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[LICM][NFC] Add tests from D50730 

Landing tests so corresponding change can show effects clearly.  see
D50730 [AST] Generalize argument specific aliasing

llvm-svn: 340243
This commit is contained in:
Philip Reames 2018-08-21 00:37:09 +00:00
parent 4009487e5c
commit efdd0a426a
1 changed files with 38 additions and 0 deletions
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38
llvm/test/Transforms/LICM/argmemonly-call.ll
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@ -95,3 +95,41 @@ loop:
br label %loop
}
; memcpy doesn't write to it's source argument, so loads to that location
; can still be hoisted
define void @test6(i32* noalias %loc, i32* noalias %loc2) {
; CHECK-LABEL: @test6
; CHECK: %val = load i32, i32* %loc2
; CHECK-LABEL: loop:
; CHECK: @llvm.memcpy
br label %loop
loop:
%val = load i32, i32* %loc2
store i32 %val, i32* %loc
%dest = bitcast i32* %loc to i8*
%src = bitcast i32* %loc2 to i8*
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %dest, i8* %src, i64 8, i1 false)
br label %loop
}
; FIXME: argument aliasing should let us do this transform
define void @test7(i32* noalias %loc, i32* noalias %loc2) {
; CHECK-LABEL: @test7
; CHECK-LABEL: loop:
; CHECK: %val = load i32, i32* %loc2
; CHECK: @custom_memcpy
br label %loop
loop:
%val = load i32, i32* %loc2
store i32 %val, i32* %loc
%dest = bitcast i32* %loc to i8*
%src = bitcast i32* %loc2 to i8*
call void @custom_memcpy(i8* %dest, i8* %src)
br label %loop
}
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture writeonly, i8* nocapture readonly, i64, i1)
declare void @custom_memcpy(i8* nocapture writeonly, i8* nocapture readonly) argmemonly nounwind