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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
43 lines
1.3 KiB
LLVM
43 lines
1.3 KiB
LLVM
; RUN: opt -passes='loop(loop-instsimplify,simplify-cfg,unswitch),verify<loops>' -S < %s | FileCheck %s
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; RUN: opt -verify-memoryssa -passes='loop-mssa(loop-instsimplify,simplify-cfg,unswitch),verify<loops>' -S < %s | FileCheck %s
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declare void @some_func() noreturn
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define i32 @test1(i32* %var, i1 %cond1, i1 %cond2) {
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; CHECK-LABEL: @test1(
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entry:
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br label %loop_begin
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 %{{.*}}, label %entry.split, label %loop_exit.split
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;
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; CHECK: entry.split:
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; CHECK-NEXT: br i1 %{{.*}}, label %entry.split.split, label %loop_exit
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;
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; CHECK: entry.split.split:
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; CHECK-NEXT: br label %loop_begin
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loop_begin:
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br i1 %cond1, label %continue, label %loop_exit ; first trivial condition
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continue:
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%var_val = load i32, i32* %var
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%var_cond = trunc i32 %var_val to i1
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%maybe_cond = select i1 %cond1, i1 %cond2, i1 %var_cond
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br i1 %maybe_cond, label %do_something, label %loop_exit ; second trivial condition
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do_something:
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call void @some_func() noreturn nounwind
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br label %loop_begin
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; CHECK: loop_begin:
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; CHECK-NEXT: call
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; CHECK-NEXT: br label %loop_begin
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loop_exit:
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ret i32 0
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; CHECK: loop_exit:
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; CHECK-NEXT: br label %loop_exit.split
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;
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; CHECK: loop_exit.split:
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; CHECK-NEXT: ret
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}
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