memcpy
+; CHECK-NEXT: ret
+}
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