https://bugs.llvm.org/show_bug.cgi?id=42405
Bug ID: 42405
Summary: [ARM] SCE optimization pass hoisting DIV operation
outside of is-else BB as a speculative execution
Product: tools
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: llc
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Created attachment 22144
--> https://bugs.llvm.org/attachment.cgi?id=22144&action=edit
reproducer mir file
Attached is an MIR test (reproducer.mir) that shows a case where the original
sequence performs the DIV operation only if the divisor is not 0. But after
running MachineCSE pass we can see that the DIV was hoisted outside of the
if-else BBs, what would result in an integer division by zero.
The command line for running the pass is:
llc -mtriple=aarch64-none-linux-gnu -run-pass=machine-cse -asm-verbose=1
-verify-machineinstrs reproducer.mir -o after-pass
Most likely that this bug was introduced in: https://reviews.llvm.org/rL362901.
Owner of the change is already investigating the issue.
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