https://bugs.llvm.org/show_bug.cgi?id=47783
Bug ID: 47783
Summary: unable to legalize instruction: G_BRJT
Product: libraries
Version: trunk
Hardware: PC
URL: https://godbolt.org/z/hGMqWK
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: GlobalISel
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Created attachment 24039
--> https://bugs.llvm.org/attachment.cgi?id=24039&action=edit
simplified reproducer
Hi,
Yesterday, at the LLVM conference, somebody mentioned that he recommends
GlobalIsel for JIT workloads (but I think their experience was for GPUs, so not
really comparable). So I quickly tried enabling it for Postgres' JIT, on X86.
Immediately triggered:
LLVM ERROR: unable to legalize instruction: G_BRJT %39:_(p0), %jump-table.0,
%38:_(s64) (in function: deform_29_1)
Using bugpoint and some further manual work I created a fairly small
reproducer:
https://godbolt.org/z/Wxvdzs (also attached)
Regards,
Andres
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