https://bugs.llvm.org/show_bug.cgi?id=51777
Bug ID: 51777
Summary: Hang on thumbv6 code with 64-bit wide integers
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: ARM
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected]
There is this regression between LLVM 8 and LLVM 9 where on the older version
the code compiles fine and on the later it will run indefinitely.
Here's the LLVM-IR:
```
target triple = "thumbv6em-none-unknown-eabihf"
define i64 @func(i64 %arg) {
start:
%0 = add i64 %arg, 1
%1 = icmp ult i64 %0, 1 ; only `ult` can be used here fwr
%2 = select i1 %1, i64 8, i64 0 ; 8 must be a power of 2
ret i64 %2
}
```
Here's a godbolt link: https://llvm.godbolt.org/z/6Ghefnesr
Does work on thumbv7, but not of any of the thumbv6 architectures.
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