| # RUN: llc -o - -mtriple=x86_64-- -run-pass=regallocfast %s | FileCheck %s |
| # Fast regalloc used to not collect physical register definitions |
| # before walking and assigning the virtual definition. |
| # Therefore it was possible for a virtual definition to end up |
| # using the same register as a later (in terms of operand list) physical |
| # register. |
| # Check this does not happen. |
| # |
| # PR41790 |
| --- |
| name: instruction_with_1virtreg_1physreg_defs |
| tracksRegLiveness: true |
| body: | |
| bb.0: |
| ; CHECK-NOT: $rax = KILL implicit-def dead $rax |
| %0:gr64 = KILL implicit-def dead $rax |
| KILL killed %0 |
| RET 0 |
| ... |
