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| author | Sanjoy Das <sanjoy@playingwithpointers.com> | 2016-05-10 02:35:41 +0000 |
|---|---|---|
| committer | Sanjoy Das <sanjoy@playingwithpointers.com> | 2016-05-10 02:35:41 +0000 |
| commit | bbd902f57e2477b3bb26e379a384339fbe03a01f (patch) | |
| tree | 4005927876534cf79224e448db3a139242906651 /test/Analysis/BasicAA | |
| parent | 3c559a044a092ec6cb1190056b2d5e3b17185963 (diff) | |
[BasicAA] Guard intrinsics don't write to memory
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
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@269007 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Analysis/BasicAA')
| -rw-r--r-- | test/Analysis/BasicAA/guards.ll | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/test/Analysis/BasicAA/guards.ll b/test/Analysis/BasicAA/guards.ll new file mode 100644 index 00000000000..66cfb156b7d --- /dev/null +++ b/test/Analysis/BasicAA/guards.ll @@ -0,0 +1,30 @@ +; RUN: opt < %s -basicaa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s +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" + +declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) #0 +declare void @llvm.experimental.guard(i1, ...) +declare void @unknown_but_readonly() readonly + +define void @test1(i8* %P, i8* %Q) { + 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) + ret void + +; CHECK-LABEL: Function: test1: + +; CHECK: Just Ref: Ptr: i8* %P <-> tail call void (i1, ...) @llvm.experimental.guard(i1 true) [ "deopt"() ] +; CHECK: Just Ref: Ptr: i8* %Q <-> tail call void (i1, ...) @llvm.experimental.guard(i1 true) [ "deopt"() ] +; CHECK: Both ModRef: Ptr: i8* %P <-> tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %P, i8* %Q, i64 12, i32 1, i1 false) +; CHECK: Both ModRef: Ptr: i8* %Q <-> tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %P, i8* %Q, i64 12, i32 1, i1 false) +; 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) +; 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"() ] +} + +define void @test2() { + tail call void(i1,...) @llvm.experimental.guard(i1 true) [ "deopt"() ] + tail call void @unknown_but_readonly() + ret void +; CHECK-LABEL: Function: test2: +; CHECK: NoModRef: tail call void (i1, ...) @llvm.experimental.guard(i1 true) [ "deopt"() ] <-> tail call void @unknown_but_readonly() +; CHECK: NoModRef: tail call void @unknown_but_readonly() <-> tail call void (i1, ...) @llvm.experimental.guard(i1 true) [ "deopt"() ] +} |