https://bugs.llvm.org/show_bug.cgi?id=49687
Bug ID: 49687
Summary: Infinite loop in a recursive call graph
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Created attachment 24681
--> https://bugs.llvm.org/attachment.cgi?id=24681&action=edit
Simplified IR found by bugpoint
I have a recursive call graph that is apparently entering an infinite
loop, at first I observed this when forcing inline in the optimization pipeline
but later bugpoint found a more concise pipeline that reproduces the bug.
Bugpoint found the following 'opt' invocation to enter the infinite loop:
opt -inline -simplifycfg -tailcallelim -loop-unroll
As a comparison, the original C code when compiled with GCC and the
'alwaysinline' attribute errors out, for all optimizations, with the following:
out.c: In function ‘__foo’:
out.c:252:50: error: inlining failed in call to always_inline
‘__bar’: function not inlinable
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