memcpy-undef.ll
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; RUN: opt < %s -basicaa -memcpyopt -S | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.8.0"
%struct.foo = type { i8, [7 x i8], i32 }
define i32 @test1(%struct.foo* nocapture %foobie) nounwind noinline ssp uwtable {
%bletch.sroa.1 = alloca [7 x i8], align 1
%1 = getelementptr inbounds %struct.foo, %struct.foo* %foobie, i64 0, i32 0
store i8 98, i8* %1, align 4
%2 = getelementptr inbounds %struct.foo, %struct.foo* %foobie, i64 0, i32 1, i64 0
%3 = getelementptr inbounds [7 x i8], [7 x i8]* %bletch.sroa.1, i64 0, i64 0
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %2, i8* %3, i64 7, i1 false)
%4 = getelementptr inbounds %struct.foo, %struct.foo* %foobie, i64 0, i32 2
store i32 20, i32* %4, align 4
ret i32 undef
; Check that the memcpy is removed.
; CHECK-LABEL: @test1(
; CHECK-NOT: call void @llvm.memcpy
}
define void @test2(i8* sret noalias nocapture %out, i8* %in) nounwind noinline ssp uwtable {
call void @llvm.lifetime.start.p0i8(i64 8, i8* %in)
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %out, i8* %in, i64 8, i1 false)
ret void
; Check that the memcpy is removed.
; CHECK-LABEL: @test2(
; CHECK-NOT: call void @llvm.memcpy
}
define void @test3(i8* sret noalias nocapture %out, i8* %in) nounwind noinline ssp uwtable {
call void @llvm.lifetime.start.p0i8(i64 4, i8* %in)
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %out, i8* %in, i64 8, i1 false)
ret void
; Check that the memcpy is not removed.
; CHECK-LABEL: @test3(
; CHECK: call void @llvm.memcpy
}
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1) nounwind
declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) nounwind