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1542bebc55
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
89 lines
2.9 KiB
LLVM
89 lines
2.9 KiB
LLVM
; RUN: opt -S -basicaa -licm -licm-n2-threshold=0 -enable-mssa-loop-dependency=false %s | FileCheck %s
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; RUN: opt -S -basicaa -licm -licm-n2-threshold=0 -enable-mssa-loop-dependency=true %s | FileCheck %s --check-prefix=ALIAS-N2
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; RUN: opt -licm -basicaa -licm-n2-threshold=200 < %s -S | FileCheck %s --check-prefix=ALIAS-N2
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; 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
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; 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
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; 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
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; We should be able to hoist loads in presence of read only calls and stores
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; that do not alias.
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; Since LICM uses the AST mechanism for alias analysis, we will clump
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; together all loads and stores in one set along with the read-only call.
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; This prevents hoisting load that doesn't alias with any other memory
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; operations.
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declare void @foo(i64, i32*) readonly
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; hoist the load out with the n2-threshold
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; since it doesn't alias with the store.
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; default AST mechanism clumps all memory locations in one set because of the
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; readonly call
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define void @test1(i32* %ptr) {
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; CHECK-LABEL: @test1(
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; CHECK-LABEL: entry:
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; CHECK-LABEL: loop:
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; CHECK: %val = load i32, i32* %ptr
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; ALIAS-N2-LABEL: @test1(
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; ALIAS-N2-LABEL: entry:
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; ALIAS-N2: %val = load i32, i32* %ptr
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; ALIAS-N2-LABEL: loop:
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entry:
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br label %loop
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loop:
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%x = phi i32 [ 0, %entry ], [ %x.inc, %loop ]
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%val = load i32, i32* %ptr
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call void @foo(i64 4, i32* %ptr)
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%p2 = getelementptr i32, i32* %ptr, i32 1
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store volatile i32 0, i32* %p2
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%x.inc = add i32 %x, %val
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br label %loop
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}
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; can hoist out load with the default AST and the alias analysis mechanism.
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define void @test2(i32* %ptr) {
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; CHECK-LABEL: @test2(
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; CHECK-LABEL: entry:
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; CHECK: %val = load i32, i32* %ptr
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; CHECK-LABEL: loop:
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; ALIAS-N2-LABEL: @test2(
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; ALIAS-N2-LABEL: entry:
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; ALIAS-N2: %val = load i32, i32* %ptr
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; ALIAS-N2-LABEL: loop:
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entry:
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br label %loop
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loop:
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%x = phi i32 [ 0, %entry ], [ %x.inc, %loop ]
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%val = load i32, i32* %ptr
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call void @foo(i64 4, i32* %ptr)
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%x.inc = add i32 %x, %val
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br label %loop
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}
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; cannot hoist load since not guaranteed to execute
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define void @test3(i32* %ptr) {
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; CHECK-LABEL: @test3(
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; CHECK-LABEL: entry:
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; CHECK-LABEL: loop:
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; CHECK: %val = load i32, i32* %ptr
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; ALIAS-N2-LABEL: @test3(
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; ALIAS-N2-LABEL: entry:
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; ALIAS-N2-LABEL: loop:
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; ALIAS-N2: %val = load i32, i32* %ptr
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entry:
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br label %loop
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loop:
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%x = phi i32 [ 0, %entry ], [ %x.inc, %loop ]
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call void @foo(i64 4, i32* %ptr)
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%val = load i32, i32* %ptr
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%x.inc = add i32 %x, %val
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br label %loop
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}
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