https://bugs.llvm.org/show_bug.cgi?id=44541
Bug ID: 44541
Summary: Instcombine hangs with "opt -functionattrs
-disable-basicaa -O1"
Product: new-bugs
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: mikael.hol...@ericsson.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org
Created attachment 23015
--> https://bugs.llvm.org/attachment.cgi?id=23015&action=edit
bbi-37458_x86.ll reproducer
Running
opt -functionattrs -disable-basicaa -O1 -S -o - ./bbi-37458_x86.ll
seems to hang forever.
Adding -debug-pass=Executions shows
[2020-01-14 15:08:50.872376271] 0x611e690 Executing Pass 'Combine
redundant instructions' on Function 'test_sub3_4'...
and adding -debug gives repeated occurences of
IC: Visiting: %_tmp2687 = select i1 %1808, i16 0, i16 %_tmp2685
IC: Visiting: %1808 = icmp sgt i16 0, %_tmp2685
IC: Mod = %1808 = icmp sgt i16 0, %_tmp2685
New = %1808 = icmp slt i16 %_tmp2682, 0
IC: ADD: %_tmp2687 = select i1 %1808, i16 0, i16 %_tmp2685
IC: ADD: %1808 = icmp slt i16 %_tmp2682, 0
IC: Visiting: %1808 = icmp slt i16 %_tmp2682, 0
IC: Visiting: %_tmp2687 = select i1 %1808, i16 0, i16 %_tmp2685
I've tried to reduce the command line to some minor variation of just
opt -instcombine
but I can't seem to manage that. :/
The problem seems to be fairly old, I've seen it in builds from around late
March 2019.
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