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[BasicAA] Treat llvm.assume as not accessing memory in getModRefBehav…
…ior(Function) Reviewers: dberlin, chandlerc, hfinkel, reames, sanjoy Subscribers: mcrosier, llvm-commits Differential Revision: http://reviews.llvm.org/D19730 llvm-svn: 268068
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; RUN: opt -basicaa -print-memoryssa -verify-memoryssa -analyze < %s 2>&1 | FileCheck %s | ||
; | ||
; Ensures that assumes are treated as not reading or writing memory. | ||
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declare void @llvm.assume(i1) | ||
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define i32 @foo(i32* %a, i32* %b, i1 %c) { | ||
; CHECK: 1 = MemoryDef(liveOnEntry) | ||
; CHECK-NEXT: store i32 4 | ||
store i32 4, i32* %a, align 4 | ||
; CHECK: call void @llvm.assume | ||
call void @llvm.assume(i1 %c) | ||
; CHECK: MemoryUse(1) | ||
; CHECK-NEXT: %1 = load i32 | ||
%1 = load i32, i32* %a, align 4 | ||
ret i32 %1 | ||
} |