https://bugs.llvm.org/show_bug.cgi?id=52475
Bug ID: 52475
Summary: llc crash due to large structure return
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: RISC-V
Assignee: unassignedb...@nondot.org
Reporter: tclin...@gmail.com
CC: a...@lowrisc.org, llvm-bugs@lists.llvm.org
Testcase:
define <128 x i32> @ret_split_v128i32(<128 x i32>* %x) {
%v = load <128 x i32>, <128 x i32>* %x
ret <128 x i32> %v
}
This testcase is extracted from
llvm/test/CodeGen/RISCV/rvv/fixed-vectors-calling-conv.ll
Execution command:
llc -mtriple=riscv64 -mattr=+experimental-v -riscv-v-vector-bits-min=128
-riscv-v-fixed-length-vector-lmul-max=4 -pre-RA-sched=list-burr foo.ll
--disable-machine-cse test.ll
Change schedule policy for pre-RA to list-burr and disable machine-cse.
Execution result:
Use of %2 does not have a corresponding definition on every path:
48r %3:gpr = ADDI %2:gpr, 448
LLVM ERROR: Use not jointly dominated
by defs.
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash
backtrace.
Stack dump:
...
I think this bug is that DemoteRegister copied out in return bb doesn't be
chained with DemoteRegister copied in in entry bb.
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