| # RUN: llc -mtriple=s390x-linux-gnu -mcpu=z13 -O3 -start-before=livevars %s -o /dev/null 2>&1 |
| # Test that coalesing of an empty live range (undef) does not cause failure. |
| |
| --- | |
| define dso_local void @fun(ptr %src, ptr %dst) #0 { |
| %1 = sdiv i64 poison, poison |
| %2 = load i32, ptr %src, align 4 |
| br i1 poison, label %6, label %3 |
| |
| 3: ; preds = %0 |
| %4 = trunc i64 %1 to i32 |
| %5 = udiv i32 %4, %2 |
| br label %6 |
| |
| 6: ; preds = %3, %0 |
| %7 = phi i32 [ %5, %3 ], [ 1, %0 ] |
| store i32 %7, ptr %dst, align 4 |
| ret void |
| } |
| |
| ... |
| --- |
| name: fun |
| alignment: 16 |
| tracksRegLiveness: true |
| registers: |
| - { id: 0, class: gr64bit } |
| - { id: 1, class: gr32bit } |
| - { id: 2, class: grx32bit } |
| - { id: 3, class: grx32bit } |
| - { id: 4, class: addr64bit } |
| - { id: 5, class: addr64bit } |
| - { id: 6, class: grx32bit } |
| - { id: 7, class: grx32bit } |
| - { id: 8, class: grx32bit } |
| - { id: 9, class: gr64bit } |
| - { id: 10, class: gr64bit } |
| - { id: 11, class: gr128bit } |
| - { id: 12, class: gr128bit } |
| - { id: 13, class: gr128bit } |
| - { id: 14, class: gr128bit } |
| - { id: 15, class: gr64bit } |
| liveins: |
| - { reg: '$r2d', virtual-reg: '%4' } |
| - { reg: '$r3d', virtual-reg: '%5' } |
| frameInfo: |
| maxAlignment: 1 |
| machineFunctionInfo: {} |
| body: | |
| bb.0 (%ir-block.0): |
| liveins: $r2d, $r3d |
| |
| %5:addr64bit = COPY $r3d |
| %4:addr64bit = COPY $r2d |
| %6:grx32bit = LHIMux 1 |
| %7:grx32bit = LHIMux 0 |
| CHIMux killed %7, 0, implicit-def $cc |
| BRC 14, 6, %bb.2, implicit $cc |
| J %bb.1 |
| |
| bb.1 (%ir-block.3): |
| %1:gr32bit = LMux %4, 0, $noreg :: (load (s32) from %ir.src) |
| %15:gr64bit = LLILL 0 |
| %14:gr128bit = INSERT_SUBREG undef %13:gr128bit, %15, %subreg.subreg_h64 |
| %11:gr128bit = INSERT_SUBREG %14, undef %9:gr64bit, %subreg.subreg_l64 |
| %12:gr128bit = DLR %11, %1 |
| %2:grx32bit = COPY %12.subreg_ll32 |
| |
| bb.2 (%ir-block.6): |
| %3:grx32bit = PHI %6, %bb.0, %2, %bb.1 |
| STMux %3, %5, 0, $noreg :: (store (s32) into %ir.dst) |
| Return |
| |
| ... |
