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[MemCpyOpt] Add lifetime may alias test (NFC) 

Test the case where a lifetime intrinsic may alias the memcpy
source. Other cases test must or no alias.
This commit is contained in:
Nikita Popov 2020-10-11 17:07:28 +02:00
parent 8f2cacae67
commit d7186fe371
1 changed files with 13 additions and 4 deletions
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17
llvm/test/Transforms/MemCpyOpt/memcpy-undef.ll
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@ -6,6 +6,7 @@ target triple = "x86_64-apple-macosx10.8.0"
%struct.foo = type { i8, [7 x i8], i32 }
; Check that the memcpy is removed.
define i32 @test1(%struct.foo* nocapture %foobie) nounwind noinline ssp uwtable {
; CHECK-LABEL: @test1(
; CHECK-NEXT: [[BLETCH_SROA_1:%.*]] = alloca [7 x i8], align 1
@ -26,10 +27,9 @@ define i32 @test1(%struct.foo* nocapture %foobie) nounwind noinline ssp uwtable
%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 that the memcpy is removed.
define void @test2(i8* sret noalias nocapture %out, i8* %in) nounwind noinline ssp uwtable {
; CHECK-LABEL: @test2(
; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 8, i8* [[IN:%.*]])
@ -38,10 +38,9 @@ define void @test2(i8* sret noalias nocapture %out, i8* %in) nounwind noinline s
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 that the memcpy is not removed.
define void @test3(i8* sret noalias nocapture %out, i8* %in) nounwind noinline ssp uwtable {
; CHECK-LABEL: @test3(
; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 4, i8* [[IN:%.*]])
@ -51,8 +50,18 @@ define void @test3(i8* sret noalias nocapture %out, i8* %in) nounwind noinline s
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.
define void @test_lifetime_may_alias(i8* %lifetime, i8* %src, i8* %dst) {
; CHECK-LABEL: @test_lifetime_may_alias(
; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 8, i8* [[LIFETIME:%.*]])
; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[DST:%.*]], i8* [[SRC:%.*]], i64 8, i1 false)
; CHECK-NEXT: ret void
;
call void @llvm.lifetime.start.p0i8(i64 8, i8* %lifetime)
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %dst, i8* %src, i64 8, i1 false)
ret void
}
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1) nounwind