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| author | Chris Lattner <sabre@nondot.org> | 2012-03-13 18:07:41 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2012-03-13 18:07:41 +0000 |
| commit | 5161de6ebbd36b0532bd980483d757f5a3014611 (patch) | |
| tree | 992cc65d08d6b91c15445b8d3e86d60825420cdb /test/Transforms/JumpThreading | |
| parent | f1ce79f3c359bf33c2f30a74625a9babc3cc2a48 (diff) | |
| download | external_llvm-5161de6ebbd36b0532bd980483d757f5a3014611.zip external_llvm-5161de6ebbd36b0532bd980483d757f5a3014611.tar.gz external_llvm-5161de6ebbd36b0532bd980483d757f5a3014611.tar.bz2 | |
enhance jump threading to preserve TBAA information when PRE'ing loads,
fixing rdar://11039258, an issue that came up when inspecting clang's
bootstrapped codegen.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152635 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/JumpThreading')
| -rw-r--r-- | test/Transforms/JumpThreading/thread-loads.ll | 48 |
1 files changed, 44 insertions, 4 deletions
diff --git a/test/Transforms/JumpThreading/thread-loads.ll b/test/Transforms/JumpThreading/thread-loads.ll index cce23ea..78d36e7 100644 --- a/test/Transforms/JumpThreading/thread-loads.ll +++ b/test/Transforms/JumpThreading/thread-loads.ll @@ -1,12 +1,12 @@ ; RUN: opt < %s -jump-threading -S | FileCheck %s -; rdar://6402033 -; Test that we can thread through the block with the partially redundant load (%2). target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128" target triple = "i386-apple-darwin7" -define i32 @foo(i32* %P) nounwind { -; CHECK: foo +; Test that we can thread through the block with the partially redundant load (%2). +; rdar://6402033 +define i32 @test1(i32* %P) nounwind { +; CHECK: @test1 entry: %0 = tail call i32 (...)* @f1() nounwind ; <i32> [#uses=1] %1 = icmp eq i32 %0, 0 ; <i1> [#uses=1] @@ -39,3 +39,43 @@ bb3: ; preds = %bb1 declare i32 @f1(...) declare i32 @f2(...) + + +;; Check that we preserve TBAA information. +; rdar://11039258 + +define i32 @test2(i32* %P) nounwind { +; CHECK: @test2 +entry: + %0 = tail call i32 (...)* @f1() nounwind ; <i32> [#uses=1] + %1 = icmp eq i32 %0, 0 ; <i1> [#uses=1] + br i1 %1, label %bb1, label %bb + +bb: ; preds = %entry +; CHECK: bb1.thread: +; CHECK: store{{.*}}, !tbaa !0 +; CHECK: br label %bb3 + store i32 42, i32* %P, align 4, !tbaa !0 + br label %bb1 + +bb1: ; preds = %entry, %bb + %res.0 = phi i32 [ 1, %bb ], [ 0, %entry ] + %2 = load i32* %P, align 4, !tbaa !0 + %3 = icmp sgt i32 %2, 36 + br i1 %3, label %bb3, label %bb2 + +bb2: ; preds = %bb1 + %4 = tail call i32 (...)* @f2() nounwind + ret i32 %res.0 + +bb3: ; preds = %bb1 +; CHECK: bb3: +; CHECK: %res.01 = phi i32 [ 1, %bb1.thread ], [ 0, %bb1 ] +; CHECK: ret i32 %res.01 + ret i32 %res.0 +} + +!0 = metadata !{metadata !"int", metadata !1} +!1 = metadata !{metadata !"omnipotent char", metadata !2} +!2 = metadata !{metadata !"Simple C/C++ TBAA", null} + |