| # RUN: llc -mtriple=x86_64-- %s -o - -run-pass=simple-register-coalescing | FileCheck %s |
| --- |
| name: f |
| body: | |
| bb.0: |
| JB_1 %bb.2, undef implicit killed %eflags |
| JMP_1 %bb.1 |
| |
| bb.1: |
| %0 : gr64 = IMPLICIT_DEF |
| NOOP implicit-def undef %1.sub_32bit : gr64 |
| NOOP implicit-def %1.sub_16bit : gr64 |
| JMP_1 %bb.3 |
| |
| bb.2: |
| NOOP implicit-def %0 |
| %1 = COPY %0 |
| |
| bb.3: |
| NOOP implicit killed %0 |
| NOOP implicit killed %1 |
| ... |
| |
| # We should have a setting of both sub_32bit and sub_16bit. The first one |
| # should be undef and not dead, and the second should not be undef. |
| |
| # CHECK-NOT: dead |
| # CHECK: NOOP implicit-def undef %1.sub_32bit |
| # CHECK-NOT: undef |
| # CHECK-NEXT: NOOP implicit-def %1.sub_16bit |
