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cf2951e884
Summary: The idea is very close to what we do for assume intrinsics: we mark the guard intrinsics as writing to arbitrary memory to maintain control dependence, but under the covers we teach AA that they do not mod any particular memory location. Reviewers: chandlerc, hfinkel, gbiv, reames Subscribers: george.burgess.iv, mcrosier, llvm-commits Differential Revision: http://reviews.llvm.org/D19575 llvm-svn: 269007
31 lines
1.9 KiB
LLVM
31 lines
1.9 KiB
LLVM
; RUN: opt < %s -basicaa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
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target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:32:64-v128:32:128-a0:0:32-n32"
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) #0
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declare void @llvm.experimental.guard(i1, ...)
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declare void @unknown_but_readonly() readonly
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define void @test1(i8* %P, i8* %Q) {
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tail call void(i1,...) @llvm.experimental.guard(i1 true) [ "deopt"() ]
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tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %P, i8* %Q, i64 12, i32 1, i1 false)
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ret void
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; CHECK-LABEL: Function: test1:
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; CHECK: Just Ref: Ptr: i8* %P <-> tail call void (i1, ...) @llvm.experimental.guard(i1 true) [ "deopt"() ]
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; CHECK: Just Ref: Ptr: i8* %Q <-> tail call void (i1, ...) @llvm.experimental.guard(i1 true) [ "deopt"() ]
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; CHECK: Both ModRef: Ptr: i8* %P <-> tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %P, i8* %Q, i64 12, i32 1, i1 false)
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; CHECK: Both ModRef: Ptr: i8* %Q <-> tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %P, i8* %Q, i64 12, i32 1, i1 false)
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; CHECK: Just Ref: tail call void (i1, ...) @llvm.experimental.guard(i1 true) [ "deopt"() ] <-> tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %P, i8* %Q, i64 12, i32 1, i1 false)
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; CHECK: Just Mod: tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %P, i8* %Q, i64 12, i32 1, i1 false) <-> tail call void (i1, ...) @llvm.experimental.guard(i1 true) [ "deopt"() ]
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}
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define void @test2() {
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tail call void(i1,...) @llvm.experimental.guard(i1 true) [ "deopt"() ]
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tail call void @unknown_but_readonly()
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ret void
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; CHECK-LABEL: Function: test2:
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; CHECK: NoModRef: tail call void (i1, ...) @llvm.experimental.guard(i1 true) [ "deopt"() ] <-> tail call void @unknown_but_readonly()
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; CHECK: NoModRef: tail call void @unknown_but_readonly() <-> tail call void (i1, ...) @llvm.experimental.guard(i1 true) [ "deopt"() ]
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}
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