diff options
Diffstat (limited to 'test/Transforms/SROA/phi-and-select.ll')
-rw-r--r-- | test/Transforms/SROA/phi-and-select.ll | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/test/Transforms/SROA/phi-and-select.ll b/test/Transforms/SROA/phi-and-select.ll index d95e48f303..921016a9c2 100644 --- a/test/Transforms/SROA/phi-and-select.ll +++ b/test/Transforms/SROA/phi-and-select.ll @@ -390,3 +390,38 @@ if.then: %tmpcast.d.0 = select i1 undef, i32* %c, i32* %d.0 br label %for.cond } + +define i64 @PR14132(i1 %flag) { +; CHECK: @PR14132 +; Here we form a PHI-node by promoting the pointer alloca first, and then in +; order to promote the other two allocas, we speculate the load of the +; now-phi-node-pointer. In doing so we end up loading a 64-bit value from an i8 +; alloca, which is completely bogus. However, we were asserting on trying to +; rewrite it. Now it is replaced with undef. Eventually we may replace it with +; unrechable and even the CFG will go away here. +entry: + %a = alloca i64 + %b = alloca i8 + %ptr = alloca i64* +; CHECK-NOT: alloca + + %ptr.cast = bitcast i64** %ptr to i8** + store i64 0, i64* %a + store i8 1, i8* %b + store i64* %a, i64** %ptr + br i1 %flag, label %if.then, label %if.end + +if.then: + store i8* %b, i8** %ptr.cast + br label %if.end + +if.end: + %tmp = load i64** %ptr + %result = load i64* %tmp +; CHECK-NOT: store +; CHECK-NOT: load +; CHECK: %[[result:.*]] = phi i64 [ undef, %if.then ], [ 0, %entry ] + + ret i64 %result +; CHECK-NEXT: ret i64 %[[result]] +} |