https://bugs.llvm.org/show_bug.cgi?id=52465
Bug ID: 52465
Summary: LowerSwich pass asserts on 128-bit switch case value
Product: libraries
Version: 13.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Transformation Utilities
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Created attachment 25434
--> https://bugs.llvm.org/attachment.cgi?id=25434&action=edit
Assert backtrace
When a switch case with a 128-bit value is present in the IR, the LowerSwitch
pass triggers the following assert (backtrace attached):
int64_t llvm::APInt::getSExtValue() const: Assertion `getMinSignedBits() <= 64
&& "Too many bits for int64_t"' failed.
This behavior was observed applying the pass on IR generated by the Rust
compiler, but to simplify reproduction, i've attached a simple C code (and its
IR code) which reproduce the issue as well.
The bitcode is generated with:
clang -O0 -Xclang -disable-O0-optnone -emit-llvm -c switch.c -o switch.bc
The LowerSwitch pass is applied with:
opt -lowerswitch switch.bc -o out.bc
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