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| author | George Burgess IV <george.burgess.iv@gmail.com> | 2017-07-12 16:30:37 +0000 |
|---|---|---|
| committer | George Burgess IV <george.burgess.iv@gmail.com> | 2017-07-12 16:30:37 +0000 |
| commit | 6f92d2dd24b03e26496bf59fea108ee16c18d28f (patch) | |
| tree | 33562b46982bb754c11deef7c051c369865cd3ff /llvm/test/Transforms/CodeGenPrepare/crash-on-large-allocas.ll | |
| parent | 98a6b3ea87152728f2e4e513fe05d629b722e4e0 (diff) | |
| download | bcm5719-llvm-6f92d2dd24b03e26496bf59fea108ee16c18d28f.tar.gz bcm5719-llvm-6f92d2dd24b03e26496bf59fea108ee16c18d28f.zip | |
Add a test for r307754
As promised in D35003.
Uses -codegenprepare instead of -instcombine since we hit the same
buggy path anyway, and CGP lets us keep this test really simple
(instcombine likes turning the alloca T, N into alloca [N x T], which
hides the bug this is testing for).
llvm-svn: 307811
Diffstat (limited to 'llvm/test/Transforms/CodeGenPrepare/crash-on-large-allocas.ll')
| -rw-r--r-- | llvm/test/Transforms/CodeGenPrepare/crash-on-large-allocas.ll | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/llvm/test/Transforms/CodeGenPrepare/crash-on-large-allocas.ll b/llvm/test/Transforms/CodeGenPrepare/crash-on-large-allocas.ll new file mode 100644 index 00000000000..3808c0e61c1 --- /dev/null +++ b/llvm/test/Transforms/CodeGenPrepare/crash-on-large-allocas.ll @@ -0,0 +1,16 @@ +; RUN: opt -S -codegenprepare %s -o - | FileCheck %s +; +; Ensure that we don't {crash,return a bad value} when given an alloca larger +; than what a pointer can represent. + +target datalayout = "p:16:16" + +; CHECK-LABEL: @alloca_overflow_is_unknown( +define i16 @alloca_overflow_is_unknown() { + %i = alloca i8, i32 65537 + %j = call i16 @llvm.objectsize.i16.p0i8(i8* %i, i1 false, i1 false) + ; CHECK: ret i16 -1 + ret i16 %j +} + +declare i16 @llvm.objectsize.i16.p0i8(i8*, i1, i1) |
