https://bugs.llvm.org/show_bug.cgi?id=39357
Bug ID: 39357
Summary: HotColdSplitting: Miscompile in
/SingleSource/Benchmarks/BenchmarkGame/recursive
(arm64, -Os)
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Interprocedural Optimizations
Assignee: unassignedb...@nondot.org
Reporter: v...@apple.com
CC: llvm-bugs@lists.llvm.org
Created attachment 21019
--> https://bugs.llvm.org/attachment.cgi?id=21019&action=edit
IR immediately before HotColdSplitting (-Os -g)
When compiled with -Os, this test produces the correct output on an arm64
device with a 1008KB stack size limit.
When -hot-cold-split=true is enabled, the test program overflows its stack.
Here's the relevant function:
int ack(int x, int y) {
if (x == 0) {
return y + 1;
}
return ack(x - 1, ((y | 0) ? ack(x, y - 1) : 1));
}
I've attached the IR from immediately before HotColdSplitting and immediately
after. Even though none of the blocks in the ack() function should be
identified as cold, the hot path of the function is marked cold and outlined.
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