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; RUN: opt -mem2reg -S -o - < %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"
declare void @llvm.lifetime.start(i64 %size, i8* nocapture %ptr)
declare void @llvm.lifetime.end(i64 %size, i8* nocapture %ptr)
define void @test1() {
; Ensure we can look through a bitcast to i8* and the addition of lifetime
; markers.
;
; CHECK-LABEL: @test1(
; CHECK-NOT: alloca
; CHECK: ret void
%A = alloca i32
%B = bitcast i32* %A to i8*
call void @llvm.lifetime.start(i64 2, i8* %B)
store i32 1, i32* %A
call void @llvm.lifetime.end(i64 2, i8* %B)
ret void
}
define void @test2() {
; Ensure we can look through a GEP to i8* and the addition of lifetime
; markers.
;
; CHECK-LABEL: @test2(
; CHECK-NOT: alloca
; CHECK: ret void
%A = alloca {i8, i16}
%B = getelementptr {i8, i16}* %A, i32 0, i32 0
call void @llvm.lifetime.start(i64 2, i8* %B)
store {i8, i16} zeroinitializer, {i8, i16}* %A
call void @llvm.lifetime.end(i64 2, i8* %B)
ret void
}
define i32 @test3(i32 %x) {
; CHECK-LABEL: @test3(
;
; Check that we recursively walk the uses of the alloca and thus can see
; through round trip bitcasts, dead bitcasts, GEPs, multiple GEPs, and lifetime
; markers.
entry:
%a = alloca i32
; CHECK-NOT: alloca
%b = bitcast i32* %a to i8*
%b2 = getelementptr inbounds i8* %b, i32 0
%b3 = getelementptr inbounds i8* %b2, i32 0
call void @llvm.lifetime.start(i64 -1, i8* %b3)
; CHECK-NOT: call void @llvm.lifetime.start
store i32 %x, i32* %a
; CHECK-NOT: store
%dead = bitcast i32* %a to i4096*
%dead1 = bitcast i4096* %dead to i42*
%dead2 = getelementptr inbounds i32* %a, i32 %x
; CHECK-NOT: bitcast
; CHECK-NOT: getelementptr
%ret = load i32* %a
; CHECK-NOT: load
ret i32 %ret
; CHECK: ret i32 %x
}
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