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| author | Manman Ren <mren@apple.com> | 2013-03-18 21:23:25 +0000 |
|---|---|---|
| committer | Manman Ren <mren@apple.com> | 2013-03-18 21:23:25 +0000 |
| commit | 90842427b2f6ab5c0aab6049fd9177033101847f (patch) | |
| tree | 5510ceb24e7918b1f8246563252070b11f3473cf /test/Transforms/InstSimplify | |
| parent | 02fec34de127d23987352b90bf095ad3fac75fb9 (diff) | |
| download | external_llvm-90842427b2f6ab5c0aab6049fd9177033101847f.zip external_llvm-90842427b2f6ab5c0aab6049fd9177033101847f.tar.gz external_llvm-90842427b2f6ab5c0aab6049fd9177033101847f.tar.bz2 | |
Check whether a pointer is non-null (isKnownNonNull) in isKnownNonZero.
This handles the case where we have an inbounds GEP with alloca as the pointer.
This fixes the regression in PR12750 and rdar://13286434.
Note that we can also fix this by handling some GEP cases in isKnownNonNull.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177321 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/InstSimplify')
| -rw-r--r-- | test/Transforms/InstSimplify/compare.ll | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/test/Transforms/InstSimplify/compare.ll b/test/Transforms/InstSimplify/compare.ll index 0ecfb1f..b764c76 100644 --- a/test/Transforms/InstSimplify/compare.ll +++ b/test/Transforms/InstSimplify/compare.ll @@ -682,3 +682,14 @@ define zeroext i1 @external_compare(i32* noalias %x) { ; CHECK: external_compare ; CHECK: ret i1 %cmp } + +define i1 @alloca_gep(i64 %a, i64 %b) { +; CHECK: @alloca_gep +; We can prove this GEP is non-null because it is inbounds and the pointer +; is non-null. + %strs = alloca [1000 x [1001 x i8]], align 16 + %x = getelementptr inbounds [1000 x [1001 x i8]]* %strs, i64 0, i64 %a, i64 %b + %cmp = icmp eq i8* %x, null + ret i1 %cmp +; CHECK-NEXT: ret i1 false +} |