https://bugs.llvm.org/show_bug.cgi?id=43467
Bug ID: 43467
Summary: handleMoveUp fails to properly update main range when
subregister def moved across another subregister def
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Common Code Generator Code
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Created attachment 22579
--> https://bugs.llvm.org/attachment.cgi?id=22579&action=edit
Patch adding failing tests
./unittests/MI/MITests --gtest_filter=LiveIntervalTest.TestMoveSubRegNotCovered
********** INTERVALS **********
%1 [16r,32B:1)[32B,56r:3)[56r,64r:0)[80r,144B:2) 0@56r 1@16r 2@80r 3@32B-phi
L00000001 [16r,32B:1)[32B,64r:2)[80r,144B:0) 0@80r 1@16r 2@32B-phi L00000002
[16r,16d:1)[56r,112r:0) 0@56r 1@16r weight:0.000000e+00
%2 [48r,80r:0) 0@48r weight:0.000000e+00
%3 [64r,64d:0) 0@64r weight:0.000000e+00
RegMasks:
********** MACHINEINSTRS **********
# Machine code for function func: NoPHIs
0B bb.0:
successors: %bb.1(0x80000000); %bb.1(100.00%)
16B %1:vreg_64 = IMPLICIT_DEF
32B bb.1:
; predecessors: %bb.0, %bb.1
successors: %bb.1(0x80000000); %bb.1(100.00%)
48B %2:vgpr_32 = V_MOV_B32_e32 2, implicit $exec
56B %1.sub1:vreg_64 = COPY %2:vgpr_32
64B dead %3:vgpr_32 = V_ADD_U32_e32 %2:vgpr_32, %1.sub0:vreg_64, implicit
$exec
80B %1.sub0:vreg_64 = V_ADD_U32_e32 %2:vgpr_32, %2:vgpr_32, implicit
$exec
112B S_NOP 0, implicit %1.sub1:vreg_64
128B S_BRANCH %bb.1
# End machine code for function func.
*** Bad machine code: A Subrange is not covered by the main range ***
- function: func
- interval: %1 [16r,32B:1)[32B,56r:3)[56r,64r:0)[80r,144B:2) 0@56r 1@16r
2@80r 3@32B-phi L00000001 [16r,32B:1)[32B,64r:2)[80r,144B:0) 0@80r 1@16r
2@32B-phi L00000002 [16r,16d:1)[56r,112r:0) 0@56r 1@16r weight:0.000000e+00
LLVM ERROR: Found 1 machine code errors.
Attached is a patch adding the original test case, and 2 variants of reduced
unit tests.
This subreg def is moved up across another subregister use and def.
%1.sub1:vreg_64 = COPY %2
The computed main range is incorrect at [56r,64r:0). This ends an instruction
too early, and should reach 80r since the def in the second add counts as a use
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