61d4b342d1
This one is weird... globals-aa needs to be already computed at licm, or else a function pass can't run a module analysis and won't have access to globals-aa. But the globals-aa result is impacted by instcombine in a way that affects what the test is expecting. If globals-aa is computed before instcombine, it is cached and globals-aa used in licm won't contain the necessary info provided by instcombine. Another catch is that if we don't invalidate AAManager, it will use the cached AAManager that instcombine requested, which may not contain globals-aa. So we have to invalidate<aa> so that licm can recompute an AAManager with the globals-aa created by the require<globals-aa>. This is essentially the problem described in https://reviews.llvm.org/D84259. Reviewed By: asbirlea Differential Revision: https://reviews.llvm.org/D88118
56 lines
1.7 KiB
LLVM
56 lines
1.7 KiB
LLVM
; RUN: opt < %s -instcombine -globals-aa -licm -enable-new-pm=0 -S | FileCheck %s
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; RUN: opt < %s -aa-pipeline=basic-aa,globals-aa -passes='function(instcombine),require<globals-aa>,function(invalidate<aa>,loop(licm))' -S | FileCheck %s
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; Make sure -globals-aa ignores dead uses of globals.
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@a = internal global i32 0, align 4
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@c = common global i32 0, align 4
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; Function Attrs: nounwind
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define i32 @g() {
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; Make sure the load of @a is hoisted.
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; CHECK-LABEL: define i32 @g()
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; CHECK: entry:
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; CHECK-NEXT: load i32, i32* @a, align 4
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; CHECK-NEXT: br label %for.cond
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entry:
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br label %for.cond
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for.cond: ; preds = %for.inc, %entry
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%i.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
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%sum.0 = phi i32 [ 0, %entry ], [ %add, %for.inc ]
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%cmp = icmp slt i32 %i.0, 1000
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br i1 %cmp, label %for.body, label %for.end
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for.body: ; preds = %for.cond
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%0 = load i32, i32* @a, align 4
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%add = add nsw i32 %sum.0, %0
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call void @f()
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br label %for.inc
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for.inc: ; preds = %for.body
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%inc = add nsw i32 %i.0, 1
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br label %for.cond
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for.end: ; preds = %for.cond
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ret i32 %sum.0
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}
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; Function Attrs: nounwind
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define internal void @f() {
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entry:
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%tobool = icmp ne i32 0, 0
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br i1 %tobool, label %if.then, label %if.end
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if.then: ; preds = %entry
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store i32 ptrtoint (i32* @a to i32), i32* @c, align 4
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br label %if.end
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if.end: ; preds = %if.then, %entry
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%0 = load i32, i32* @c, align 4
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%inc = add nsw i32 %0, 1
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store i32 %inc, i32* @c, align 4
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ret void
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}
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