https://bugs.llvm.org/show_bug.cgi?id=33677
Bug ID: 33677
Summary: after fast regalloc: *** Bad machine code: Using an
undefined physical register ***
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Register Allocator
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Created attachment 18744
--> https://bugs.llvm.org/attachment.cgi?id=18744&action=edit
reduced testcase
bin/llc -verify-machineinstrs -regalloc=fast
BB#6:
Predecessors according to CFG: BB#3
%vreg9:subreg_hl32<def> = COPY %vreg9:subreg_l32; GR128Bit:%vreg9
%vreg17<def> = COPY %vreg9:subreg_l64; GR64Bit:%vreg17 GR128Bit:%vreg9
J <BB#5>
Successors according to CFG: BB#5(?%)
->
# After Fast Register Allocator
BB#6:
Predecessors according to CFG: BB#3
%R0Q<def> = L128 <fi#0>, 0, %noreg; mem:LD16[FixedStack0](align=8)
%R0L<def> = COPY %R1L, %R0Q<imp-use,kill>
%R2D<def> = COPY %R1D
ST128 %R0Q<kill>, <fi#0>, 0, %noreg; mem:ST16[FixedStack0](align=8)
STG %R2D<kill>, <fi#1>, 0, %noreg; mem:ST8[FixedStack1]
J <BB#5>
Successors according to CFG: BB#5(?%)
*** Bad machine code: Using an undefined physical register ***
- function: main
- basic block: BB#6 (0x432b5cb0)
- instruction: %R2D<def> = COPY
- operand 1: %R1D
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