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Please see include/llvm/Transforms/Utils/MemorySSA.h for a description of MemorySSA, and what it does. Differential Revision: http://reviews.llvm.org/D7864 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@259595 91177308-0d34-0410-b5e6-96231b3b80d8
27 lines
609 B
LLVM
27 lines
609 B
LLVM
; RUN: opt -basicaa -print-memoryssa -verify-memoryssa -analyze < %s 2>&1 | FileCheck %s
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;
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; Ensuring that external functions without attributes are MemoryDefs
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@g = external global i32
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declare void @modifyG()
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define i32 @foo() {
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; CHECK: MemoryUse(liveOnEntry)
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; CHECK-NEXT: %1 = load i32
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%1 = load i32, i32* @g
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; CHECK: 1 = MemoryDef(liveOnEntry)
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; CHECK-NEXT: store i32 4
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store i32 4, i32* @g, align 4
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; CHECK: 2 = MemoryDef(1)
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; CHECK-NEXT: call void @modifyG()
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call void @modifyG()
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; CHECK: MemoryUse(2)
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; CHECK-NEXT: %2 = load i32
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%2 = load i32, i32* @g
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%3 = add i32 %2, %1
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ret i32 %3
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}
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