https://llvm.org/bugs/show_bug.cgi?id=27331
Bug ID: 27331
Summary: LiveRange not updated correctly in RegisterCoalescer
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Register Allocator
Assignee: unassignedb...@nondot.org
Reporter: tstel...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 16213
--> https://llvm.org/bugs/attachment.cgi?id=16213&action=edit
Failing test case
Compiling the attached test case results in a verifier error. Command ot
reproduce:
llc -mtriple=amdgcn--amdhsa -mcpu=fiji coalescer-bug.ll -verify-machineinstrs
-o -
qcolombet helped be debug this on IRC, and it appears the problem is that the
live range information is not updated correctly during this transformation:
**BEFORE**
%vreg23 = 0
%vreg24:sub0 = %vreg23
%vreg24:sub1 = 2146435072
USE %vreg24
%vreg80:sub0 = %vreg23
%vreg80:sub1 = 1076494336
USE %vreg80
**AFTER**
%vreg80:sub0 = 0
%vreg80:sub1 = 2146435072
USE %vreg80
%vreg80:sub1 = 1076494336
USE %vreg80
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