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llvm-mirror/test/Transforms/LICM/argmemonly-call.ll
Alina Sbirlea 1542bebc55 [LoopPassManager + MemorySSA] Only enable use of MemorySSA for LPMs known to preserve it. 
Summary:
Add a flag to the FunctionToLoopAdaptor that allows enabling MemorySSA only for the loop pass managers that are known to preserve it.

If an LPM is known to have only loop transforms that *all* preserve MemorySSA, then use MemorySSA if `EnableMSSALoopDependency` is set.
If an LPM has loop passes that do not preserve MemorySSA, then the flag passed is `false`, regardless of the value of `EnableMSSALoopDependency`.

When using a custom loop pass pipeline via `passes=...`, use keyword `loop` vs `loop-mssa` to use MemorySSA in that LPM. If a loop that does not preserve MemorySSA is added while using the `loop-mssa` keyword, that's an error.

Add the new `loop-mssa` keyword to a few tests where a difference occurs when enabling MemorySSA.

Reviewers: chandlerc

Subscribers: mehdi_amini, Prazek, george.burgess.iv, sanjoy.google, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D66376

llvm-svn: 369548
2019-08-21 17:00:57 +00:00

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; RUN: opt -S -basicaa -licm -licm-n2-threshold=0 -enable-mssa-loop-dependency=false %s | FileCheck %s
; RUN: opt -S -basicaa -licm -licm-n2-threshold=0 -enable-mssa-loop-dependency=true -verify-memoryssa %s | FileCheck %s --check-prefix=ALIAS-N2
; RUN: opt -licm -basicaa -licm-n2-threshold=200 < %s -S | FileCheck %s --check-prefix=ALIAS-N2
; RUN: opt -aa-pipeline=basic-aa -licm-n2-threshold=0 -passes='require<aa>,require<targetir>,require<scalar-evolution>,require<opt-remark-emit>,loop(licm)' < %s -S | FileCheck %s
; RUN: opt -aa-pipeline=basic-aa -licm-n2-threshold=0 -passes='require<aa>,require<targetir>,require<scalar-evolution>,require<opt-remark-emit>,loop-mssa(licm)' < %s -S | FileCheck %s --check-prefix=ALIAS-N2
; RUN: opt -aa-pipeline=basic-aa -licm-n2-threshold=200 -passes='require<aa>,require<targetir>,require<scalar-evolution>,require<opt-remark-emit>,loop(licm)' < %s -S | FileCheck %s --check-prefix=ALIAS-N2
declare i32 @foo() readonly argmemonly nounwind
declare i32 @foo2() readonly nounwind
declare i32 @bar(i32* %loc2) readonly argmemonly nounwind
define void @test(i32* %loc) {
; CHECK-LABEL: @test
; CHECK: @foo
; CHECK-LABEL: loop:
; ALIAS-N2-LABEL: @test
; ALIAS-N2: @foo
; ALIAS-N2-LABEL: loop:
br label %loop
loop:
%res = call i32 @foo()
store i32 %res, i32* %loc
br label %loop
}
; Negative test: show argmemonly is required
define void @test_neg(i32* %loc) {
; CHECK-LABEL: @test_neg
; CHECK-LABEL: loop:
; CHECK: @foo
; ALIAS-N2-LABEL: @test_neg
; ALIAS-N2-LABEL: loop:
; ALIAS-N2: @foo
br label %loop
loop:
%res = call i32 @foo2()
store i32 %res, i32* %loc
br label %loop
}
define void @test2(i32* noalias %loc, i32* noalias %loc2) {
; CHECK-LABEL: @test2
; CHECK: @bar
; CHECK-LABEL: loop:
; ALIAS-N2-LABEL: @test2
; ALIAS-N2: @bar
; ALIAS-N2-LABEL: loop:
br label %loop
loop:
%res = call i32 @bar(i32* %loc2)
store i32 %res, i32* %loc
br label %loop
}
; Negative test: %might clobber gep
define void @test3(i32* %loc) {
; CHECK-LABEL: @test3
; CHECK-LABEL: loop:
; CHECK: @bar
; ALIAS-N2-LABEL: @test3
; ALIAS-N2-LABEL: loop:
; ALIAS-N2: @bar
br label %loop
loop:
%res = call i32 @bar(i32* %loc)
%gep = getelementptr i32, i32 *%loc, i64 1000000
store i32 %res, i32* %gep
br label %loop
}
; Negative test: %loc might alias %loc2
define void @test4(i32* %loc, i32* %loc2) {
; CHECK-LABEL: @test4
; CHECK-LABEL: loop:
; CHECK: @bar
; ALIAS-N2-LABEL: @test4
; ALIAS-N2-LABEL: loop:
; ALIAS-N2: @bar
br label %loop
loop:
%res = call i32 @bar(i32* %loc2)
store i32 %res, i32* %loc
br label %loop
}
declare i32 @foo_new(i32*) readonly
; With the default AST mechanism used by LICM for alias analysis,
; we clump foo_new with bar.
; With the N2 Alias analysis diagnostic tool, we are able to hoist the
; argmemonly bar call out of the loop.
; Using MemorySSA we can also hoist bar.
define void @test5(i32* %loc2, i32* noalias %loc) {
; ALIAS-N2-LABEL: @test5
; ALIAS-N2: @bar
; ALIAS-N2-LABEL: loop:
; CHECK-LABEL: @test5
; CHECK-LABEL: loop:
; CHECK: @bar
br label %loop
loop:
%res1 = call i32 @bar(i32* %loc2)
%res = call i32 @foo_new(i32* %loc2)
store volatile i32 %res1, i32* %loc
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
; ALIAS-N2-LABEL: @test6
; ALIAS-N2: %val = load i32, i32* %loc2
; ALIAS-N2-LABEL: loop:
; ALIAS-N2: @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
}
define void @test7(i32* noalias %loc, i32* noalias %loc2) {
; CHECK-LABEL: @test7
; CHECK: %val = load i32, i32* %loc2
; CHECK-LABEL: loop:
; CHECK: @custom_memcpy
; ALIAS-N2-LABEL: @test7
; ALIAS-N2: %val = load i32, i32* %loc2
; ALIAS-N2-LABEL: loop:
; ALIAS-N2: @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
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